Adjustable Reactance Patents (Class 343/750)
  • Patent number: 10424830
    Abstract: The present invention provides an omni-directional antenna element configuration having a compensated radiation pattern. Broadband antenna elements are coplanarly disposed on a suitable planar dielectric material. A single element or antenna comprises a pair of balanced fed radiating microstrip elements symmetrically disposed about the centerline of a balanced signal feed network. Additionally, a pair of pattern augmentation rods positioned on each side of and proximate to the planar dielectric material running longitudinally to the centerline axis of a balanced feed network. Disposed proximate to each radiating element are partially coplanar, frequency bandwidth expanding microstrip lines. The combination of radiating elements together with pattern augmentation rods provides a broad bandwidth omni-directional radiating element suitable for use in multi-element antenna arrays.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: September 24, 2019
    Assignee: Intel Corporation
    Inventors: Kostyantyn Semonov, Alexander Rabinovich, Bill Vassilakis
  • Patent number: 10396837
    Abstract: An electronic device includes an antenna including a ground part, a feeding part, and a radiator and a first switch interposed between the feeding part and the radiator. A signal supplied through the feeding part is transmitted through a first path, a second path, or a third path that connects the feeding part to the radiator. The first switch is configured to change a connection state of the second path and the third path, and the third path includes a variable capacitor.
    Type: Grant
    Filed: November 3, 2016
    Date of Patent: August 27, 2019
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Yong Joo Shin, Ju Ho Van, Young Ju Kim
  • Patent number: 9941746
    Abstract: Provided is a power transmitting device, a power feeding system, and a power feeding method in which power loss is cut by increasing power use efficiency and power can be supplied to a power feeding user (a power receiving device) with high power transmission efficiency. Depending on a power feeding state (e.g., resonant frequency of a power transmitting resonance coil is not the same as that of a power receiving resonance coil, or the influence of their positional relation), power transmitted from a power source portion of the power transmitting device is reflected to the power transmitting coil side by the power transmitting resonance coil. Further, a power recovering function (circulation function) for power reflected to the power transmitting device is provided to recover the power reflected to the power transmitting coil side and to reuse it for power transmission.
    Type: Grant
    Filed: July 6, 2016
    Date of Patent: April 10, 2018
    Assignee: Semiconductor Energy Laboratory Co., LTD.
    Inventor: Misako Miwa
  • Patent number: 9882272
    Abstract: A control system and method is provided for raising and lowering a vehicle antenna. The control system includes a location receiver for generating vehicle location data, an obstacle detection unit which generates an obstacle signal, an antenna, an antenna motor for raising and lowering the antenna and a control unit. The control unit controls the antenna motor as a function of the vehicle location data and the obstacle signal. The control unit compares the vehicle location signal to stored or received geofencing information defining a geofenced area, and causes the antenna motor to raise the antenna when the vehicle location corresponding to the vehicle location data is inside the geofenced area and no obstacle is detected. The control unit causes the antenna motor to lower the antenna when the vehicle location corresponding to the vehicle location data is outside the geofenced area or if an obstacle is detected.
    Type: Grant
    Filed: February 25, 2016
    Date of Patent: January 30, 2018
    Assignee: DEERE & COMPANY
    Inventors: Jan M. Wyckoff, David L. Reuter, Manuel Camacho, Jeremiah J. Johnson, Vickie L. Ellis, Brian J. Gilmore
  • Patent number: 9806400
    Abstract: An antenna structure includes a metal member, a first antenna, a second antenna, a third antenna, and a fourth antenna. A gap is defined on the metal member to divide the metal member into a first frame assembly and a second frame assembly. The first frame assembly and the second frame assembly cooperatively form a receiving space for accommodating at least one electronic element. The first antenna, the second antenna, the third antenna, and the fourth antenna are received in the receiving space. The first antenna is electronically connected to the first frame assembly of the metal member. The third antenna and the fourth antenna are both electronically connected to the second frame assembly of the metal member.
    Type: Grant
    Filed: October 23, 2014
    Date of Patent: October 31, 2017
    Assignee: Chiun Mai Communication Systems, Inc.
    Inventors: Yen-Jung Tseng, Yi-Ting Chen, Cho-Kang Hsu
  • Patent number: 9666946
    Abstract: The four element reconfigurable MIMO antenna system includes four conducting PIFA elements disposed on a top surface of a rectangular dielectric substrate. For each PIFA, an F-head portion of the PIFA defines two arms extending to a long peripheral edge of the substrate. An F-tail portion of the PIFA extends from a short peripheral edge of the substrate. A first PIFA and a second PIFA are mirror images of each other, and a third PIFA and a fourth PIFA are mirror images of each other. A meander pattern of conducting material extends from a bottom region of the F-tail portion of the PIFAs. For each PIFA, PIN/varactor diode bias circuits are disposed on the substrate's top surface, connecting to and extending away from a unique location on the F-tail portion of the PIFA, thereby creating separate radiating branches of the PIFA to achieve reconfigurability.
    Type: Grant
    Filed: November 12, 2015
    Date of Patent: May 30, 2017
    Assignee: KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS
    Inventors: Mohammad S. Sharawi, Rifaqat Hussain
  • Patent number: 9598945
    Abstract: A system for in-situ heating of a subsurface formation for the extraction of hydrocarbons in underground deposits is disclosed. The system is configured to heat the underground deposit of hydrocarbons to facilitate fluid flow and hydrocarbon recovery from the underground deposit. The system has an antenna formed from a coaxial transmission line having an annular space between the transmission line outer conductor and the inner conductor and having one or more periodic aperture arrangements along the axial length of the outer conductor. A method for in-situ heating of a subsurface formation for recovering hydrocarbons contained therein is also disclosed. The method comprises: providing an antenna in the subsurface formation; providing electromagnetic RF power to the antenna for heating at least a portion of the subsurface formation.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: March 21, 2017
    Assignee: CHEVRON U.S.A. INC.
    Inventors: Michal Okoniewski, Damir Pasalic, Pedro Vaca, Gunther Hans Dieckmann, Donald Leroy Kuehne, Miguel Vigil, Stein J. Storslett
  • Patent number: 9103864
    Abstract: In accordance with certain embodiments of the present disclosure, a cable fault detection device is described. The device includes a conformal monopole structure and a ground plane structure. The ground plane structure is configured to be generally parallel to the cable longitudinal axis.
    Type: Grant
    Filed: July 6, 2011
    Date of Patent: August 11, 2015
    Assignee: University of South Carolina
    Inventors: Mohamod Ali, Rashed H. Bhuiyan, Rogor Dougal, Md Nazmul Alam
  • Publication number: 20150116170
    Abstract: A system that incorporates the subject disclosure may include, for example, a circuit for measuring a change in reactance of an antenna, determining a frequency offset of the antenna based on a change in an operating frequency of the antenna according to the change in reactance of the antenna, and adjusting the operating frequency of the antenna to mitigate the frequency offset of the antenna. Other embodiments are disclosed.
    Type: Application
    Filed: May 22, 2014
    Publication date: April 30, 2015
    Applicant: Skycross, Inc.
    Inventor: Frank M. Caimi
  • Publication number: 20150109176
    Abstract: An antenna circuit is having an impedance circuit which can cancel signal leakage from the input port into the isolation port of a directional coupler. The antenna circuit further comprises a second impedance circuit for optimising power transfer from the input port to the output port of the directional coupler. Furthermore, the antenna is tunable in order to maximize the reception strength of the antenna. The antenna circuit provides at once the possibility of tuning the antenna strength, optimising the power transmission and reducing signal jamming by cancelling signal leakage. The antenna finds use as an effective and miniature RFID antenna.
    Type: Application
    Filed: October 21, 2013
    Publication date: April 23, 2015
    Applicant: Hong Kong Applied Science and Technology Research Institute Co. Ltd.
    Inventors: Tak Ki WAN, Yan LIU, Song HE, Dan YANG, Chi Keung Angus MAK
  • Publication number: 20150097742
    Abstract: An antenna assembly is mountable to a craft. The craft has a power source. The antenna assembly includes a base securable to the craft. A monopole post extends out from the base. A plurality of voltage lines extend through the base and the monopole post. The antenna assembly also includes a plurality of capacitors operatively connected to the monopole post. Each of the capacitors is electrically connected to each of the plurality of voltage lines. The plurality of capacitors extend through serpentine paths distributing electrical charge across the plurality of capacitors to vary reactance properties of the antenna assembly.
    Type: Application
    Filed: October 3, 2013
    Publication date: April 9, 2015
    Applicant: Lockheed Martin Corporation
    Inventor: Tommy H. Lam
  • Publication number: 20150091766
    Abstract: A broadband capacitively-loaded tunable antenna, and device there for is provided. The device comprises: an antenna feed; a first radiating arm connected to the antenna feed; a second radiating arm capacitively coupled to the first radiating arm; an adjustable reactance device connecting the second radiating arm to one or more of a ground and a third radiating arm; and, a processor in communication with the adjustable reactance device, the processor configured to adjust a reactance of the adjustable reactance device to tune a resonance frequency of a combination of the second radiating arm, the adjustable reactance device, and, when present, the third radiating arm.
    Type: Application
    Filed: September 27, 2013
    Publication date: April 2, 2015
    Applicant: BLACKBERRY LIMITED
    Inventors: Shirook M. ALI, Dong WANG
  • Publication number: 20150054701
    Abstract: An electronic device including a processor and an antenna device is provided. The antenna device includes a power feeding unit, a first radiation section connected to the power feeding unit, and a switching element including a first terminal electrically connected to first portion of the first radiation section, and a second terminal electrically connected to a second portion of the first radiation section. The processor uses a first resonance frequency band when the switching element is opened and uses a second resonance frequency which is different from the first when the switching element is closed.
    Type: Application
    Filed: August 22, 2014
    Publication date: February 26, 2015
    Inventors: Kyung-Gu KIM, Gyu-Sub KIM, Young HEO, Se-Hyun PARK, Jin-Woo JUNG
  • Publication number: 20150054700
    Abstract: This antenna array includes at least one primary antenna, at least one secondary antenna and at least one load coupled to a secondary antenna. The load includes two separate components, a first component being a resistor and a second component being selected from an inductor or a capacitor. The antenna array can include one or more of the following characteristic features, taken into consideration individually or in accordance with any technically possible combinations: the first component has negative resistance; the second component has negative inductance or a negative capacitance; at least one load has an adjustable impedance. The antenna array may be used in a system, such as a vehicle, a terminal, a mobile telephone, a wireless network access point, a base station, or a radio frequency excitation probe.
    Type: Application
    Filed: August 20, 2014
    Publication date: February 26, 2015
    Inventors: Kawtar Belmkaddem, Lionel Rudant
  • Publication number: 20150009070
    Abstract: A steerable artificial impedance surface antenna steerable in phi and theta angles including a dielectric substrate, a plurality of metallic strips on a first surface of the dielectric substrate, the metallic strips spaced apart across a length of the dielectric substrate and each metallic strip extending along a width of the dielectric substrate, and surface wave feeds spaced apart along the width of the dielectric substrate near an edge of the dielectric substrate, wherein the dielectric substrate is substantially in an X-Y plane defined by an X axis and a Y axis, wherein the phi angle is an angle in the X-Y plane relative to the X axis, and wherein the theta angle is an angle relative to a Z axis orthogonal to the X-Y plane.
    Type: Application
    Filed: July 3, 2013
    Publication date: January 8, 2015
    Inventors: Daniel J. Gregoire, Joseph S. Colburn
  • Publication number: 20150002351
    Abstract: A slot antenna with a filter network is provided. The slot antenna is connectable to an antenna feed, and configured to resonate at a first frequency when surface current from the antenna feed flows around the slot antenna, the slot antenna comprising a first side and a second side separated by a width. A filter network bridges the first side and the second side, across the width, at a given position from a surface-current-originating end of slot antenna, the filter network configured to: electrically isolate the first side from the second side at the first frequency so that a length of the slot antenna defines a resonant length of the slot antenna at the first frequency; and, electrically connect the first side to the second side at a second frequency higher than the first frequency, so that the surface current flows across the filter network at the given position.
    Type: Application
    Filed: June 28, 2013
    Publication date: January 1, 2015
    Inventors: Seong Heon Jeong, David Fisk
  • Publication number: 20140368392
    Abstract: The present invention refers to a reconfigurable antenna structure. The antenna structure comprises a radiating structure comprising one or more first radiating elements and a secondary radiating structure, operationally associated with said primary radiating structure. Said secondary radiating structure comprises a plurality of second radiating elements that can be selectively electrically connected/disconnected to each other to vary the configuration of said secondary radiating structure, so as to vary the radiating properties of the antenna structure. The antenna structure also comprises first reactive loads, electrically connected between said primary and secondary radiating structures, and second reactive loads, electrically connected to said secondary radiating structure.
    Type: Application
    Filed: January 9, 2013
    Publication date: December 18, 2014
    Applicant: Adant Technologies, Inc.
    Inventors: Daniele Piazza, Mauro Facco
  • Publication number: 20140354495
    Abstract: An electronic device includes an antenna for a transceiver to operate in a plurality of frequencies. The antenna includes a first portion that is coupled to an elongate element and is configured to enable the transceiver to operate in a first low-band frequency and a first high-band frequency. A second portion is also coupled to the elongate element. The second portion is configured to enable the transceiver to operate in a second high-band frequency. A third portion is coupled to the elongate element and is situated between the first and second portions. The third portion is configured to tune the first and the second high-band frequencies associated with the first and second portions. A tuning element is configured to tune the low-band frequency associated with the first portion such that the first and the second high-band frequencies are not significantly affected by tuning the tuning element.
    Type: Application
    Filed: May 29, 2013
    Publication date: December 4, 2014
    Applicant: Motorola Solutions, Inc.
    Inventor: Guangli Yang
  • Patent number: 8903333
    Abstract: An antenna tuner provides a pass band with a transmission resonant frequency and a receive resonant frequency. In this manner, the pass band of the antenna tuner can simultaneously provide matching at both a transmission frequency and a receive frequency, when both transmission signals and receive signals are received on the same antenna. The antenna tuner includes a first capacitive element that is coupled to series resonate with the antenna and a low-pass pi network.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: December 2, 2014
    Assignee: RF Micro Devices, Inc.
    Inventor: Nadim Khlat
  • Publication number: 20140340270
    Abstract: A wireless communication device includes a cover, an antenna, and an adjusting member. The adjusting member is slidably mounted to the cover and is made of non-conductive materials. The antenna includes a extending portion, the extending portion is sandwiched between the cover and the adjusting member. The adjusting member contacts and partially overlaps with the extending portion, the adjusting member slides relative to the cover to change contact positions of the extending portion and the adjusting member.
    Type: Application
    Filed: November 20, 2013
    Publication date: November 20, 2014
    Applicant: FIH (HONG KONG) LIMITED
    Inventors: CHI-SHENG LIU, CHUAN-CHOU CHI, CHIH-YANG TSAI, PAI-CHENG HUANG
  • Patent number: 8878738
    Abstract: The tunable antenna integrated system may include a tunable antenna module, a bias module, a direct current control module, and a RF module. The tunable antenna module may include a tunable capacitor and an antenna. The tunable capacitor may have the capacitance thereof adjusted according to an adjusting voltage. A resonant frequency of the antenna is controlled by the tunable capacitor. The bias module has a digital/analog converter for receiving a control voltage to generate the adjusting voltage, and the adjusting voltage may be outputted to the tunable capacitor with the value thereof larger than that of the control voltage. The direct current control module is connected to the bias module for outputting the control voltage to the digital/analog converter. The RF module is connected to the bias module, and a RF signal is transmitted between the tunable antenna module and the RF module through the bias module.
    Type: Grant
    Filed: May 17, 2012
    Date of Patent: November 4, 2014
    Assignee: Auden Techno Corp.
    Inventors: Ching-Wei Chang, Cheng-Han Tsai, Yen-Chao Li
  • Patent number: 8872720
    Abstract: An apparatus for controlling impedance in an adaptive tuning antenna circuit is disclosed, wherein a matching unit is connected to an output terminal where a coupler outputs a coupled power of a transmission signal, a controller adjusts an impedance of the matching unit to cause the reflected power outputted by the coupler to be minimized, and the controller adjusts an impedance of a tuner to allow a combined impedance of the tuner and an antenna to be equal to the impedance of the matching unit but with opposite phases, thereby adjusting the impedance of the antenna in the optimal state.
    Type: Grant
    Filed: August 13, 2010
    Date of Patent: October 28, 2014
    Assignee: LG Innotek Co., Ltd.
    Inventor: Su Ho Bae
  • Publication number: 20140306858
    Abstract: A broadband antenna includes a grounding plane, a radiation unit which has first and second radiation components disposed adjacent to the grounding plane, and an impedance adjusting unit which is operable to adjust an impedance upon receipt of and according to a control signal. A length of a resonance path of the antenna is equal to an overall electrical length of from the first radiation component, the impedance adjusting unit, to the second terminal.
    Type: Application
    Filed: December 12, 2013
    Publication date: October 16, 2014
    Applicant: QUANTA COMPUTER INC.
    Inventors: Chin-Lung TSAI, Men-Hsueh TSAI
  • Publication number: 20140306857
    Abstract: Electronic devices may include radio-frequency transceiver circuitry and antenna structures. The antenna structures may include a dual arm inverted-F antenna resonating element and an antenna ground. An antenna feed may be coupled between the inverted-F antenna resonating element and the antenna ground. An adjustable component such as an adjustable inductor may be coupled between the inverted-F antenna resonating element and the antenna ground in parallel with the antenna feed. The adjustable component may be operable in multiple states such as an open circuit state, a short circuit state, and a state in which the adjustable component exhibits a non-zero inductance. Antenna bandwidth can be broadened by coupling a loop antenna resonating element across the antenna feed. A portion of the antenna ground may overlap the loop antenna resonating element to further enhance antenna bandwidth.
    Type: Application
    Filed: April 10, 2013
    Publication date: October 16, 2014
    Applicant: Apple Inc.
    Inventor: Apple Inc.
  • Patent number: 8847834
    Abstract: An antenna apparatus for backscattering an incoming radio frequency (RF) signal includes an antenna for backscattering the incoming RF signal in accordance with a reflection coefficient characteristic of the antenna. A variable impedance circuit includes an output electrically connected to the antenna. A band-pass delta sigma modulator is coupled to the variable impedance circuit and digitally controls the output of the variable impedance circuit, such that the reflection coefficient of the antenna is adjusted based on the digitally controlled output of the variable impedance circuit. In an RFID network, the apparatus and method reduces the effect of DC offset in the reader device and the effects of the reader device's phase noise, while allowing for complex modulations.
    Type: Grant
    Filed: May 14, 2012
    Date of Patent: September 30, 2014
    Assignee: Tag-Comm Inc.
    Inventor: Tajinder Manku
  • Patent number: 8842047
    Abstract: A portable communication device and an adjustable antenna thereof are disclosed herein. The portable communication device includes a substrate, the adjustable antenna and a control circuit. The adjustable antenna includes an antenna body, an adjusting element, a feeding terminal and a ground terminal. The antenna body has multiple conductive portions and is disposed above the substrate. The adjusting element is coupled between the conductive portions. The feeding terminal and the ground terminal extend from the antenna body and are coupled to the substrate. The control circuit feeds a first control signal and a second control signal respectively through the feeding terminal and the ground terminal to the adjusting element, so as to adjust an electrical length of the adjustable antenna.
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: September 23, 2014
    Assignee: HTC Corporation
    Inventors: Chun-Wei Tseng, Yu-Meng Yen, Ruey-Hsuan Lee, Chien-Chih Chen, Yen-Liang Kuo, Wan-Ming Chen
  • Publication number: 20140266923
    Abstract: Electronic devices may include radio-frequency transceiver circuitry and antenna structures. The antenna structures may form a dual arm inverted-F antenna and a monopole antenna sharing a common antenna ground. The antenna structures may have three ports. A first antenna port may be coupled to an inverted-F antenna resonating element at a first location and a second antenna port may be coupled to the inverted-F antenna resonating element at a second location. A third antenna port may be coupled to the monopole antenna. Tunable circuitry can be used to tune the antenna structures. An adjustable capacitor may be coupled to the first port to tune the inverted-F antenna. An additional adjustable capacitor may be coupled to the third port to tune the monopole antenna. Transceiver circuitry for supporting wireless local area network communications, satellite navigation system communications, and cellular communications may be coupled to the first, second, and third antenna ports.
    Type: Application
    Filed: March 18, 2013
    Publication date: September 18, 2014
    Applicant: Apple Inc.
    Inventors: Yijun Zhou, Nanbo Jin, Yuehui Ouyang, Enrique Ayala Vazquez, Anand Lakshmanan, Robert W. Schlub, Mattia Pascolini, Matthew A. Mow
  • Publication number: 20140266922
    Abstract: Electronic devices may be provided that contain wireless communications circuitry. The wireless communications circuitry may include radio-frequency transceiver circuitry and antenna structures. The antenna structures may form a dual arm inverted-F antenna. The antenna may have a resonating element formed from portions of a peripheral conductive electronic device housing member and may have an antenna ground that is separated from the antenna resonating element by a gap. A short circuit path may bridge the gap. An antenna feed may be coupled across the gap in parallel with the short circuit path. Low band tuning may be provided using an adjustable inductor that bridges the gap. The antenna may have a slot-based parasitic antenna resonating element with a slot formed between portions of the peripheral conductive electronic device housing member and the antenna ground. An adjustable capacitor may bridge the slot to provide high band tuning.
    Type: Application
    Filed: March 18, 2013
    Publication date: September 18, 2014
    Applicant: Apple Inc.
    Inventors: Nanbo Jin, Yuehui Ouyang, Yijun Zhou, Enrique Ayala Vazquez, Anand Lakshmanan, Robert W. Schlub, Mattia Pascolini, Matthew A. Mow
  • Patent number: 8836481
    Abstract: In a method for operating a transponder (1, 41), the transponder (1, 4) receives a signal from a transmitter (2, 42). The signal comprises an information about a reference sensitivity and the transponder (1, 41) has an input sensitivity such that the transponder (1, 41) detects only signals above a certain power corresponding to the input sensitivity. In response to the received signal, the input sensitivity of the transponder (1, 41) is adjusted to the reference sensitivity.
    Type: Grant
    Filed: December 19, 2007
    Date of Patent: September 16, 2014
    Assignee: Quotainne Enterprises LLC
    Inventor: Gerald Schaffler
  • Publication number: 20140253392
    Abstract: An electronic device may have an antenna for providing coverage in wireless communications bands of interest such as a low frequency communications band, a middle frequency communications band, and a high frequency communications band. Slot structures in the antenna that might reduce efficiency in the high frequency communications band may be avoided by capacitively loading the antenna and omitting meandering paths in the antenna. A capacitor may be coupled between an antenna ground formed from a metal housing structure and an antenna resonating element having a curved shape that conforms to the shape of the edge of the electronic device. The capacitor may have interdigitated fingers and may be adjustable to tune the antenna. The antenna may transmit and receive radio-frequency signals through a display cover layer in a display and a dielectric antenna window portion of the housing.
    Type: Application
    Filed: March 8, 2013
    Publication date: September 11, 2014
    Applicant: Apple Inc.
    Inventors: Salih Yarga, Qingxiang Li, Robert W. Schlub
  • Patent number: 8818287
    Abstract: A communication apparatus including a first antenna and performing wireless communication in which a reflected power from the first antenna changes depending on a positional relationship between the first antenna of the communication apparatus and a second antenna of a communication partner. The communication apparatus further includes a transmission unit configured to transmit a data signal to the communication partner via the first antenna, a determination unit configured to determine a reflected power generated when the transmission unit supplies the data signal to the first antenna, and a control unit configured to control the transmission of the data signal by the transmission unit, based on the reflected power determined by the determination unit.
    Type: Grant
    Filed: December 10, 2010
    Date of Patent: August 26, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Katsuo Saito
  • Publication number: 20140220906
    Abstract: According to one embodiment, an antenna apparatus comprises an antenna element connected to a feeding point, a grounded first lumped constant element connected to the antenna element, and a grounded second and third lumped constant elements connected to the antenna element through a selector. The selector is configured to connect the grounded second lumped constant element to the antenna element in order to lower a resonant frequency of the antenna element, and to connect the grounded third lumped constant element to the antenna element in order to raise the resonant frequency of the antenna element.
    Type: Application
    Filed: February 3, 2014
    Publication date: August 7, 2014
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Isao Ohba, Hiroyuki Hotta, Koichi Sato, Masao Teshima
  • Patent number: 8779982
    Abstract: A portable wireless device which effectively uses a space in a case while maintaining communication qualities by reducing antenna gain deterioration even when a plurality of antennas of different frequency bands are arranged adjacent to each other. The portable wireless device is provided with patterns for adding a band disturbing element, which is composed of beads and a parallel resonance circuit, to a part where one side of an antenna pattern of a magnetic field antenna is closed to between the main antenna and the magnetic field antenna is more easily generated. The band disturbing element may be composed of ferrite core or the like.
    Type: Grant
    Filed: March 28, 2008
    Date of Patent: July 15, 2014
    Assignee: KYOCERA Corporation
    Inventors: Kenji Waku, Kunihiko Watanabe, Shin Takahashi, Tadashi Koyama
  • Patent number: 8754825
    Abstract: A method includes, during transmission and/or reception of a radio frequency signal, detecting an impedance associated with an antenna connected with a matching network; algorithmically determining a reactance value of at least one reactive element that forms a part of the matching network in accordance with the detected impedance and at least one parameter including at least one of a currently used radio frequency, at least one user/device factor, at least one radio frequency offset value, and at least one predetermined constant; and setting the value of the at least one reactive element to match the determined value.
    Type: Grant
    Filed: April 16, 2010
    Date of Patent: June 17, 2014
    Assignee: Nokia Corporation
    Inventor: Erik L. Bengtsson
  • Publication number: 20140145892
    Abstract: A portable communication device and an adjustable antenna thereof are disclosed herein. The portable communication device includes a substrate, the adjustable antenna and a control circuit. The adjustable antenna includes an antenna body, an adjusting element, a feeding terminal and a ground terminal. The antenna body has multiple conductive portions and is disposed above the substrate. The adjusting element is coupled between the conductive portions. The feeding terminal and the ground terminal extend from the antenna body and are coupled to the substrate. The control circuit feeds a first control signal and a second control signal respectively through the feeding terminal and the ground terminal to the adjusting element, so as to adjust an electrical length of the adjustable antenna.
    Type: Application
    Filed: November 29, 2012
    Publication date: May 29, 2014
    Applicant: HTC CORPORATION
    Inventors: Chun-Wei TSENG, Yu-Meng YEN, Ruey-Hsuan LEE, Chien-Chih CHEN, Yen-Liang KUO, Wan-Ming CHEN
  • Patent number: 8723745
    Abstract: An antenna element has first and second feed ports, and is simultaneously excited through the feed ports so as to simultaneously operate as first and second antenna portions respectively, associated with the feed ports. The antenna element is excited at one of a first frequency and a second frequency higher than the first frequency. An antenna apparatus is provided with: a slit that provides isolation between the feed ports; a trap circuit that allows the slit to provide isolation at the first or second frequency when the antenna element is excited at the first or second frequency; and a reactance element that shifts a frequency at which the slit provides isolation between the feed ports, to the first frequency, when the antenna element is excited at the first frequency.
    Type: Grant
    Filed: May 25, 2010
    Date of Patent: May 13, 2014
    Assignee: Panasonic Corporation
    Inventors: Satoru Amari, Atsushi Yamamoto, Tsutomu Sakata
  • Patent number: 8711047
    Abstract: A multi-band antenna array for use in wireless communication devices with up to three simultaneous operating modes with improved antenna efficiency and reduced antenna coupling across a broad range of operative frequency bands with reduced physical size is described. The multi-band antenna array includes at least two loop antenna elements, each of which is orthogonal to, and arranged in an embedded manner, relative to each other. Each loop antenna in the multi-band antenna array may include a corresponding tuning element for tuning to a desired resonant frequency, and be comprised of an upper and lower half with the corresponding tuning element coupled therebetween.
    Type: Grant
    Filed: March 13, 2009
    Date of Patent: April 29, 2014
    Assignee: QUALCOMM Incorporated
    Inventor: Allen Minh-Triet Tran
  • Publication number: 20140097994
    Abstract: A communication device includes a ground element and an antenna element. The antenna element includes a first radiation element, a second radiation element, and a control circuit. One end of the first radiation element is coupled to a signal source, and another end of the first radiation element is an open end. The second radiation element includes at least a first portion and a second portion. A first end of the first portion is a shorted end coupled to the ground element, and a fourth end of the second portion is an open end. The second radiation element surrounds the open end of the first radiation element. The control circuit is coupled between a second end of the first portion and a third end of the second portion of the second radiation element. The control circuit provides at least two different impedances.
    Type: Application
    Filed: December 17, 2012
    Publication date: April 10, 2014
    Applicant: ACER INCORPORATED
    Inventors: Kin-Lu WONG, Shu-Chuan CHEN
  • Publication number: 20140099903
    Abstract: Disclosed are to a communication terminal and an antenna apparatus thereof. The antenna apparatus includes an antenna device including a feeding point to which a signal is applied; and at least one variable reactance device connected to the antenna device. The communication terminal determines a communication network to access to drive the antenna apparatus corresponding to the determined communication network, and accesses to the determined communication network through the antenna apparatus to communicate. Accordingly, a resonance frequency band of the antenna apparatus is expanded.
    Type: Application
    Filed: October 4, 2013
    Publication date: April 10, 2014
    Applicant: LG INNOTEK CO., LTD.
    Inventor: Chang Wook KIM
  • Patent number: 8659491
    Abstract: A Radio Frequency (RF) device includes an adjustable antenna structure for coupling to a transmit/receive coupling module. The adjustable antenna structure includes an antenna and a plurality of transmission line elements. At least one of the plurality of transmission line circuit elements is selected, based on a transmission line characteristic signal, to form a transmission line circuit that is coupled to the antenna.
    Type: Grant
    Filed: October 26, 2012
    Date of Patent: February 25, 2014
    Assignee: Broadcom Corporation
    Inventor: Ahmadreza Rofougaran
  • Patent number: 8643558
    Abstract: A multi-frequency antenna (1) includes a grounding portion (1) extending along a transversal direction; a radiating arm (11) extending along a transversal direction and disposed above the grounding portion; a connecting arm (12) connected to the grounding portion and the radiating arm; a capacitor (13) connected to the radiating portion and the connecting arm; and a cable (15) having an inner conductor connected to the connecting arm and an outer conductor connected to the grounding portion.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: February 4, 2014
    Assignee: Hon Hai Precision Industry Co., Ltd.
    Inventors: Hsien-Sheng Tseng, Chun-Ming Chiu, Wen-Fong Su
  • Publication number: 20140015723
    Abstract: Disclosed is an antenna device for a portable terminal, including a circuit board having a conductive layer attached on a surface, a first slit formed by partially removing the conductive layer in a position adjacent to one side of the circuit board, the first slit extending in parallel with a lateral periphery of the circuit board, a radiation portion comprising part of the conductive layer positioned on the lateral periphery of the circuit board in one side of the first slit, and a feed line placed on the first slit and adapted to feed the radiation portion from the other side of the first slit. The radiation portion further comprises a second slit extending from the first slit to the lateral periphery of the circuit board across part of the conductive layer forming the radiation portion, and a frequency adjustment element placed on the second slit.
    Type: Application
    Filed: July 10, 2013
    Publication date: January 16, 2014
    Inventors: Bum-Jin Cho, Gyu-Sub Kim, Joon-Ho Byun
  • Patent number: 8618992
    Abstract: An antenna duplexer includes a transmission filter and a reception filter both coupled with an antenna terminal. The transmission filter has a lower pass band than the reception filter. The transmission filter includes a first series resonator coupled with a first terminal, a second series resonator connected to the first series resonator at a first node, a first parallel resonator connected to a first port of the first series resonator, a second parallel resonator connected to a first node and the first parallel resonator at a second node, a third parallel resonator connected to the first node, a fourth parallel resonator connected to the third parallel resonator at a third node, a first inductance element coupled with the second node and a ground, and a second inductance element coupled with the third node and the ground. The second inductance element has a lower inductance than the first inductance element.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: December 31, 2013
    Assignee: Panasonic Corporation
    Inventors: Joji Fujiwara, Tetsuya Tsurunari, Hiroyuki Nakamura
  • Publication number: 20130300619
    Abstract: An antenna apparatus for backscattering an incoming radio frequency (RF) signal includes an antenna for backscattering the incoming RF signal in accordance with a reflection coefficient characteristic of the antenna. A variable impedance circuit includes an output electrically connected to the antenna. A band-pass delta sigma modulator is coupled to the variable impedance circuit and digitally controls the output of the variable impedance circuit, such that the reflection coefficient of the antenna is adjusted based on the digitally controlled output of the variable impedance circuit. In an RFID network, the apparatus and method reduces the effect of DC offset in the reader device and the effects of the reader device's phase noise, while allowing for complex modulations.
    Type: Application
    Filed: May 14, 2012
    Publication date: November 14, 2013
    Inventor: Tajinder Manku
  • Patent number: 8570231
    Abstract: This application describes a dynamically tuned front end module using a modal antenna approach for improved communication system performance. The front end module consists of power amplifiers, filters, switches and antennas along with tuning circuits integrated and controlled to provide an optimized system for RF transmission. Dynamic tuning provides the ability to maintain optimized system performance for a wide variety of use cases and environments that the wireless device is operated in. Several transmission modes are accessed in an algorithm to optimize the performance of multiple wireless devices in a cellular system, to include a power conservation mode, emergency transmission mode, and cell capacity optimization mode. Dynamic adjustment of correlation and isolation between multiple antennas is a benefit provided by this front end topology.
    Type: Grant
    Filed: November 11, 2012
    Date of Patent: October 29, 2013
    Assignee: Ethertronics, Inc.
    Inventors: Laurent Desclos, Barry Matsumori, Sebastian Rowson, Jeffrey Shamblin
  • Publication number: 20130234903
    Abstract: A built-in antenna apparatus for a electronic device is provided. The antenna apparatus comprises a PCB with conductive and non-conductive areas. An antenna radiator is disposed at the non-conductive area of the PCB; the antenna radiator has a feeding portion and at least a first radiating portion configured in a first pattern branched from the feeding portion and has an end portion electrically connected to the conductive area. At least one capacitor is electrically connected in series within the first radiating portion. A resonant frequency of the first radiating portion is a function of a capacitance value of the at least one capacitor. The antenna can be provided in a smaller size for a given frequency band due to the capacitance. A second antenna radiator branched from the feeding portion can also be provided for operation at a different frequency band.
    Type: Application
    Filed: January 23, 2013
    Publication date: September 12, 2013
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Yong-Soo KWAK, A-Hyun SIN, Dong-Hyun LEE, Seong-Tae JEONG, Joon-Ho BYUN
  • Publication number: 20130237162
    Abstract: A mobile communication device includes an antenna unit to operate in multiple frequency bands by shifting the resonance frequency of the antenna using capacitors. A first capacitor unit may be formed by the disposal of a first electrode in a hole in a first antenna pattern and the formation of a second electrode in the portion of the first antenna pattern opposing the first electrode. The first capacitor unit may be formed in various ways to be activated by a switch. The connection of the first capacitor unit to a voltage supply and ground may trigger a shift in the resonant frequency of the first antenna pattern.
    Type: Application
    Filed: January 24, 2013
    Publication date: September 12, 2013
    Applicant: Pantach Co., Ltd.
    Inventor: Jong Cheal YOON
  • Publication number: 20130222195
    Abstract: A portable electronic device is provided that has a hybrid antenna. The hybrid antenna may include a slot antenna structure and an inverted-F antenna structure. The slot antenna portion of the hybrid antenna may be used to provide antenna coverage in a first communications band and the inverted-F antenna portion of the hybrid antenna may be used to provide antenna coverage in a second communications band. The second communications band need not be harmonically related to the first communications band. The electronic device may be formed from two portions. One portion may contain conductive structures that define the shape of the antenna slot. One or more dielectric-filled gaps in the slot may be bridged using conductive structures on another portion of the electronic device. A conductive trim member may be inserted into an antenna slot to trim the resonant frequency of the slot antenna portion of the hybrid antenna.
    Type: Application
    Filed: March 21, 2013
    Publication date: August 29, 2013
    Applicant: Apple Inc.
    Inventor: Apple Inc.
  • Publication number: 20130214979
    Abstract: An electronic device may have an antenna that includes conductive antenna structures forming an antenna resonating element and an antenna ground. A band-stop filter may be coupled between first and second portions of the conductive structures. The band-stop filter may be formed from multiple series-connected resonant circuits. The band-stop filter and an impedance matching circuit may be coupled in series between the antenna resonating element and the antenna ground. The band-stop filter may be characterized by a stop band. The antenna may be configured to operate in a first communications band that is outside of the stop band and a second communications band that is covered by the stop band. The impedance matching circuit may be an adjustable circuit that is used to tune the antenna. The adjustable circuit may be a switch-based adjustable capacitor that is adjusted to tune the response of the antenna in the first communications band.
    Type: Application
    Filed: February 17, 2012
    Publication date: August 22, 2013
    Inventors: Emily B. McMilin, Qingxiang Li, Robert W. Schlub
  • Patent number: 8508420
    Abstract: An antenna device and a wireless communication apparatus that are capable of obtaining a plurality of resonant frequencies and varying the plurality of resonant frequencies over a wide range are provided. A first antenna unit of an antenna device includes a feed electrode, a first radiation electrode, and a first frequency-variable circuit. The first frequency-variable circuit includes first and second reactance circuits each including a variable-capacitance diode. A control voltage is applied to the first frequency-variable circuit, and the resonant frequency of the first antenna unit can thus be varied. A second antenna unit includes the feed electrode, a second radiation electrode, and a second frequency-variable circuit. The second frequency-variable circuit includes first and third reactance circuits each including a variable-capacitance diode. A control voltage is applied to the second frequency-variable circuit, and the resonant frequency of the second antenna unit can thus be varied.
    Type: Grant
    Filed: January 13, 2009
    Date of Patent: August 13, 2013
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Shigeyuki Fujieda, Kazunari Kawahata, Kenichi Ishizuka