Abstract: An antenna system includes a circularly polarized (CP) antenna for receiving and/or transmitting a circularly polarized RF signal. The CP antenna includes a pair of radiating patches each having an elongated shape. An elongated axis is defined along a longest length of each of the radiating patches. The elongated axes are disposed generally perpendicular to one another to generate the circular polarization. A coplanar waveguide feeding element is disposed between the radiating patches for feeding RF signals from and/or to the radiating patches via electromagnetic coupling. A width of the slot of the coplanar waveguide is varied to provide impedance matching of the CP antenna with a transmission line.

Abstract: A backfire dielectrically loaded antenna for operation at a frequency in excess of 200 MHz includes a dielectric core having a relative dielectric constant greater than 5 and having an outer surface defining an interior volume the major part of which is occupied by solid material of the core; a three-dimensional antenna element structure including at least one pair of elongate conductive antenna elements disposed on or adjacent the side surface portion of the core and extending from a distal core surface portion towards a proximal core surface portion; a feed structure having an axially extending elongate laminate board including a transmission line section acting as a feed line which extends through a passage in the core from the distal core surface portion to the proximal core surface portion, and an antenna connection section having an integrally formed proximal extension of the transmission line section the width of which, in the plane of the laminate board, is greater than the width of the passage; and a

Abstract: A programmable antenna assembly includes a configurable antenna structure, a configurable antenna interface, and a control module. The configurable antenna structure includes a plurality of antenna elements that, in response to an antenna configuration signal, are configured elements into at least one antenna. The configurable antenna interface module is coupled to the at least one antenna and, based on an antenna interface control signal, provides at least one of an impedance matching circuit and a bandpass filter. The control module is coupled to generate the antenna configuration signal and the antenna interface control signal in accordance with a first frequency band and a second frequency band such that the at least one antenna facilitates at least one of transmitting and receiving a first RF signal within the first frequency band and facilitates at least one of transmitting and receiving a second RF signal within the second frequency band.

Abstract: A dielectric antenna component (200) suitable for smallsized radio devices and an antenna based on such an antenna component. A substrate with relatively high permittivity for a radiating conductor is used in the antenna for reducing the size of the antenna. The substrate (210) is elongated, and the radiating conductive coating (220) constitutes a loop circulating via its ends. The width of one long side (221) of the loop is at most half of the width of the other long side (222). The bandwidth of a very small-sized antenna can be made large, because the phases of the electromagnetic waves in the radiator branches are nearly equal. For the same reason the efficiency of the antenna can be made relatively good in spite of the dielectric substrate.

Abstract: An object of the invention is to stabilize the convergence operation at the automatic impedance matching time and ensure the reception quality in the convergence process in a fading environment in a radio communication apparatus which performs automatic impedance matching between an antenna and a Radio frequency section to decrease the impedance matching loss, for example, when the apparatus is brought close to a human body.

Abstract: A novel geometry, the geometry of Space-Filling Curves (SFC) is defined in the present invention and it is used to shape a part of an antenna. By means of this novel technique, the size of the antenna can be reduced with respect to prior art, or alternatively, given a fixed size the antenna can operate at a lower frequency with respect to a conventional antenna of the same size.

Abstract: An impedance control apparatus and method for portable mobile communication terminal is disclosed capable of accurately adjusting impedances relative to environment when the portable mobile communication terminal is being used, wherein an impedance of a first variable impedance matching part is varied to receive a reception impedance correction signal transmitted by a base station and to detect a reception strength, an impedance of the first variable impedance matching part is set by a impedance value of the largest reception strength out of the reception strengths, the portable mobile communication terminal varies the impedance of a second variable impedance matching part to transmit a transmission impedance correction signal to a base station and to allow the base station to detect the reception strength, and the impedance setting of the second variable impedance matching part is performed using the reception strength detected by the base station.

Abstract: The invention discloses a leaky-wave dual-antenna system comprising a transmitting antenna array and a receiving antenna array. The transmitting antenna array comprises plural first microstrips and plural corresponding first differential circuits, and each of the first differential circuit matches the corresponding first microstrip by a L-type matching network; the receiving antenna array comprises plural second microstrips and plural corresponding second differential circuits, and each of the second differential circuit matches the corresponding second microstrip by a L-type matching network. A first end and a second end of each of the first differential circuits are respectively connected to the corresponding first microstrip; a third end and a fourth end of each of the second differential circuits are respectively connected to the corresponding second microstrip.

Abstract: A device for matching an antenna impedance in a portable radio telephone having transmission and receiving circuits, a foldable casing enclosing the radio, the foldable casing movable between an unfolded position and a folded position, an antenna movable between an extracted position from the foldable casing and a retracted position into the foldable casing includes means for sensing whether the foldable casing is in the unfolded position and for sensing whether the antenna is in the extracted position, and for providing a sensing signal in response thereto, and means for matching an impedance of the antenna and an impedance of the radio in response to the sensing signal, thereby making an optimal matching of impedances between the antenna and the radio according to the states of the folder casings and the antenna, and according to the transmission/reception mode.

Abstract: An apparatus includes first and second speakers, and an antenna including a first pair of wires connected to the first speaker, a second pair of wires connected to the second speaker, and a conductive sleeve surrounding portions of the first and second pairs of wires, the sleeve forming a coaxial capacitor with the first and second pairs of wires. The apparatus can further include an inductor connected between the first and second pairs of wires and the sleeve, to form a resonant circuit with the coaxial capacitor.

Abstract: The present invention is related to a coupled-fed multi-band loop antenna. The antenna comprises a dielectric substrate, a ground plane located on the dielectric substrate and has a grounding point, a radiating portion which comprise a supporter, a coupling trip and a loop strip, and a matching circuit. The coupling strip and loop strip are both located on the supporter, with the coupling strip surrounded by the loop strip. The length of loop strip is about 0.25 wavelength of the antenna's first resonant mode. The loop strip has a first end paralleling with the coupling loop, a second end and a shorting point near the second end and electrically connected to the grounding point on the ground plane. The matching circuit is on the dielectric substrate. One terminal of the matching circuit is connected to the coupling strip, and the other is connected to a signal source.

Abstract: A quadrifilar helical antenna comprising two pairs of filars having unequal lengths and phase quadrature signals propagating thereon. A conductive H-shaped impedance matching element matches a source impedance to an antenna impedance. The impedance matching element having a feed terminal at the center thereof from which current is supplied to the two filars of each filar pair disposed about an edge of the impedance matching element and symmetric with respect to a center of the impedance matching element. The impedance matching element further comprises a reactive element for matching the antenna and source impedances.

Abstract: An antenna module includes an antenna, a substrate defining a plurality of notches, and a plurality of filling blocks. The antenna is attached to the substrate. The filling blocks have a permittivity higher than the substrate and are received in a portion of the notches covered by the antenna to raise the permittivity of the substrate.

Abstract: An approximately planar wideband antenna can include a first conductive portion coupled to a dielectric portion and mechanically supported by the dielectric portion, the first conductive portion including at least one edge corresponding to a planar conic section, such as including one or more of an elliptic, a parabolic, or a hyperbolic shape. Such an antenna can be electrically coupled to a matching circuit, the matching circuit configured provide a specified input impedance corresponding to a specified range of frequencies. Such a range of frequencies can span at least an octave, or more.

Abstract: An antenna device includes: a substrate; a radiating electrode formed on the substrate, a ground electrode formed on the substrate and disposed opposite the radiating electrode, a feed line as a distributed constant transmission line connected via a feed point to the radiating electrode, at least one impedance matching element for impedance-matching the radiating electrode at a prescribed signal frequency by being connected in parallel with the radiating electrode to the feed line at a position a prescribed distance away from the feed point, and a switch, interposed between the at least one impedance matching element and the feed line, for connecting or disconnecting the at least one impedance matching element to or from the feed line in accordance with a prescribed control signal.

Abstract: An antenna apparatus includes an antenna linear element including a linear conductor provided with a first end and a second end, a ground conductor connected to the linear conductor at the second end, a transmission line connected to the linear conductor at the first end, and a matching circuit including a first impedance adjustment element connected to the transmission line at an end on an opposite side to the end of transmission line connected to the linear conductor and a second impedance adjustment element which is connected to the first impedance adjustment element on an opposite side to the end of the first impedance adjustment element connected to the transmission line and an end of which on an opposite side to the end connected to the first impedance adjustment element is grounded, a connection part between the first impedance adjustment element and second impedance adjustment element receiving a power feed.

Abstract: A programmable antenna includes a fixed antenna element and a programmable antenna element that is tunable in response to at least one antenna control signal, wherein tuning the programmable antenna element changes an impedance of the antenna. A programmable impedance matching network is tunable in response in response to at least one matching network control signal to adjust for the changes in the impedance of the antenna.

Abstract: This multi-antenna apparatus includes a first looped antenna element wound from a first end of the first looped antenna element on a side of a first feeding point in a prescribed direction, a second looped antenna element wound from a first end of the second looped antenna element on a side of a second feeding point in a direction opposite to the prescribed direction, a connecting portion connecting a second end of the first looped antenna element and a second end of the second looped antenna element with each other, and an impedance element arranged between the connecting portion and a ground potential.

Abstract: An antenna device for a portable electronic device, preferably for the FM frequency range, generally includes a monopole radiating and/or radiation receiving element including a feeding portion adapted to be connected to an antenna connection point. An inductor is connectable between the antenna connection point and ground. The input of an amplifier stage is also connectable to the antenna connection point. An output of the amplifier stage is connectable to a radio circuit, all provided in the interior of the portable electronic device.

Abstract: An antenna connected to an interface connection port is provided. The antenna comprises a ground surface having a plurality of bands thereon; a first radiation element disposed on the ground surface and including a first bending section and a second bending section, wherein the ground surface is extended from the first bending section; and a second radiation element having a shape of a strip, extended from the second bending section, including a first end and a second end, and having a first flange at the first end and a second flange at the second end.

Abstract: A planar antenna, such as included as a portion of a wireless communication assembly, can include a dielectric portion, a first conductive portion, extending along a surface of the dielectric portion, and a second conductive portion, parallel to the first conductive portion, extending along the surface of the dielectric portion, the second conductive portion laterally offset from the first portion to provide a specified lateral separation between the first and second conductive portions. The first and second conductive portions can be configured to provide respective resonant operating frequencies ranges offset from each other, and the first and second conductive portions can be configured to follow a commonly-shared path, including at least one bend, along the surface of the dielectric portion.

Abstract: A tire air pressure monitoring system has a plurality of sensor units and a receiver. The pressure sensor units are mounted near corresponding tires to measure tire air pressures and transmit transmission signals indicating the respective measured tire air pressures. The receiver has an antenna element, a variable capacitor and a power supply source. The variable capacitor is coupled to the antenna element. The power supply source supplies electric power to the antenna element. The voltage supplied to the variable capacitor is controlled so that a current flowing in the antenna element is changed and its directivity is changed. Thus, the transmission signals will be received more surely.

Abstract: Provided are a first planar radiating element and second planar radiating element that have at least one side. At least the first or second radiating element has a strip-shaped element. A first side of the first radiating element and a second side of the second radiating element are so disposed as to be parallel to each other, face each other and be shifted slightly in a parallel direction. The strip-shaped element is so disposed as to be connected to any side other than the first and second sides of the first and second radiating elements, run parallel to the first and second sides, and not go beyond tips positioned at the outermost points of the first and second sides.

Abstract: A structure made of in certain frequency bands invisible material includes a transmission line network. The structure has a matching layer at the boundary of the material, supporting structures inside the transmission line network and that the transmission line network has been matched with the surrounding space.

Abstract: In an antenna array, a metal layer is used for covering a block mapped by micro-strips, which are disposed on an obverse side of a base plate, on a reverse side of the base plate, so as to concentrating energy of radio signals emitted from radiator sets on a predetermined direction. The base plate and elements loaded by the base plate are fabricated according to designed specifications, so as to enhance the concentration of energy of the radio signals on the predetermined direction.

Abstract: A radio frequency (RF) transceiver includes a baseband processing module, a configurable receiver section, a configurable transmitter section and a configurable antenna assembly. The baseband processing module converts outbound data into an outbound symbol stream, converts an inbound symbol stream into inbound data and generates a transmit adjust signal and a receive adjust signal. The receiver section converts an inbound RF signal into the inbound symbol stream. The transmitter section converts the outbound symbol stream into an outbound RF signal. The antenna assembly receives the inbound RF signal via a first antenna structure and transmits the outbound RF signal via a second antenna structure. The first antenna structure and/or the configurable receiver section adjusts phase and/or amplitude of the inbound RF signal in accordance with the receive adjust signal.

Abstract: A portable electronic device includes a housing, a circuit board received in the housing, and a memory card retaining mechanism received in the housing. The memory card retaining mechanism includes a plurality of conductive parts. The plurality of conductive parts cooperatively form an antenna integrated with the memory card retaining mechanism and connected to the circuit board.

Abstract: Disclosed are an apparatus and a method for preventing the degradation of RF performance due to a change in impedance of an antenna in a mobile communication terminal. The mobile communication terminal includes a plurality of impedance matching circuits and a controller of the mobile communication terminal is adapted to measure the reflection voltage of the antenna, select one impedance matching circuit corresponding to the measured reflection voltage, and connected with the antenna through the selected impedance matching circuit. As a result, when the impedance value of the antenna is changed, it is possible to prevent the degradation of performance of the RF module of the mobile communication terminal by using an impedance matching circuit, which can optimize the reflection loss caused by the reflection voltage of the antenna according to a change in impedance value.

Abstract: An antenna apparatus includes an antenna block and a substrate. The antenna block has a base that is made of a substantially cuboid dielectric body, an upper-surface conductor formed on an upper surface of the base, first and second pad electrodes that are formed on both ends of a bottom surface of the base in a longitudinal direction of the base, respectively, and a lateral-surface conductor connecting the upper-surface conductor and the second pad electrode. The substrate has a region mounting the antenna block, a ground pattern provided around the mounting region, first and second lands that are provided within the mounting region so as to correspond to the positions of the first and second pad electrodes, a feed line that is connected to the first land, an impedance-adjusting pattern connecting the first land and the ground pattern, and a frequency-adjusting pattern connecting the second land and the ground pattern.

Abstract: A multiband built-in antenna for a portable terminal is provided, which includes a feeding part electrically connected to a Radio Frequency (RF) connector of a terminal main board; an antenna radiator comprising at least two ground parts electrically connected to a ground means of the terminal and formed at different locations; and a switching means commonly linked to a ground line of each ground part of the antenna radiator, and selectively connecting one or more of the at least two ground parts electrically to the ground means according to a switching operation

Abstract: A method to design antennas with broadband characteristics. In an exemplary embodiment, a method comprises loading an antenna structure with multiple reactive loads. The multiple loads are synthesized by applying the theory of Characteristic Modes. Another exemplary embodiment includes an antenna adapted to have broadband characteristics. One example is a wire dipole antenna. In an exemplary embodiment, a loaded antenna may be adapted to resonate an arbitrary current over a wide frequency band. The loads may require non-Foster elements when realized. Exemplary embodiments may include the broadband characteristics of the both the input impedance at the terminal of the antenna as well as the radiation pattern.

Abstract: A transceiving circuit (1, 1?) for contactless communication comprises transmitter means (3) being adapted to generate an electromagnetic carrier signal and to modulate the carrier signal according to transmitting data, and an antenna (5) being connected to and driven by the transmitter means (3) with the modulated carrier signal. At least one impedance-matching capacitor (C1a) is arranged serially to the antenna (5).

Abstract: A programmable antenna includes a fixed antenna element and a programmable antenna element that is tunable to one of a plurality of resonant frequencies in response to at least one antenna control signal. A programmable impedance matching network is tunable in response to at least one matching network control signal, to provide, for instance, a substantially constant load impedance. A control module generates the antenna control signals and the matching network control signals, in response to a frequency selection signal.

Abstract: A communication system includes the following elements: a transmitter including a transmission circuit unit configured to generate an RF signal for transmitting data and an electric-field-coupling antenna configured to transmit the RF signal as an electrostatic field; a receiver including an electric-field-coupling antenna and a reception circuit unit configured to receive and process the RF signal received by the electric-field-coupling antenna; and a surface-wave propagation medium configured to provide a surface-wave transmission line to transmit a surface wave emanating from the electric-field-coupling antenna of the transmitter with low propagation loss.

Abstract: A signal branching filter according to the invention is a signal branching filter connected to a network having at least four terminals. The signal branching filter includes a first line one end of which is connected to a first terminal of the network, a second line one end of which is connected to a second terminal of the network, a third line one end of which is connected to a third terminal of network, and a fourth line one end of which is connected to a fourth terminal of the network. The other end of the first line and the other end of the second line are connected to each other at a first node, and the other end of the third line and the other end of the fourth line are connected to each other at a second node. When a signal is received from the first node, a phase difference between a phase of a signal appearing on a second node side of the third line and a phase of a signal appearing on a second node side of the fourth line is almost 180°±360°*n is an integer equal to or larger than 0).

Abstract: A multifunctional antenna chip is able to mate with many kinds of matched circuits and is able to adjust the character of an antenna structure of the multifunctional antenna chip, in order that the antenna structure has one or multiple standard working frequencies. The antenna structure is a folded antenna structure basically; this can save its volume occupied. And the multifunctional antenna chip has a non-signal inputting pin for connection to thereby increase shape of the antenna for adjusting the style of the antenna structure designed.

Abstract: A communication system includes a transmitter including a transmission circuit unit that generates an RF signal for transmitting data and an electric-field-coupling antenna that transmits the RF signal as an electrostatic field, a receiver including an electric-field-coupling antenna and a reception circuit unit that subjects an RF signal received by the electric-field-coupling antenna to reception processing, and a surface-wave propagating means for providing a surface wave transmission line made of a conductor that propagates a surface wave radiated from the electric-field-coupling antenna of the transmitter along a surface of the surface wave transmission line.

Abstract: A multi-band antenna includes an insulative carrier board arranged on the top side of the display screen of a notebook computer, a main antenna which has the top metal strip thereof disposed at the top edge of the insulative carrier board and the grounding metal strip thereon arranged on the insulative carrier board, an inverted L antenna arranged on the insulative carrier board, a first capacitor, a second capacitor, an antenna feed-in terminal and/or an inductor set between the inverted L antenna and the main antenna to achieve optimal matching subject to adjustment of the capacitance values of the first and second capacitors and the inductance value and position of the inductor.

Abstract: A multi-directional panel antenna is provided for the reception of TV broadcast VHF and UHF signals. The panel antenna's circuit board has its current path substantially covers the surface of the circuit board so as to produce multi-directional reception patterns. An iron-core winding is configured at a feed-in terminal of the panel antenna for impedance matching and signal concentration. The panel antenna also uses air to reduce dielectric loss. A MMIC signal amplification device is provided for enhanced gain. Ceramic capacitors are provided to increase the reception wavelength of the panel antenna so that it falls within a lower section of the VHF band.

Abstract: A semiconductor device which detects a power level of a radio-frequency signal includes: a switch FET including: a semiconductor layer; a source electrode and a drain electrode; a first gate electrode; a second gate electrode formed between the first gate electrode and the drain electrode and on the semiconductor layer, each of the first gate electrode and the second gate electrode being in Schottky contact with the semiconductor layer, and the source electrode receiving the radio-frequency signal; a resistor having one end electrically connected to the first gate electrode and an other end electrically connected to the drain electrode via a capacitor; and a power detection terminal electrically connected to a connecting point between the resistor and the capacitor.

Abstract: An antenna includes a first antenna element and a second antenna element. The first antenna element and the second antenna element are both configured to receive signals in a first band of frequencies and in a second band of frequencies. Frequencies in the second band of frequencies are greater than frequencies in the first band of frequencies. A first impedance matching circuit, coupled to the first antenna element, includes a first plurality of filters having a first shared component. A second impedance matching circuit, coupled to the second antenna element, includes a second plurality of filters having a second shared component. A feed network circuit is coupled to the first impedance matching circuit and to the second impedance matching circuit and has a combined output corresponding to the signals received by the first antenna element and a second antenna element.

Abstract: A transponder that may be used as an RFID tag includes a passive circuit to eliminate the need for an “always on” active RF receiving element to anticipate a wake-up signal for the balance of the transponder electronics. This solution allows the entire active transponder to have all circuit elements in a sleep (standby) state, thus drastically extending battery life or other charge storage device life. Also, a wake-up solution that reduces total energy consumption of an active transponder system by allowing all non-addressed transponders to remain in a sleep (standby) state, thereby reducing total system or collection energy. Also, the transponder and wake-up solution are employed in an asset tracking system.

Abstract: A multimode communication device (10 or 50) having an antenna arrangement (14 or 54) having a first antenna (18) operational in both low bands and high bands, a second antenna (20) operational in high bands, a tuner (26) coupled to the first antenna adapted to adjust matching elements to modify return loss to lower reflected power, a switching mechanism (28) for selecting between the first antenna and the second antenna, and a controller (30) coupled to the switching mechanism and the tuner.

Abstract: In a dielectrically-loaded multifilar helical antenna, a conductive phasing ring is arranged between and couples together feed nodes and the helical radiating elements. The phasing ring includes an annular conductive path having an electrical length equivalent to a full wavelength at the operating frequency so as to be resonant at that frequency. The helical elements are coupled to the outer periphery of the phasing ring at respective spaced apart coupling locations. The helical elements may include open-circuit or closed-circuit elongate conductive tracks, or a combination of both. In the case of the helical elements being closed-circuit tracks, these tracks are interconnected by a second resonant ring, which is resonant at the same frequency as or a different frequency from the first resonant ring. The invention is applicable to both end-fire and back-fire helical antennas.

Abstract: A multiband antenna includes a feed portion, a radiating portion and a matching portion. The radiating portion is operable to transceive electromagnetic signals, and includes a first radiator, a second radiator and a third radiator. The first radiator is connected to the feed portion, and includes a first free end and a second free end. The second radiator is bent, and includes a first feed end and a third free end, wherein the first feed end is connected to the feed portion. The third radiator is substantially L shaped, and includes a second feed end and a fourth free end, wherein the second feed end is electrically connected to the feed portion. The matching portion is rectangularly shaped, and electrically connected to the first radiator, for impedance matching.

Abstract: The discone antenna is a small communication antenna with broad voltage standing wave ratio (VSWR) bandwidth. The discone antenna includes a conical antenna element and a disc antenna element adjacent the apex thereof and including a proximal electrically conductive planar member and a spaced apart distal electrically conductive planar member being electrically connected together at respective peripheries thereof defining a folded ground plane. An antenna feed structure is coupled to the disc and conical antenna elements and includes a first conductor coupled to the proximal electrically conductive planar member, and a second conductor coupled to the conical antenna element and to the distal electrically conductive planar member. An impedance element, such as a resistor, may be connected between the second conductor and the distal electrically conductive planar member.

Abstract: A system comprising at least one antenna and a circuit, wherein the circuit is at least in part not a semiconductor chip or a die. The at least one antenna and the circuit are arranged on a package. Alternatively described is a system comprising at least one antenna and at least one circuit, wherein the at least one antenna and the at least one circuit are arranged on a package, wherein the at least one circuit performs a radio-frequency and optionally a base-band and/or a digital functionality.

Abstract: There is provided an antenna element for use in an ultra wideband network, the antenna element comprising a radiating element, for radiating signals over a range of frequencies in response to a signal received at a feed point; and a frequency shaping device located near the feed point of the radiating element for acting as a broad-banding device for the radiating element. A plurality of antenna elements may be formed into an antenna array.

Abstract: An array antenna is provided that operates at high-band and low-band, comprising a first array of high-band radiators and a second array of low-band radiators, each respective low-band radiator disposed so as to be interleaved between the high-band radiators so as to share an aperture with the high-band radiators. Each low-band radiator comprises a coaxial section, a dielectric section, a waveguide, and a planar section. The dielectric section is formed of a continuous piece of dielectric material and includes a hollow opening formed perpendicular to the coaxial section, and a plurality of step transitions, wherein at least one of the step transitions is disposed within and partially fills the waveguide operably coupled to the planar section. The planar section is oriented to the portion of high-band radiators such that the output of the respective low-band radiator is disposed between and within the spacing between adjacent high-band-radiators.

Abstract: A dipole antenna is provided herein with improved performance at a lower end of the antenna's operating frequency range. According to one embodiment, the dipole antenna may include a plurality of antenna elements coupled to impedance transformer via a pair of cones and a pair of ears. The dipole antenna may also include a high-pass matching network specifically configured to improve antenna performance at the lower end of the operating frequency range. For example, a first stage of the matching network (i.e., closest to the antenna elements) may include two series capacitors, while a second stage of the matching network (i.e., furthest from the antenna elements) includes an inductor coupled in shunt between the two capacitors.