Abstract: A multiband antenna, includes a main antenna, a coupling unit, and a matching unit. The main antenna includes a feed portion, a bent portion, a radiation portion, and an extending portion in a same plane. One end of the feed portion is connected to the coupling unit. The bent portion is perpendicularly connected to the other end of the feed portion. The radiation portion is parallel with the feed portion and perpendicularly connected to one end of the bent portion away from the feed portion. The extending portion is connected to one end of the radiation portion away from the bent portion, the coupling unit is parallel with the main antenna and connected to the matching unit, the matching unit feeds signals to and grounds the multiband antenna.

Abstract: Provided are an antenna-device substrate which is capable of flexibly adjusting multiple resonance frequencies and can also be made small and thin and an antenna device provided with the same. The present invention is provided with a substrate main body (2), first to third elements (3 to 5), a ground plane (GND), and a ground connection pattern (6), wherein the first element is provided with a feed point (FP) at the base end and extends while having a power feeding-side passive element (P0), a first connecting portion (C1), and an antenna element (AT); the second element extends while being connected to the first element via a second connecting portion (C2); and the third element extends while being connected to the first element via a third connecting portion (C3).

Abstract: Presented is radio frequency antenna circuit for portable and/or compact electronic devices. Embodiments comprise an antenna connected to an unbalanced current feeding arrangement. The unbalanced feeding arrangement may generate common mode currents which increase the overall radiation resistance and efficiency of the antenna circuit.

Abstract: A method and apparatus for compensating is described, in which a tuning network is electrically coupled to an antenna and to a phase shift network. A controller communicatively linked to the tuning network and to the phase shift network receives data regarding the state of a communication system. The controller changes the impedance of the tuning network, and changes the phase shift of the phase shift network based on the received data. The received data may include information regarding the channel, band, or sub-band on which a communication device is communicating; information regarding on the application state of the device; and the modem state of the device.

Abstract: An antenna module includes an antenna, a tunable matching circuit, a power detector and a control unit. The antenna comprises a feeding point. The tunable matching circuit, electrically connected between the antenna and the power detector and configured to provide a loading impedance, comprises a plurality of tunable impedance elements connected to each other and electrically connected to the feeding point as well. The power detector is electrically connected between the tunable matching circuit and a power amplifier and configured to detect a power indicator. The control unit, electrically connected to the tunable matching circuit and the power detector, is configured to read the power indicator and RSSI to generate a control signal for the tunable matching circuit, which consistently changes the loading impedance to achieve impedance matching.

Abstract: A mobile communication device has a number of selectable states, an antenna, and a communication circuit for transmitting and receiving communication signals. The mobile device also includes an impedance matching circuit having impedance matching networks. Each impedance matching network is associated with at least one of the selectable states of the mobile communication device and is configured to optimize the impedance match between the communication circuit and the antenna based on the selectable state of the mobile communication device with which the impedance matching network is associated. A switching network is included for coupling the antenna to the communication circuit together using one of the impedance matching networks based on a selected state of the mobile communication device.

Abstract: For a mobile terminal for receiving wireless transmissions from a transmitter and transmitting wireless transmissions to a receiver it proposed to provide an antenna arrangement having a plurality of antenna elements each provided on or within a common body or a respective body of the terminal in a defined spatial relation to a conducting chassis part, wherein at least one first antenna element is located on a first side and at least one second antenna element is located on a second side of the same conductive chassis part or of the respective conducting chassis part, wherein high frequency circuitry, for transmitting a respective wireless transmission, is adapted to simultaneously drive said first antenna element and said second antenna element by feeding the same or corresponding high frequency signals to said first antenna element and to said second antenna element.

Abstract: The present invention relates to a circularly polarized antenna which is applicable to small-sized communication modules and terminals to have a subminiature and ultralight antenna using a coaxial connector and a series power distributor, including: an upper printed circuit board having a plurality of horizontal monopole radiating elements which are arranged at a constant intervals; a lower printed circuit board having a feed network which is provided at a constant interval from the upper printed circuit board to face the upper printed circuit board; and a plurality of coaxial connectors which electrically connect each horizontal monopole radiating element of the upper printed circuit board with the feed network of the lower printed circuit board.

Abstract: A wireless IC device includes a wireless IC chip; a feeder circuit board which has the wireless IC chip located thereon, is magnetically coupled to a radiation plate, supplies electric power to the wireless IC chip, and relays signals between the wireless IC chip and the radiation plate; and a substrate on which the feeder circuit board is placed. On the substrate, there are formed a plurality of positioning markers indicating the boundaries of a plurality of positioning areas in which the feeder circuit board is selectively placed.

Abstract: An antenna device includes a first antenna element resonating at a frequency in a first frequency band, a first matching circuit attaining matching between a first radio frequency circuit and the first antenna element, a second antenna element resonating at a frequency in a second frequency band, a second matching circuit attaining matching between a second radio frequency circuit and the second antenna element, a first band-pass circuit connected with the second antenna element and the second matching circuit to selectively conduct a signal in the second frequency band and a second band-pass circuit connected with the second antenna element and grounded to selectively conduct a signal in the first frequency band, wherein the second antenna element is utilized as a parasitic element for the first antenna element.

Abstract: An antenna element has an upstanding section erected from a base member; a tuning section extended from the upper end of the upstanding section into one direction in a parallel plane parallel to the base member, bent in the middle, and then extended in the direction opposite the one direction; and an open element section extended from the front end of the tuning section in the direction in which the open element section spirally turns in the parallel plane about the upstanding section.

Abstract: The present invention relates to an RE antenna structure that includes a planar structure and a loading plate, such that the planar structure is mounted between a ground plane and the loading plate to form an RF antenna. The loading plate may be about parallel to the ground plane and the planar structure may be about perpendicular to the loading plate and the ground plane. The loading plate may allow the height of the RF antenna structure above the ground plane to be relatively small. For example, the height may be significantly less than one-quarter of a wavelength of RF signals of interest. The planar structure may include two conductive matching elements to help increase the bandwidth of the RF antenna structure.

Abstract: A communication device having a wireless communication system and a Near Field Communication (NFC) circuit is provided. The NFC circuit includes two pads, two ferrite beads and a NFC controller. The first pad and the second pad are coupled to a NFC antenna. The first and the second ferrite bead are respectively coupled to the first pad and the second pad. The NFC controller includes two pins. The first pin and the second pin are coupled to the first ferrite bead and the second ferrite bead, respectively. The first pin and the second pin output a differential NFC signal to be emitted by the NFC antenna. The first and the second ferrite bead allow the fundamental frequency component of the NFC signal to pass, and filter out a plurality of high-frequency components for avoiding the operating frequency of the wireless communication system from being interfered by the high-frequency components.

Abstract: An impedance matching network includes a first terminal, a second terminal, and a reference potential terminal. The impedance matching network further includes a first shunt branch between the first terminal and the reference potential terminal, the first shunt branch including a capacitive element. The impedance matching network also includes a second shunt branch between the second terminal and the reference potential terminal, the second shunt branch including an inductive element. Furthermore, the impedance matching network includes a transmission line transformer with a first inductor path and a second inductor path, wherein the first inductor path connects the first terminal and the second terminal. An alternative impedance matching network includes a transformer and an adaptive matching network. The transformer is configured to transform an impedance connected to a first port so that a corresponding transformed impedance lies within a confined impedance region in a complex impedance plane.

Abstract: An antenna system comprises an antenna that integrates a separate fed through coaxial cable as part of its resonant structure. The fed through coaxial cable is used to feed a second antenna. This design allows for the antenna and the fed through cable to be accommodated in a very limited space at the edge of a handheld electronic device.

Abstract: A three-dimensional dual-band antenna including a first radiation portion, a second radiation portion, a connection portion, an impedance matching portion and a feeding portion is provided. The second radiation portion is located under the radiation portion and parallel with the first radiation portion. The connection portion is connected to the first side of the first radiation portion and extended downward vertically, for connecting the first radiation portion and the second radiation portion. The impedance matching portion is connected to a second side of the first radiation portion and extended downward vertically. The first side and the second side are opposite. The feeding portion is connected to the second side and extended downward vertically. The feeding portion receives a feeding signal. The first and the second radiation portion are operated at the first and the second bandwidth respectively, wherein the second bandwidth is in higher frequency than the first bandwidth.

Abstract: An apparatus includes an antenna element that operates in at least first and second non-overlapping frequency bands and has geometric elements arranged to define empty spaces in the antenna element to provide first and second winding current paths through the antenna element, the first and second winding current paths circumventing the empty spaces and respectively corresponding to the first and second frequency bands to provide the antenna element with multi-band behavior. The apparatus further includes a ground plane, with the antenna element being electrically coupled to the ground plane. The antenna element provides a substantially similar impedance level and radiation pattern in the first and second frequency bands. The geometric elements are arranged such that the antenna element does not comprise a group of single band antennas that respectively operate in the first and second frequency bands, and the antenna element is not a fractal type antenna element.

Abstract: An apparatus includes an internal, multiband antenna element concealed within a portable communication device. The antenna element operates in at least three frequency bands and includes geometric elements arranged to define empty spaces in the antenna element to provide at least three winding current paths through the antenna element which circumvent the empty spaces, the at least three winding current paths respectively corresponding to the at least three frequency bands to provide the antenna element with multi-band behavior, wherein each of two or more of the geometric elements is traversed by the at least three winding current paths. The apparatus further includes a ground plane, with the antenna element being electrically coupled to the ground plane. The geometric elements are arranged such that the antenna element does not comprise a group of single band antennas that respectively operate in the at least three frequency bands.

Abstract: An apparatus includes an antenna concealed within a portable communication device and configured to operate in non-overlapping frequency bands. The antenna includes an antenna element with a multilevel structure of geometric elements arranged to define empty spaces to provide winding current paths through the antenna element which circumvent the empty spaces, the winding current paths respectively corresponding to the non-overlapping frequency bands. The antenna further includes a ground plane, with the antenna element being electrically coupled to the ground plane. The antenna element provides a substantially similar impedance level and radiation pattern in the non-overlapping frequency bands. The geometric elements are arranged such that the antenna element does not comprise a group of single band antennas that respectively operate in the non-overlapping frequency bands, and the antenna element is not a fractal type antenna element.

Abstract: Methods and systems for an on-chip and/or on-package T/R switch and antenna are disclosed and may include selectively coupling one or more low noise amplifiers (LNAs) and/or one or more power amplifiers (PAs) to one or more ports of a multi-port distributed antenna utilizing configurable transmit/receive (T/R) switches integrated on a chip with the LNAs and PAs. The LNAs and PAs may be impedance matched to the antenna by coupling them to a port based on a characteristic impedance at the port. The T/R switches may be integrated on a package to which the chip may be coupled. The signals transmitted and received by the antenna may be time division duplexed. The antenna, which may include a microstrip antenna, may be integrated on the chip or the package. The LNA and the PA may be coupled to different ports on the antenna via the T/R switches.

Abstract: Systems and methods are provided for an antenna coupler mechanism. The antenna coupler mechanism includes a first tuning leg configured to accept a radio frequency device. The first tuning leg includes a first inductive circuit element that is connected in series with the radio frequency device. The antenna coupler mechanism further includes a second tuning leg, which includes a second inductive circuit element and a capacitive circuit element connected in series. A bottom plate is connected in parallel with the first tuning leg and in parallel with the second tuning leg. The bottom plate comprises a third inductive circuit element and is configured to couple energy into a nearby structure.

Abstract: An apparatus includes a multi-band antenna element that operates in at least three frequency bands and includes geometric elements arranged to define empty spaces in the antenna element to provide at least three winding current paths through the antenna element which circumvent the empty spaces, the at least three winding current paths respectively corresponding to the at least three frequency bands, wherein each of two or more of the geometric elements is traversed by more than one of the at least three respective winding current paths. The antenna element provides a substantially similar impedance level and radiation pattern in the at least three frequency bands. The geometric elements are arranged such that the antenna element does not comprise substantially non-overlapping portions that serve as respective single band antennas, and a geometry of the antenna element is not substantially self-repeating.

Abstract: An improved wireless radio-frequency (RF) transmission system is disclosed. The wireless RF transmission system comprises: 1) a radio frequency (RF) transceiver configured to transmit and receive radio-frequency signals; ii) an electrically small antenna having a complex impedance comprising a real part and an imaginary part; and iii) a tunable negative impedance converter (NIC) circuit coupling the electrically small antenna to the RF transceiver. The tunable NIC circuit is configured to perform antenna matching by reducing the imaginary part of the complex impedance of the electrically small antenna. The tunable NIC circuit is tuned by adjusting a transconductance value associated with the tunable NIC circuit.

Abstract: A wireless device, including an antenna different from another antenna included in one of two casings, in a joint part where the two casings are joined together, is capable of reducing deterioration in properties of the antenna included in the joint part.

Abstract: A differential antenna and associated control system applied to a digital television (TV). The control system includes a differential antenna receiving a broadcasting signal and generating a differential radio frequency (RF) signal including a positive signal and a negative signal; a control unit generating a selecting signal according to a selected channel; a switch circuit including a switch control circuit and a plurality of matching circuits. Each of the matching circuits optimizes part of the digital TV bandwidth, and the switch control circuit receives the selecting signal to control that an optimized positive signal is generated to the control unit after the positive signal passes through a first matching circuit of the matching circuits, and an optimized negative signal is generated to the control unit after the negative signal passes through a second matching circuit of the matching circuits.

Abstract: The present invention relates to an RF antenna structure that includes a planar structure and a loading plate, such that the planar structure is mounted between a ground plane and the loading plate to form an RF antenna. The loading plate may be about parallel to the ground plane and the planar structure may be about perpendicular to the loading plate and the ground plane. The loading plate may allow the height of the RF antenna structure above the ground plane to be relatively small. For example, the height may be significantly less than one-quarter of a wavelength of RF signals of interest. The planar structure may include two conductive matching elements to help increase the bandwidth of the RF antenna structure.

Abstract: The present invention refers to an antennaless wireless handheld or portable device (100) comprising: a user interface module (101), a processing module (102), a memory module (103), a communication module (104) and, a power management module (105); the communication module (104) including a radiating system (200) capable of transmitting and receiving electromagnetic wave signals in a first frequency region and in a second frequency region, wherein the highest frequency of the first frequency region is lower than the lowest frequency of the second frequency region; said radiating system (200) comprising a radiating structure (201) comprising or consisting of at least one ground plane layer (206) capable of supporting at least one radiation mode, the at least one ground plane layer (206) including at least one connection point (207); at least one radiation booster (204) to couple electromagnetic energy from/to the at least one ground plane layer (206), the/each radiation booster including a connection point (2

Abstract: Techniques for implementing an integrated antenna structure are described. In at least some embodiments, the integrated antenna structure includes an antenna that is folded and/or meandered in design to enable the antenna to be incorporated into a compact area. The integrated antenna structure further includes a printed circuit board (PCB) with a ground plane to which the antenna is connected. In implementations, the antenna and the PCB can be combined to form an integrated radiating structure that can be incorporated into a device to enable the device to transmit and/or receive wireless signals.

Abstract: An antenna structure includes a matching circuit, a flexible printed circuit board, and an external metal element. The matching circuit is configured to provide impedance. The flexible printed circuit board has a variable shape, wherein a metal wire is disposed on the flexible printed circuit board. The external metal element is coupled to a signal source through the metal wire disposed on the flexible printed circuit board and the matching circuit.

Abstract: The present invention relates to an antenna apparatus and a communication apparatus able to provide an antenna apparatus having wide band characteristics or diversity characteristics. A first antenna element 11, a second antenna element 12, and a divider circuit 13 to which both the antenna elements 11 and 12 are coupled via respectively separate transmission lines 15 and 16 are included. Additionally, a delay process is conducted on one of the transmission lines by modifying the lengths of the transmission line 15 coupling the first antenna element 11 to the divider circuit 13 and the transmission line 16 coupling the second antenna element 12 to the divider circuit 13. By conducting this delay adjustment, the input impedance and/or phase of the first and second antenna elements are adjusted, and wider band characteristics than the antenna characteristics of the first and second antenna elements individually are configured.

Abstract: An antenna arrangement comprising an input/output connection and a first and a second tuning network with different transfer functions. The arrangement additionally comprises an antenna and a switch for connecting the input/output connection of the arrangement to one of said tuning networks, with a second switch for connecting the antenna of the arrangement to the tuning network to which the input/output connection of the arrangement has been connected. The arrangement comprises a sensor for sensing a form factor of the arrangement or of an apparatus in which the arrangement is used, and said sensor can be used for influencing said first and second switches, so that a device which has been connected to the arrangement may be connected to the antenna via a tuning network optimal for the current form factor of the arrangement.

Abstract: This application relates to antennas including, for example, an antenna for operation at a frequency in excess of 200 MHz comprising: an insulative substrate having a central axis, an axial passage extending therethrough and an outer substrate surface which extends around the axis; a three-dimensional antenna element structure including at least one pair of axially coextensive elongate conductive antenna elements on or adjacent the outer substrate surface; and an axial feeder structure which extends through the passage and comprises an elongate laminate board wherein the laminate board proximal end portion includes lateral extensions projecting in opposite lateral directions, and wherein, adjacent the laminate board proximal end portion, the substrate has recesses on opposite sides of the axis which receive at least edge parts of the said lateral extensions of the laminate board proximal end portion.

Abstract: An improved variable matching network for use in a multi-band, multi-mode communications device provides dynamic, fine-tune impedance matching based on current operational conditions associated with a given signal. In one embodiment, gross parameters are selected based on one or more of the operational conditions. Delta parameters are provided using an optimization algorithm based on one or more of the operational conditions. And the gross and delta parameters are combined to obtain overall matching parameters that dynamically fine-tune discrete matching circuitry.

Abstract: A reflective impedance element is connected to a port of a composite right/left-handed transmission line, and operates at a predetermined operating frequency so that an impedance when the reflective impedance element is seen from the port becomes a pure imaginary number jB. A reflective impedance component is connected to a port of the composite right/left-handed transmission line, and operates at the predetermined operating frequency so that an impedance when the reflective impedance element is seen from the port becomes ?jB.

Abstract: The present disclosure relates to a radio frequency identification (RFID) tag antenna. The RFID tag antenna includes: a substrate having a first surface and a second surface, a feeding structure mounting on the first surface and a rotation structure mounting on the second surface. Specifically, the feeding structure corresponds to the rotation structure for forming a resonant circuit.

Abstract: A cheaper to produce, smaller and easy to drive adaptive antenna module is presented. The module comprises a signal path, an antenna, and a tuning circuit with two variable impedance elements. The tuning circuit operates over a restricted range of impedances and maintains the series resonance characteristic of the antenna.

Abstract: A dual-band dielectrically loaded helical antenna for circularly polarised signals has two groups of helical antenna elements. In each group there are at least four such elements and they are connected at their distal ends to a respective feed coupling node and at their proximal ends to a common linking conductor. Each group includes pairs of neighbouring such antenna elements, each pair having one electrically short element and one electrically long element, and the arrangement of the elements is such that in each group the number of pairs in which, in a given direction around the core, the short element precedes the long element is equal to the number of pairs in which, in the same direction, the long element precedes the short element.

Abstract: An electronic device for processing radio frequency signals includes an antenna, an RF circuit, and a matching circuit. The matching circuit provides variable impedance between the antenna and the RF circuit. The antenna is capable of operating in a first frequency band or a second frequency band according to the variable impedance The matching circuit includes a first element; a second element; a first tuning cell connected to the first element and the second element, and comprising a first tuning element, a second tuning element and a first control element, the first control element determining whether to make a first node connected between the first and second tuning elements couple to a voltage level according to a first control signal; and a selecting circuit coupled to the first control element and configured to generate the first control signal so as to adjust the variable impedance.

Abstract: Output terminals (o1, o2) of a differentially excited transmitting circuit (TC) are connected through matching capacitors (MC1, MC2) to connecting terminals of the oscillatory circuit antenna (OCA) on the other side said connection terminals are directly connected to input terminals of a receiving circuit (RC). Each of the input terminals (i1, i2) of the receiving circuit (RC) is connected to an earthing terminal (m) of the integrated transceiver circuit (TRC) through a corresponding undervoltage-protection diode (UPD1, UPD2) determining a lower potential value of a received signal and a corresponding overvoltage-protection diode (OPD1, OPD2) determining an allowed upper potential value of the received signal exceeding said lower potential value by the highest possible voltage still allowable by the integrated transceiver circuit (TRC).

Abstract: A broadband power splitter and phase shifter having a plurality of transmission lines, a 3 db, zero degree power splitter for splitting a signal, an open quadrifilar spiral for receiving a first signal and reflecting power, a modified, open quadrifilar spiral for receiving a second output after a delay and for reflecting power, and wherein a difference between the reflected power from the open quadrifilar spiral and the modified, open quadrifilar spiral in conjunction with a delay provides a constant phase shift over a broad range of frequencies.

Abstract: The present invention relates to an RF antenna structure that includes a planar structure and a loading plate, such that the planar structure is mounted between a ground plane and the loading plate to form an RF antenna. The loading plate may be about parallel to the ground plane and the planar structure may be about perpendicular to the loading plate and the ground plane. The loading plate may allow the height of the RF antenna structure above the ground plane to be relatively small. For example, the height may be significantly less than one-quarter of a wavelength of RF signals of interest. The planar structure may include two conductive matching elements to help increase the bandwidth of the RF antenna structure.

Abstract: Disclosed is an antenna. The antenna includes a first radiating part bent in a predetermined direction, a second radiating part under the first radiating part, a conductive member connected to the second radiating part, and a coupling part spaced apart from the conductive member while surrounding a lateral side of the conductive member.

Abstract: A multiband antenna includes at least two antenna elements for use in a low frequency band and a high frequency band, a feeding point unit configured to be shared by both of the antenna elements for use in the low frequency band and the high frequency band and an impedance matching unit configured to be inserted into and connected to a position between an end of the antenna element for use in the high frequency band on the side of the feeding point unit and an open end thereof.

Abstract: A compacted patch antenna is described, particularly for installation in a vehicle, comprising an electrically supplied strip radiating element and a ground plane. The strip radiating element is connected to the ground plane at a first end by means of a metal link and at a second end, opposite to the first end, by means of a variable capacitor. The compacted patch antenna comprises a printed circuit, the bottom surface of which is integral with the ground plane, a dielectric material layer arranged between the strip radiating element and the printed circuit; the strip radiating element is substantially parallel to the ground mass. The dielectric material layer has a relative dielectric constant ranging between 3 to 6 with a loss factor ranging between 0.03 to 0.1.

Abstract: An apparatus including a wireless communications device has an internal antenna system located within the wireless communications device. The internal antenna system includes a passive antenna set comprising at least one antenna element having at least one multilevel structure, a feeding point to the at least one antenna element and a ground plane. The feeding point and a point on the ground plane define an input/output port for said passive antenna set. The passive antenna set provides a similar impedance level and radiation pattern at two or more frequency bands such that the passive antenna set is capable of both transmitting and receiving wireless signals on selected channels. The selected channels are selectable from a plurality of channels throughout an entire frequency range within each of said two or more frequency bands.

Abstract: The present invention provides a wireless communication device. The wireless communication device includes a mainboard and a connecting member, in which the mainboard includes a mainboard body and a mainboard end part which is connected to the connecting member; the side of the mainboard body away from the mainboard end part is connected to an antenna; and a matching network is arranged between the mainboard body and the mainboard end part and configured to control the distribution of the surface current induced by the antenna on the mainboard. By arranging the matching network between the mainboard body and the mainboard end part of the wireless communication device and changing, through the matching network, the distribution of the surface current induced by the antenna, the embodiments of the present invention may simultaneously guarantee the SAR performance and the wireless performance of a wireless communication terminal and improve the user experience.

Abstract: Disclosed herein is an antenna feed design for transmitting or receiving a circularly polarized microwave signal, and a communication device using that antenna feed design. Resonating disks are bowl-shaped to balance E-plane and H-plane magnetic field patterns, decreasing cross-polarization, and providing mechanical rigidity. A non-planar circuit replaces planar microstrip transmission lines for transmitting the signal, with 90° phase shifts, from an input point to excitation points. This non-planar circuit overcomes some of the layout problems encountered in planar circuits. It maintains impedance matching from the input point to the excitation points by progressively tapering down the characteristic transmission line impedance of each successive section. The non-planar circuit has sufficient mechanical strength and rigidity to allow it to be supported at only two anchor points. Similarly, the non-planar disks are also of sufficient strength to require only a single anchor point each.

Abstract: An antenna device includes: an antenna element that transmits or receives wireless signals in a predetermined first frequency band and in a second frequency band higher in frequency than the first frequency band; a feeding terminal portion; a first bandwidth adjustment circuit that includes a first capacitor for widening a bandwidth of the first frequency band to a predetermined bandwidth, the capacitance of the first capacitor being set at a predetermined value in accordance with the predetermined bandwidth; and a second bandwidth adjustment circuit that includes second and third capacitors and a first inductor for widening a bandwidth of the first frequency band to the predetermined bandwidth, the capacitance of each of the second and third capacitors and the inductance of the first inductor being respectively set at predetermined values in accordance with the predetermined bandwidth.

Abstract: A method and apparatus for reducing a length of an antenna (402) involves an arrangement which includes an orthogonal antenna feed. An antenna includes a radiating element (404) with a length extending along an axis (418). The orthogonal feed arrangement permits recovery of a portion of the spatial volume comprising the antenna which is normally used for antenna matching circuitry (406). An end portion of the radiating element is chosen to be helically shaped and includes an RF feed gap. The RF feed gap is coupled to a matching network which includes elongated conductors (412). The matching circuitry is positioned so that the elongated conductors are adjacent to the first end portion and extend in a direction aligned with the axis, but orthogonal to the coils forming the helically shaped end portion.

Abstract: In an antenna module, a main portion includes a plurality of insulating sheets made of a flexible material and laminated on each other. An antenna configured to transmit/receive a high-frequency signal is disposed in the main portion. A connection portion is disposed in the main portion and is connected to an electronic device that inputs/outputs the high-frequency signal. A signal transmission line is disposed in the main portion and has a strip line structure or a microstrip line structure to transmit the high-frequency signal. An impedance matching circuit is disposed in the main portion and between the antenna and end of a signal transmission line facing in a negative x direction. An impedance matching circuit is disposed in the main portion and between the connection portion and an end of the signal transmission line facing in a positive x direction.