Abstract: A radio-frequency module includes a mounting substrate, a transmission circuit element, and a reception circuit element. The mounting substrate has a first main surface and a second main surface. The transmission circuit element is provided on a signal path for a transmission signal of a first communication band. The reception circuit element is provided on a signal path for a reception signal of a second communication band. The second communication band is higher than the first communication band. The transmission circuit element is disposed on a same side of the mounting substrate as the first main surface of the mounting substrate. The reception circuit element is disposed on a same side of the mounting substrate as the second main surface of the mounting substrate.

Abstract: Techniques are disclosed for configuring a broadband antenna system. An example electronic device includes a first antenna operating at a first frequency range and coupled to a first transceiver via a first signal path comprising a first indirect feed. The electronic device also includes a second antenna operating at a second frequency range and coupled to a second transceiver via a second signal path comprising a second indirect feed, wherein the first frequency range is lower than the first frequency range. The electronic device also includes a third antenna operating at the second frequency range and coupled to a third transceiver via a second signal path comprising a third indirect feed. Additionally, the first antenna is coupled to the first antenna and the second antenna by a capacitive coupling element.

Abstract: A radio-frequency system including: a self-complementary antenna characterized by an input impedance substantially independent of signal frequency across an operational frequency band; a passive coupling device characterized by a characteristic impedance and configured to couple the self-complementary antenna to a signal generator and a set of signal processors; a resistive matching network electrically connected between the self-complementary antenna and the passive coupling device configured to match the characteristic impedance of the passive coupling device to the input impedance of the self-complementary antenna; and a back-coupling line characterized by a substantially constant group delay across the operational frequency band configured to electromagnetically couple the signal generator to the set of signal processors.

Abstract: An antenna structure includes first, second, and third radiators. The first radiator includes first, second, and third segments. One end of the first segment includes a signal feeding end. The second and third segments respectively extend in opposite directions from another end of the first segment. The second radiator includes a fourth segment, a fifth segment, and a sixth segment extending from an intersection of the fourth and fifth segments. The fourth segment includes a first ground end. The fifth segment includes a second ground end. A first slit is between the second and sixth segments; a second slit is between the third, fourth, and sixth segments. The third radiator includes seventh and eighth segments connected to each other in a bending manner. The seventh segment includes a third ground end. A third slit is between the first and seventh segments and between the third and eighth segments.

Abstract: A tunable resonant inductive coil system includes an electrical circuit having an alternating current (AC) voltage source, a barium strontium titanate (BST) variable capacitor coupled in series with a first terminal of the AC voltage source, a coil coupled in series with the BST variable capacitor, and a return line coupling the coil with a second terminal of the AC voltage source and/or a ground. The electrical circuit forms an LC circuit (resonant circuit). The electrical circuit adjusts between two configurations. In the first configuration the resonant circuit has a first resonant frequency configured for wireless power transfer and in the second configuration it has a second resonant frequency configured for near field communication (NFC). An entire length of the coil is used for both resonant frequencies. Adjusting between the first and second configurations includes varying a capacitance of the BST variable capacitor in response to receiving a control signal.

Abstract: An antenna package comprising a chip package including a plurality of feed lines, a first half antenna subassembly electrically coupled to the feed lines, and a second half antenna subassembly electrically coupled to the feed lines, wherein the first and second half antenna subassemblies point away from each other in a direction substantially perpendicular to the chip package. The antenna subassemblies may be millimeter (mm) wave antennas covering from approximately 24 to 43.5 GHz. The antenna subassemblies include a flex substrate formed from printed circuit boards (PCB) or flex-film PCB.

Abstract: Embodiments of the present disclosure disclose a terminal and a control method thereof. Cooperation between a target sensing object in the terminal and a target object to be sensed external to the terminal may affect a received signal on the target antenna loop, and control of the terminal may be implemented according to a change of the received signal. The method includes: detecting a received signal on a target antenna loop in the terminal and acquiring a signal parameter of the received signal; and determining whether the signal parameter of the received signal matches a preset target signal parameter, and triggering control of a to-be-controlled function of the terminal when the signal parameter of the received signal matches the preset target signal parameter.

Abstract: Techniques are provided to more accurately determine reflected power, reflection coefficient, and/or voltage standing wave to permit prompt protection of components such as power amplifiers and notify communication system operators. This is accomplished by more accurately determining an amplitude and phase of an output reflected signal at an output port of a bidirectional coupler as a function of the following: an amplitude and a phase of a coupled forward signal coupled into a forward coupled port of the bidirectional coupler; an amplitude and a phase of a coupled reverse signal coupled into a reverse coupled port of the bidirectional coupler; an electrical transmission parameter from an input port of the bidirectional coupler to the forward coupled port; an electrical transmission parameter from the input port to the reverse coupled port; and an electrical transmission parameter from an output port of the bidirectional coupler to the reverse coupled port.

Abstract: An improved architecture for a radio frequency (RF) power amplifier, impedance matching network, and selector switch. One aspect of embodiments of the invention is splitting the functionality of a final stage impedance matching network (IMN) into two parts, comprising a base set of off-chip IMN components and an on-chip IMN tuning component. The on-chip IMN tuning component may be a digitally tunable capacitor (DTC). In one embodiment, an integrated circuit having a power amplifier, an on-chip IMN tuner, and a selector switch is configured to be coupled to an off-chip set of IMN components. In another embodiment, an integrated circuit having an on-chip IMN tuner and a selector switch is configured to be coupled through an off-chip set of IMN components to a separate integrated circuit having an RF power amplifier.

Abstract: An antenna structure includes a metal mechanism element, a ground element, a feeding radiation element, a coupling element, a dielectric substrate, and a switchable circuit. The metal mechanism element has a slot. The feeding radiation element extends across the slot. A coupling gap is formed between the feeding radiation element and the coupling element. The feeding radiation element and the coupling element are disposed on the dielectric substrate. The switchable circuit includes a first metal element, a second metal element, a reactance element, a capacitor, and a diode. The first metal element is coupled to the coupling element. The reactance element is embedded in the first metal element. The second metal element is coupled through the capacitor to the ground element. The diode is coupled between the first metal element and the second metal element. The diode is turned on or off according to the control voltage difference.

Abstract: Various embodiments of the present technology relate generally to wireless power systems. More specifically, some embodiments relate to identifying and correcting failures within wireless power systems (or any other system that is subject to design/device fault). Some embodiments monitor multiple states/control signals in a wireless power transmission system having an array of antenna. A determination can be made as to whether each of the multiple states are in an expected configuration (or make the expected transitions implying different states during normal operations). For examples, this can include identifying whether each antenna in the array of antennas is in a transmitting or receiving state. Any problems (e.g., timing problems, antennas stuck in a Tx or Rx state, controller malfunction, etc.) within the system can be detected by analyzing the multiple states/control signals and compare them against expected behavior/configuration.

Abstract: An electronic device is provided. The electronic device includes an antenna radiator, a first feeding terminal configured to supply a first frequency band signal to the antenna radiator, a second feeding terminal configured to supply a second frequency band signal to the antenna radiator, and a plurality of grounds electrically connected with the antenna radiator. The first feeding terminal is connected with the antenna radiator and at least one of the plurality of grounds through a passive circuit including a plurality of electrical paths.

Abstract: A method of real-time impedance matching includes conveying a tool through a borehole where the tool includes a transmit cavity antenna and receive cavity antenna for transmitting and receiving signals through a subsurface formation. The tool also includes a cable for routing signals within the tool and at least one variable inductor or variable capacitor in an impedance-matching circuit. The method further includes measuring a reflection of a signal transmitted through the formation and determining a target impedance based on the impedance of the cable and the reflection. The method further includes adjusting the at least one variable inductor or variable capacitor such that the impedance of the matching circuit substantially equals the target impedance and receiving a signal from the formation via the adjusted impedance of the matching circuit.

Abstract: Detuning and isolation techniques for a multiband tunable matching network used in multi-transceiver RF systems. Embodiments include an amplifier and a multiband tunable matching network (MN) coupled to the amplifier. The multiband tunable MN is configured to detune to an isolation OFF state from an ON state, wherein the match tuning in the isolation OFF state is different than match tuning in the ON state. In an example detuning, the match tuning in the isolation OFF state is in a different frequency band than a frequency band of match tuning in the ON state and is selected based on the frequency band of match tuning in the ON state.

Abstract: In accordance with one or more embodiments, a communication device includes a dielectric antenna having a body of first dielectric material doped with particles of a second dielectric material. A cable comprising a dielectric core is coupled to a feed point of the dielectric antenna. A transmitter, coupled to the cable, facilitates a transmission of electromagnetic waves, the electromagnetic waves are guided by the dielectric core to the feed point of the dielectric antenna, without requiring an electrical return path.

Abstract: An apparatus comprises a radio frequency (RF) antenna circuit; an antenna aperture tuning circuit; an antenna impedance measurement circuit; and a processor circuit electrically coupled to the tunable antenna aperture circuit and the impedance measurement circuit. The processor circuit is configured to: set the antenna aperture tuning circuit to an antenna aperture tuning state according to one or more parameters of an RF communication network; initiate an antenna impedance measurement; and change the antenna aperture tuning state to an antenna aperture tuning state indicated by the antenna impedance.

Abstract: The present invention discloses an antenna and a terminal, which can extend antenna bandwidth. The antenna includes a capacitor component and at least one radiator, where one end of each radiator of the at least one radiator is connected to form a first node, the first node is connected to one end of the capacitor component to form a second node, and the second node is grounded; and the other end of the capacitor component receives a feed signal.

Abstract: A method and information handling system including a display device connector for connecting to a digital display device, a controller executing instructions of an impedance mismatch control system for determining impedance differences along an operative connection from the display device connector to the digital display device, where the controller receives a display device connector impedance measurement and a second impedance measurement from a point further along the operative connection between the display device connector and the digital display device, and the controller executes the impedance mismatch control system to determine an impedance mismatch exists from the impedance difference between the display device connector and the point further along the operative connection between the display device connector and the digital display device.

Abstract: A communication system is provided, including one or more antennas coupled to multiple RF paths, one or more matching blocks, each block including multiple matching networks, a look-up table including characterization data according to frequency bands and conditions, and a controller configured to control the multiple matching networks by referring to the look-up table to provide optimum impedance for a frequency band selected and a condition detected during a time interval. The matching block may further include switches and adjustment circuits.

Abstract: An antenna device includes an antenna element, a sensing circuit, a matching circuit and an impedance adjusting circuit. The sensing element is used to generate a sensing signal. The matching circuit is coupled to the antenna unit. The impedance adjusting circuit is coupled to the sensing circuit and is capable of turning an impedance of the antenna unit and an impedance of the matching circuit into mismatch according to the sensing signal.

Abstract: A high frequency band pass filter with a coupled surface mount transition is provided, including a filter substrate, circuit connection elements defining input and an output elements provided on a surface of the filter substrate, electronic filter components provided on the first surface of the filter substrate, and impedance matching structures provided on the first surface of the filter substrate between the electronic filter components and the respective input and output elements. Signal connection structures are provided on an opposed surface of the filter substrate, in locations that positionally correspond to respective positions of the input and output elements.

Abstract: An antenna assembly includes an antenna, a radio frequency (RF) unit, and a matching unit. The antenna includes a first radiator and a second radiator. The matching unit is electronically connected between the antenna and the RF unit, and includes a first matching circuit and a second matching circuit. The first matching circuit matches impedance of the first radiator, and the second matching circuit matches impedance of the second radiator.

Abstract: A communication system having self or internal calibration is disclosed. The system includes an antenna tuner, a mismatch component, a receiver, and a strength indicator. The antenna tuner is configured to mismatch an antenna according to a mismatch code. The mismatch code includes or alters antenna characteristics of the antenna. The mismatch component is configured to provide the mismatch code to the antenna tuner. The strength indicator is configured to measure a strength of the received signal.

Abstract: An antenna tuner control system includes an RF path, a lookup table and a state table analysis component. The RF path is configured to generate an RF signal. The lookup table has a state table that correlates antenna states with impedance values. The state table analysis component is configured to generate a tuner control signal from the RF signal using the lookup table.

Abstract: An embodiment of the present invention provides an apparatus, comprising a transceiver, an antenna tuner connecting said transceiver to an antenna, a power sensor adapted to acquire measurements about transmit power, a receive signal strength indicator (RSSI) adapted to acquire measurements about receive power and wherein said tuner tunes said antenna based upon said transmit and receive measurements to optimize said antenna in both the receive and transmit bands.

Abstract: A multiple-reflector antenna for telecommunications satellites including a shaft, to which are attached at least two sub-reflectors, rotating in relation to a load-bearing structure, and a motor including a rotor able to drive the shaft in rotation, and a stator attached to the load-bearing structure, wherein the multiple-reflector antenna also includes two bearings enabling the shaft to rotate in relation to the load-bearing structure, a torsionally rigid mechanical filter placed between the shaft and the rotor, enabling the rotor to transmit the rotational movement to the shaft, and able to dampen the stresses generated by the shaft on the motor, and locking means able to hold the angular position of the shaft in relation to the load-bearing structure.

Abstract: An automatic antenna impedance matching method for a radiofrequency transmission circuit. An impedance matching network is inserted between an amplifier and an antenna. The output current and voltage of the amplifier and their phase difference are measured by a variable measurement impedance, and the complex load impedance of the amplifier is deduced from this; the impedance of the antenna is calculated as a function of this complex impedance and as a function of the known current values of the impedances of the matching network. Starting from the value found for the impedance of the antenna, new values of the matching network are calculated that allow the load to be matched to the nominal impedance of the amplifier. The measurement impedance has a value controllable by the calculation processor according to the application and notably as a function of the operating frequency and of the nominal impedance of the amplifier.

Abstract: An electronic device may include an adjustable power supply, at least one antenna, and associated antenna tuning circuitry. The antenna tuning circuitry may be an integral part of the antenna and may include a control circuit and at least one tunable element. The tunable element may include radio-frequency switches, continuously/semi-continuously adjustable components such as tunable resistors, inductors, and capacitors, and other load circuits that provide desired impedance characteristics. The power supply may provide power supply voltage signals to the antenna tuning circuitry via inductive coupling. The power supply voltage signals may be modulated according to a predetermined lookup table during device startup so that the control circuit is configured to generate desired control signals. These control signals adjust the tunable element so that the antenna can support wireless operation in desired frequency bands.

Abstract: Methods for generating a look-up table relating a plurality of complex reflection coefficients to a plurality of matched states for a tunable matching network. Typical steps include measuring a plurality of complex reflection coefficients resulting from a plurality of impedance loads while the tunable matching network is in a predetermined state, determining a plurality of matched states for the plurality of impedance loads, with a matched state determined for each of the plurality of impedance loads and providing the determined matched states as a look-up table. A further step is interpolating the measured complex reflection coefficients and the determined matching states into a set of complex reflection coefficients with predetermined step sizes.

Abstract: Electronic devices may be provided that contain wireless communications circuitry. The wireless communications circuitry may include radio-frequency transceiver circuitry coupled to an adjustable antenna. The adjustable antenna may contain conductive antenna structure such as conductive electronic device housing structures. Electrical components such as switches and resonant circuits may be used in configuring the antenna to operate in two or more different antenna modes at different respective communications bands. Control circuitry may be used in controlling the switches. The antenna may be configured to operate as an inverted-F antenna in one mode of operation and a slot antenna in a second mode of operation.

Abstract: An electronic device includes an antenna, an RF circuit, and a matching circuit. The matching circuit is configured to provide variable impedance between the antenna and the RF circuit, wherein the matching circuit includes a first element having a first terminal and a second terminal, and wherein the first terminal is coupled to the antenna; a second element having a third terminal connected to the second terminal of the first element and a fourth terminal coupled to the RF circuit; a first tuning cell connected to the second terminal of the first element and the third terminal of the second element, and comprising a first tuning element, a second tuning element and a first control element, wherein the first control element determines whether to make a first node connected between the first and second tuning elements couple to a voltage level.

Abstract: An antenna structure includes a feeding portion, a grounding portion, a first radiating body, a second radiating body, a first coupling portion and a second coupling portion. The first radiating body is electronically coupled to the grounding portion and the feeding portion. The second radiating body is positioned apart from the first radiation body. The first coupling portion is electronically coupled between the first radiating body and the second radiating body. The second coupling portion faces the first coupling portion and is electronically coupled between the first and second radiating bodies. The first and second radiating bodies, and the first and second coupling portions cooperatively define a loop antenna.

Abstract: A transfer unit for transferring a radio frequency signal between a classical antenna tuner and an antenna where the transfer unit comprises a switch for alternatively selecting a first direct route for the radio frequency signal between the tuner and the antenna or a second route via a reactive element; said reactive element comprising a variable serial capacitance and a shunt inductance connected to system earth; and where a control unit controls the switch and is adapted to select the first route when the frequency is above a predetermined value and otherwise select the second route. The variable serial capacitance comprises a set of capacitors organized as a set of binary weighted parallel capacitance values, and the transfer unit further comprises switches to engage or disengage each capacitor from the reactive element to increase or decrease the resulting capacitance as the radio frequency is decreased or increased.

Abstract: Electronic devices may be provided that contain wireless communications circuitry. The wireless communications circuitry may include radio-frequency transceiver circuitry coupled to an adjustable antenna. The adjustable antenna may contain conductive antenna structure such as conductive electronic device housing structures. Electrical components such as switches and resonant circuits may be used in configuring the antenna to operate in two or more different antenna modes at different respective communications bands. Control circuitry may be used in controlling the switches. The antenna may be configured to operate as an inverted-F antenna in one mode of operation and a slot antenna in a second mode of operation.

Abstract: An antenna structure includes a monopole antenna, a short parasitic antenna and an impedance matching circuit. The monopole antenna includes a first radiating body, a second radiating body and a feeding portion coupled to the first radiating body and the second radiating body. The first radiating body configured to excite a low-frequency resonating mode; the second radiating body configured to excite a first high-frequency resonating mode. The short parasitic antenna includes a parasitic body spaced apart from the second radiating body and a grounding portion coupled to the parasitic body. The short parasitic antenna configured to excite a second high-frequency resonating mode, and resonate with the second radiating body to excite a third high-frequency resonating mode. The impedance matching circuit includes a variable capacitor configured to regulate operating frequency band of the low-frequency resonating mode.

Abstract: There is provided a radio device including an antenna, a first impedance converting circuit, a second impedance converting circuit and a differential output unit. The antenna has a first terminal and a second terminal to receive a signal. The first impedance converting circuit and the second impedance converting circuit have a first impedance and a second impedance, respectively. The first impedance and the second impedance each are controllable. One end of the first impedance converting circuit and one end of the second impedance converting circuit are connected to the first terminal and the second terminal of the antenna, respectively. The differential output unit is connected to the other end of the first impedance converting circuit and the other end of the second impedance converting circuit through which the signal received by the antenna is input to the differential output unit, and transform the signal into a differential signal.

Abstract: An antenna structure includes a feed end, a first ground end, a first antenna, a second ground end, a second antenna, and a holder. The first antenna is connected to the feed end and the first ground end. The second antenna is a parasitic antenna, the second antenna is connected to the second ground end, and is opposite to the first antenna. The holder is connected between the first antenna and a second antenna.

Abstract: Embodiments relate to systems and methods for a frequency reconfigurable filtenna system. Implementations incorporate a reconfigurable band-pass filter within the feeding line of an antenna structure. The combination of the filter and the antenna may be referred to as a “filtenna”. Implementations integrate both the band-pass filter and the antenna within the same substrate, permitting easier, more efficient and more compact integration in the transceiver hardware. Moreover, by using this configuration, the biasing of the switching elements are not present in the radiating plane of the antenna. This reduces the negative effect of the biasing lines on the antenna radiation performance, as we!! as provides a tunable filtered antenna radiation characteristic.

Abstract: The invention relates to aerial technology and can be used as a compact reconfigurable aerial for long-wave, medium-wave and short-wave communications. An aerial with an impedance corrector, consisting of an inductance coils, comprises a flat or three-dimensional vibrator. The vibrator is arranged in the magnetic field of the impedance corrector, which is in the form of a transformer. The transformer is arranged on an open core of a magnetic conductor. The vibrator is electrically connected to a secondary winding of the transformer. The transformer has a variable coefficient of transformation. The magnetic conductor is manufactured from a mixture of particles of ferro-magnetic material and a non-magnetic binder. The technical result is an increase in the maximum power of the resonant aerial and the possibility of reconfiguring the working frequency thereof within a wide range of radio waves and, as a consequence, extending the functional possibilities of using a transceiver.

Abstract: An embodiment of the present disclosure provides an impedance matching circuit including a matching network. The matching network includes a first port and a second port, and one or more variable reactance components. The one or more variable reactance components are operable to receive one or more variable voltage signals to cause the one or more variable reactance components to change an impedance of the matching network. At least one of the one or more variable reactance components includes a first conductor coupled to one of the first port or the second port of the matching network, a second conductor, and a tunable material positioned between the first conductor and the second conductor. Additionally, at least one of the first conductor and the second conductor are adapted to receive the one or more variable voltage signals to cause the change in the impedance of the matching network. Additional embodiments are disclosed.

Abstract: An antenna device of an embodiment includes: an antenna; a variable impedance matching circuit that is connected to the antenna; a probe that receives power from the antenna; a power detector that is connected to the probe; a control circuit controlling the variable impedance matching circuit based on a value of power measured by the power detector; a first arithmetic circuit calculating a variation in the value of power measured by the power detector; a comparator circuit that compares the variation with a predetermined numerical value range; and a starter circuit that activates the control circuit based on a result of the comparison performed by the comparator circuit.

Abstract: A mobile device includes a dielectric substrate, a ground plane, an RF (Radio Frequency) module, an antenna structure, a bypass inductor, matching circuits, and a switch circuit. The antenna structure includes a first radiation element and a second radiation element. The first end of the first radiation element is connected to the RF module, and the second end of the first radiation element is open. The second radiation element is separate from the first radiation element. The first end of the second radiation element is open and adjacent to the first radiation element, and the second end of the second radiation element is connected through the bypass inductor to the ground plane. The switch circuit selects one of the matching circuits according to a control signal. The second end of the second radiation element is further connected through the selected matching circuit to the ground plane.

Abstract: The present subject matter relates to filtering antenna devices, systems, and methods in which a tunable antenna having one or more first variable impedance element is configured to selectively vary an impedance at a signal path output and a tunable filter is in communication between the signal path output of the tunable antenna and a signal processing chain. The tunable filter can have one or more second variable impedance element configured to provide a frequency-selective filtering response between the signal path output and the signal processing chain. A controller in communication with both the tunable antenna and the tunable filter can be configured for selectively tuning an impedance value of one or more of the one or more first variable impedance element or the one or more second variable impedance element.

Abstract: The invention relates to a system comprising an array of two or more receiving antennas (11, 12, 13) for receiving RF signals, each receiving antenna being connected, via a matching network (19, 20, 21), to a low-noise amplifier (22, 23, 24) presenting an input impedance to the matching network (19, 20, 21), each chain consisting of a receiving antenna (11, 12, 13), a matching network (19, 20, 21) and a low-noise amplifier (22, 23, 24) constituting a part of a receiving channel of the system, the matching networks (19, 20, 21) transforming optimum impedances of the low-noise amplifiers (22, 23, 24), the optimum impedances providing optimum noise performance of the low-noise amplifiers (22, 23, 24), wherein each receiving channel comprises at least one switchable impedance (28, 29, 30) at the input of each low-noise amplifier (22, 23, 24) for switching the input impedance as presented to each matching network (19, 20, 21) to a value being the complex conjugate of the optimum impedance of the respective low-noi

Abstract: The present invention provides an antenna impedance matching apparatus, semiconductor chip, and method. The apparatus includes: a semiconductor chip, including multiple adjustable capacitors and multiple switches; and at least one impedance component, located outside the semiconductor chip, where the semiconductor chip is coupled to the at least one impedance component through multiple terminals and coupled to an input terminal and an output terminal of the antenna impedance matching apparatus, the input terminal and the output terminal of the antenna impedance matching apparatus are respectively coupled to a radio frequency circuit and an antenna, the multiple switches are configured to, under control of a control signal, switch a connection between the multiple adjustable capacitors and the at least one impedance component, and values of the multiple adjustable capacitors are adjusted by an adjustment signal, so as to tune impedance matching of the antenna.

Abstract: Discussed herein is an antenna system that comprises a feed element and a radiating element that are formed on a dielectric substrate positioned above a circuit board which includes a feed circuit and a ground layer. Specifically, the feed element is disposed within an outer periphery defined by the radiating element. A capacitive coupling is formed between the feed element and the radiating element. With the aforesaid configuration, the antenna system is less affected by the circuit board and interference from other elements that are mounted on the circuit board. Further, manufacturing costs are reduced as compared to the case where the feed element and the radiating element are respectively formed on a front and rear surface of a resin layer.

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.

Abstract: Tunable duplexers and related methods are disclosed for use in communications networks. A tunable radiating duplexer can include a first antenna comprising a first variable capacitor and a second antenna comprising a second variable capacitor.

Abstract: A present invention relates to a monopole wideband antenna, that is a wall mounted handing type antenna capable of providing easy frequency adjustment and operating at broad frequency band range. Moreover, the monopole wideband antenna of the invention can be applied in various electronic devices, and is advantageous in its low cost and small size since it can be fabricated directly using a means of print formation upon a circuitboard.

Abstract: Disclosed is an antenna feeding system and method to optimize the design of the feeding system to feed an antenna made of a resistive sheet. The system and method are operative to design a topology of the antenna feeding system to adapt to a topology of the resistive sheet antenna to mitigate the adverse effects caused by the inherent losses of resistive sheets while operating as antennas. The system is designed to reduce a convergence of radiofrequency currents that may create a localized high density current concentration, such as “hot spots” and “pinch points,” on the resistive sheet, by a sufficient extent so as to prevent power losses that substantially decrease the radiation efficiency of the antenna as compared with feeding systems designed using traditional design techniques.