Abstract: Provided is a high frequency module capable of reducing the IMD. During the transmission/reception operation based on W-CDMA, control signals VSWCC, VTRXCC are output as Hi signals from a control logic. Consequently, transistor T1 is turned ON, and transistors T2, T3 are respectively turned OFF. When the transistor T1 is turned ON, the voltage output from an operational amplifier is output as the signal VVSW to a control terminal, and the control signal VTRXC is output as a Hi signal. The signal VVSW is of a voltage level that is lower than that of the control signal VTRXC. The control signal VTRXC is a signal for turning ON a transistor circuit Q1, and the signal VVSW is a signal for supplying a DC voltage to the antenna potential. It is thereby possible to reduce the ON resistance of the transistor circuit Q1 and improve the IMD characteristics.

Abstract: Antenna structures and methods of operating the same of an electronic device are described. One apparatus includes an antenna structure comprising four antenna elements, a RF circuit, and a MIMO RF circuit coupled between the antenna structure and the RF circuit. The MIMO RF circuit may include a pair of diplexers; and a pair of switches. The RF circuit is operable to cause a first antenna element of the four antenna elements to radiate and receive electromagnetic energy in a first frequency range via the MIMO RF circuit and the RF circuit is operable to cause a remaining three antenna elements of the four antenna elements to receive electromagnetic energy in the first frequency range via the MIMO RF circuit to support 4×4 DL MIMO.

Abstract: A transceiver or RF front end employing a transformer with a low loss transmit/receive (T/R) switch circuit in the ground path. In various embodiments, differential outputs of a power amplifier are coupled to the first winding of the transformer, while the input of a low noise amplifier is coupled to the second side of the transformer via a matching inductor. The T/R switch circuit, which may be a thin oxide CMOS transistor, is coupled between the second side of the transformer and ground. In operation, the T/R switch circuit may be enabled during transmit mode operations of the power amplifier, such that a low impedance path to ground is provided at the input of the low noise amplifier, thereby protecting it from high voltage swings generated by the power amplifier.

Abstract: Technologies described herein are directed to switching between antennas in response to a change in an isolation value identified using a neutralization line. A device may include a first set of antennas including a first antenna, a second antenna, a neutralization line coupled between the first antenna and the second antenna, and a controller. The controller is coupled to the neutralization line. The controller determines a first isolation value between the first antenna and the second antenna using the neutralization line, determines a change in isolation value between the first antenna and the second antenna to a second isolation value, determines that the second isolation value exceeds a threshold, and switches from using the first set of antennas to using a second set of antennas.

Abstract: A diverse radio receiver system includes a radio frequency (RF) circuit board, a plurality of RF receivers disposed on the RF circuit board, and switching circuitry disposed on the RF circuit board. The switching circuitry includes transmission lines and switches connecting each RF receiver with (1) a selected one antenna of a plurality of antennas and (2) an impedance matching circuit providing impedance matching of the selected one antenna with the RF receiver. The switching circuitry is configured to implement a plurality of selectable switch configurations, each switch configuration connecting each RF receiver of the plurality of RF receivers with a selected antenna of the plurality of antennas. The impedance matching circuits of the switching circuitry may comprise impedance matching transmission line stubs. The diverse radio receiver system may be configured to receive an RF signal transmitted by a wireless magnetic resonance (MR) receive coil.

Abstract: A wireless terminal with a reduced Specific Absorption Rate (SAR) peak value and a method for reducing an SAR peak value by using the wireless terminal are disclosed. The wireless terminal with a reduced SAR peak value includes a first antenna configured to receive or transmit a communication signal, and further includes: a second antenna configured to feed a coupling signal when the first antenna receives or transmits the communication signal, and a signal processing module configured to process the coupling signal to reduce an SAR peak value of the communication signal for a human body. The energy of a superposed signal in a human body orientation is reduced by superposing the coupling signal with the communication signal, so as to reduce the SAR peak value effectively.

Abstract: A filter circuit includes an antenna-side circuit, a transmission-side circuit, a reception-side circuit, and an external connection capacitor. The antenna-side circuit is connected to an antenna-side terminal. The transmission-side circuit is connected to a transmission-side terminal and the antenna-side circuit. The reception-side circuit is connected to a reception-side terminal, the antenna-side circuit, and ground. The external connection capacitor is connected between an external control terminal and a connection point between the antenna-side circuit and the reception-side circuit. The antenna-side circuit and the transmission-side circuit constitute a low pass filter. The antenna-side circuit and the reception-side circuit constitute a band pass filter. The reception-side circuit includes an LC parallel resonant circuit.

Abstract: A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus is embodied in a device that determines a first set of antenna weights for communicating a first communication ray, detects a change in a physical orientation of the device, determines a mapping between the first set of antenna weights, the detected change in the physical orientation, and a second set of antenna weights for communicating a second communication ray, communicates the second communication ray based on the second set of antenna weights.

Abstract: An information exchange method includes steps of shaking a first electronic device and a second electronic device simultaneously; recording a first vibration waveform of the first electronic device and recording a second vibration waveform of the second electronic device; determining whether the first vibration waveform and the second vibration waveform match each other; and transmitting a first information related to the first electronic device to the second electronic device when the first vibration waveform and the second vibration waveform match each other.

Abstract: An apparatus for use in a mobile device includes a switch unit configured to switch a common connection of a transmitter and a first receiver from a first antenna to a second antenna and a connection of a respective second receiver from the second antenna to the first antenna; and a processing system configured to detect a switch condition that the transmitter needs to transmit via the second antenna, obtain power-related reception parameters of said first and said second receivers, cause the switch unit to switch the common connection of the transmitter and the first receiver so that the transmitter transmits via the second antenna, and adjust the power of the transmitter in dependence on the power-related reception parameters.

Abstract: A FET-based RF switch architecture and method that provides for independent control of FETs within component branches of a switching circuit. With independent control of branch FETs, every RF FET in an inactive branch that is in an “open” (capacitive) state can be shunted to RF ground and thus mitigate impedance mismatch effects. Providing a sufficiently low impedance to RF ground diminishes such negative effects and reduces the sensitivity of the switch circuit to non-matched impedances.

Abstract: A filter circuit includes: a first band-pass filter, a second band-pass filter, a third band-pass filter and a fourth band-pass filter each having input and output terminals; a first terminal to which one of input and output terminals of first band-pass filter and one of input and output terminals of second band-pass filter are connected; a second terminal to which one of input and output terminals of third band-pass filter and one of input and output terminals of fourth band-pass filter are connected; a third terminal to which another one of input and output terminals of first band-pass filter and another one of input and output terminals of fourth band-pass filter are connected; and a fourth terminal to which another one of input and output terminals of second band-pass filter and another one of input and output terminals of third band-pass filter are connected.

Abstract: This disclosure provides systems, methods, and apparatus for mobile transmit diversity. In one aspect, a wireless communication apparatus is provided. The wireless communication apparatus includes a transmit circuit configured to transmit wireless communications via either a first antenna or a second antenna. The wireless communication apparatus further includes a receive circuit configured to receive wireless communications using either the first antenna or the second antenna.

Abstract: Disclosed herein is a front module having a triplexer. According to a preferred embodiment of the present invention, the front module includes: a triplexer receiving and distributing a MoCA receiving signal and a cable broadcasting signal from a coaxial cable and receiving the MoCA transmitting signal and outputting the received MoCA transmitting signal to the coaxial cable; a transceiver for MoCA removing and outputting noise from the MoCA receiving signal input through the triplexer and amplifying the MoCA transmitting signal input from the outside and providing the amplified MoCA transmitting signal to the triplexer; and a receiver for cable removing and outputting noise from the cable broadcasting signal input through the triplexer.

Abstract: A front end circuit for coupling a plurality of antennas to a multi-channel time domain duplex RF transceiver is disclosed. The front end circuit has a first transmit port, a first receive chain primary port, a first receive chain secondary ports, and a first antenna port connectible to a first one of the plurality of antennas. The front end circuit also has a second transmit port, a second receive chain primary port, and a second receive chain secondary port connectible to a second one of the plurality of antennas. A first switch has terminals connected to the first transmit port, the first receive chain primary port, and the second receive chain secondary port, as well as a common terminal that is connected to the first antenna port. Additionally, the front end circuit has a second switch that has terminals connected to the second transmit port, the second receive chain primary port and the first receive chain secondary port, and a common terminal connected to the second antenna port.

Abstract: In an RF transceiver front-end device that operates in a receiving mode, a first transformer circuit generates, based on an external RF signal received by an antenna, a first induction signal that passes through a switch unit, and that is amplified by a low noise amplifier circuit and then demodulated by a demodulation circuit to thereby generate a reception signal. When the RF transceiver front-end device is in a transmitting mode, a power amplifier circuit generates, based on a modulated signal generated by a modulation circuit through modulation of an external transmission signal, an amplified output. A second transformer circuit then generates, based on the amplified output, a second induction signal that is thus radiated by the antenna.

Abstract: A proximity wireless transmission/reception device of an embodiment includes a first transmission/reception unit, of a first communication scheme, including a first tuned circuit and a first modulation/demodulation circuit, a second transmission/reception unit, of a second communication scheme, including a second tuned circuit and a second modulation/demodulation circuit, an antenna where communication signals of the first and second communication schemes are induced, a switch unit configured to connect the antenna and the first transmission/reception unit or to connect the antenna and the second transmission/reception unit, a reception determination unit configured to determine reception states of the first and second transmission/reception units, and a switch switching unit configured to control the switch unit according to a determination result of the reception determination unit.

Abstract: A circuit comprises a transmitter to provide a transmit signal. The circuit also comprises a coupler element to receive the transmit signal at an input port, to provide a first representation of the transmit signal at an antenna port and a second representation of the transmit signal at a testing port. The circuit further comprises a monitoring receiver unit. The monitoring receiver unit is coupled to the testing port. Furthermore, the monitoring receiver unit is configured to determine a characteristic of the second representation of the transmit signal.

Abstract: A high frequency semiconductor switch has a first terminal, second terminals, a first through FET group, second through FET groups and a shunt FET group. The first through FET group has first field effect transistors connected serially with each other. One end of the first through FET group is connected to the first terminal. Each of the second through FET groups has second field effect transistors connected serially with each other. One end of each of the second through FET groups is connected to each of the second terminals. The other end of each of the second through FET groups is commonly connected to the other end of the first through FET group. The shunt FET group has third field effect transistors connected serially with each other between the second terminal and a ground terminal.

Abstract: An electronic circuit includes: a switch that includes ports, and selects a port to be connected to an antenna from among the ports; a first filter connected between a first port and a first terminal, and having a pass band which overlaps with a transmission band of a first band; a second filter connected between a second port and a second terminal, and having a pass band which overlaps with a transmission band of a second band; a third filter connected between a third port and a third terminal, and having a pass band which overlaps with reception bands of the first and the second bands; wherein when a signal in the first band is transmitted and received, the switch selects the first and the third ports, and when a signal in the second band is transmitted and received, the switch selects the second and the third ports.

Abstract: A long-wave or medium-wave receiver receives a first signal from a first terminal of a loopstick antenna on a positive antenna input terminal of the receiver and receives a second signal from a second terminal of the loopstick antenna on a negative antenna input terminal of the receiver. The first and second signals are processed differentially in the receiver. The receiver may optionally be configured to operate in either a differential mode or a single-ended mode by setting switches to selectively connect one of the antenna input terminals to ground in single-ended mode.

Abstract: To realize an optimal power-on reset in a system in which the rise of the power supply voltage is sharp. A semiconductor device according to the present invention includes two diodes connected in parallel between power supplies, and a resistor circuit and a capacitance element connected in parallel between one power supply and each of the two diodes, and outputs a comparison result between voltages outputted from the two resistor circuits as a reset signal.

Abstract: A digital video broadcast receiver including a frequency synthesizer, a plurality of frequency dividing-phase shifting circuits, an antenna and a plurality of signal processing modules is provided. The frequency synthesizer synthesizes a first frequency signal. The frequency dividing-phase shifting circuits individually perform a frequency dividing-phase shifting operation on the first frequency signal to generate a plurality of first signals having different frequencies and a plurality of second signals corresponding to the first signals, where each of the first signals is orthogonal to the corresponding second signal. The antenna receives a radio frequency signal. The signal processing modules respectively obtain a plurality of signal components belonging to different sub-bands from the radio frequency signal according to the first signals and the second signals.

Abstract: Provided in the disclosure is a dual-mode mobile terminal. The dual-mode mobile terminal includes: a CMMB antenna embedded in the dual-mode mobile terminal; a CMMB protection network connected to the CMMB antenna, comprising multiple stages of circuits connected successively, wherein each stage of circuit in the multiple stages of circuits is an LC series circuit or an LC parallel circuit, two ends of the LC parallel circuit are connected between the stages of circuits before and after the LC parallel circuit, and one end of the LC series circuit is connected between the stages of circuits before and after the LC series circuit, and the other end of the LC series circuit is grounded. According to the technical solution provided by the disclosure, the interference problem among multiple antennas in the CMMB antenna embedding solution in the related art is solved, thus being able to reduce the interference to CMMB signals by multi-mode radio frequency signals.

Abstract: The invention provides an antenna switching method for a wireless communication apparatus. The wireless communication apparatus includes a first antenna, a second antenna, a first modem, a switch, and a second modem. The first modem generates a control signal; the switch is coupled to the first antenna, the second antenna, the first modem, and the second modem. The switch receives the control signal and performs switching according to the control signal to make the first antenna to be coupled to one of the first modem and the second modem, and to make the second antenna to be coupled to the other one of the first modem and the second modem.

Abstract: A high-frequency module includes a switch IC and a matching circuit. The high-frequency module includes a multilayer body. The switch IC and an inductor of the matching circuit are mounted on a top surface of the multilayer body. A top-surface land electrode on which a common terminal of the switch IC is mounted is connected to one end of a wiring conductor through a via-conductor. The other end of the wiring conductor is connected to a top-surface land electrode on which a terminal electrode at one end of the inductor is mounted, through a via-conductor. An end portion of the inductor on the side connected to the common terminal of the switch IC is disposed near the common terminal. Thus, the length of the wiring conductor is shortened and a parasitic capacitance is decreased.

Abstract: An active antenna transceiver system is disclosed. The active antenna transceiver system comprises a bandpass filter adapted to filter first telecommunication signals in a first frequency band, the first telecommunication signals being transceived in a first antenna section, an active transceiver arrangement adapted to transceive second telecommunications signal in a second frequency band, an antenna arrangement adapted to radiate and/or collect signal in both the first and second frequency bands. A combining element is provided for combining first telecommunications signal and second telecommunication signal into a combined telecommunications signal to be fed into antenna arrangement and the combining element being adapted for splitting the combined telecommunications signal from the antenna arrangement into first telecommunication signals and second telecommunications signals.

Abstract: A low noise amplifier is disclosed. The low noise amplifier comprises a current mirror circuit, a bias circuit, a cascode amplifying circuit and a power gain compensating circuit. The current mirror circuit is used for providing a mapping current. The bias circuit is used for receiving a mapping current and outputting a first bias voltage and a second bias voltage according to the mapping current. The cascode amplifying circuit respectively receives the first bias voltage and the second bias voltage, and accordingly to work at an operation bias point. The power gain compensating circuit is used for receiving a RF output signal and accordingly outputs a gain compensating signal to the current mirror circuit so as to dynamically adjust current value of the mapping current and further to compensates power gain of the low noise amplifier in order to increase linearity.

Abstract: A system that includes an amplification circuit; a resonant circuit that is arranged to receive the amplified signal and to output an resonant circuit output signal; wherein the resonant circuit comprises a continually tuned variable capacitor; a transformer that is arranged to receive the resonant circuit output signal and to output a transformer output signal; a coupler that is arranged to sample the transformer output signal and a reflected signal and to output a first signal that represents the transformer output signal and a second signal that represents a reflected signal; a detector that is arranged to receive the first and second signals and to output an impedance indicative signal a control circuit that is arranged to generate the resonant circuit tuning signal in response to the impedance indicative signal and for compensating for the impedance mismatch.

Abstract: A radio frequency (RF) communication device comprises a first signal propagating circuit and a second signal propagating circuit, which together enables simultaneous transmission. The first signal propagating circuit is configured with a first tunable notch filter within a first transmit path and the second signal propagating circuit is configured with a second tunable notch filter within a second transmit path. A controller is communicatively coupled to a respective first tuning component and second tuning component of the tunable notch filters. The controller selectively tunes at least one of the tunable notch filters during signal propagation to produce a specific combined notch filtering response that reduces a level of IMD on at least one receive carrier frequency of at least one propagating signal. Aspects of the disclosure also provide a method for making the communication device.

Abstract: Electronic devices may be provided with near field communications capabilities. A near field communications antenna may be formed from multiple inductive components. The inductive components may include a speaker coil. One or more switches may be provided in the near field communications antenna to adjust the inductance of the near field communications antenna during different modes of operation. An audio circuit may be used to generate audio signals. A first transmitter may be used to transmit near field hearing aid signals through the near field communications antenna. A second transmitter may be used to transmit near field communications signals to external equipment such as near field communications point of sale equipment. Switching circuitry may be used to selectively couple the audio circuit, the first transmitter, and the second transmitter to the near field communications antenna.

Abstract: An integrated circuit includes a node coupled between a terminal of the integrated circuit and a transmitter circuit. The integrated circuit includes a switch circuit coupled between the node and a receiver circuit. The switch circuit includes a bias circuit coupled to the node. The bias circuit is configured to provide a first bias voltage to the node in response to an indication of a transmit mode of the terminal. The bias circuit is configured to provide a second bias voltage to the node in response to an indication of a receive mode of the terminal. The switch circuit may include a plurality of n-type devices coupled in series. Each of the plurality of n-type devices may include a triple-well, doubly-floating n-type device. The plurality of n-type devices may include a resistively-biased bulk terminal and a resistively-biased n-well.

Abstract: A circuit comprises a transmitter port; a receiver port; an antenna port configured to transmit a signal from the transmitter port to antenna port and receive a signal at antenna port and pass to the receiver port; and a switch configured to switch whether the transmitter port or the receiver port is communicatively coupled to the antenna port. The switch comprises a plurality of NMOS FETs configured to switch between the transmitter port and the receiver port.

Abstract: An RF unit receives predetermined signals. The RF unit amplifies the received signals. A gain control unit controls the gain at the RF unit based on the amplified signal and has the RF unit use the controlled gain. The gain control unit performs different controls on the received signals, depending on the case when the received signal is a known signal placed in the beginning of packet signal and the case when the received signal is a signal other than the packet signal.

Abstract: An apparatus for wirelessly transmitting information includes a transmitting/receiving unit and an antenna unit. An electrical signal path is between the transmitting/receiving unit and the antenna unit. A front-end module contains at least one duplexer and is electrically connected into the signal path between the transmitting/receiving unit and the antenna unit. A detector unit is used for detecting signals proportional to radio-frequency signals propagating in the signal path. The detector unit is electrically coupled to the signal path between the transmitting/receiving unit and the front-end module.

Abstract: A signal transceiver includes a first power amplifier coupled to a chip output port of a chip; an impedance transforming circuit; a switching circuit arranged to selectively couple the chip output port to a first port of the impedance transforming circuit; and a receiving amplifier coupled to a second port of the impedance transforming circuit.

Abstract: A switchable diplexer includes a plurality of bandpass filters having passbands for the frequency bands in which communication across a communication channel is desired. The bandpass filters can be arranged in groups of bandpass filters located adjacent to one another physically. Further, a group of bandpass filters can include a plurality of bandpass filters having a stop band in a common frequency range of interest. A plurality of switches can be provided to switch the desired bandpass filter into the circuit to allow communication on its corresponding band. The switches can therefore be electrically coupled to the passband filters and configured to select one of the plurality of bandpass filters for signal communication on the communication channel.

Abstract: There is provided a high frequency switch which is satisfactory in terms of both insertion loss characteristics and harmonic characteristics. The high frequency switch includes: a common port outputting a transmission signal to an antenna; a plurality of transmission ports each having the transmission signal input thereto; and a plurality of switching units each connected between the plurality of transmission ports and the common port to conduct or block the transmission signal from each of the transmission ports to the common port, wherein each of the switching units includes a plurality of series-connected MOSFETs formed on a silicon substrate, the plurality of MOSFETs are any one of body contact-type FETs and floating body-type FETs, and each of the switching units includes both of the body contact-type FETs and the floating body-type FETs.

Abstract: A wireless communications device includes multiple switchable antenna elements that may be used to improve interfacing of the wireless communications device with other devices, such as for interfacing of an RFID-equipped mobile communications device with other RFID devices (e.g., to better ensure power delivery to and/or communication with such other RFID devices) and/or may be used to characterize various aspects of the environment around the wireless communications device, such as for proximity-based functionality.

Abstract: Disclosed is a radio-frequency front-end apparatus that can be used in wireless communication systems performing transmission/reception by using a single antenna. The radio-frequency transceiving front-end apparatus using passive elements in a wireless communication system includes: a transmitting unit's hybrid coupler configured to divide and output a transmission signal into two outputs having a phase difference of 90°; a first circulator configured to receive a first output of the hybrid coupler through a first terminal thereof and output the received first output through a second terminal thereof; a second circulator configured to receive a second output of the hybrid coupler through a first terminal thereof and output the received second output through a second terminal thereof; and an output unit's hybrid coupler configured to receive transmission signals from the second terminal of the first circulator and the second terminal of the second circulator, and combine and output the received signals.

Abstract: An electronic system includes a shared antenna, a diplexer and a processing circuit. The shared antenna corresponds to a first frequency band and a second frequency band, wherein the first frequency band meets a wireless radio frequency identification (RFID) standard, and the second frequency band meets a near field communication (NFC) standard. The diplexer receives a wireless signal from the shared antenna, and divides the signal into a WIRELESS RFID signal component corresponding to the first band and an NFC signal component corresponding to the second band. The processing circuit is coupled to the diplexer, and arranged to process the WIRELESS RFID signal component and the NFC signal component.

Abstract: Disclosed are systems, circuits and methods related to low-loss bypass of a radio-frequency (RF) filter or diplexer. In some embodiments, a switching network circuitry can include a first switch that has an input pole configured to receive a radio-frequency (RF) signal, a pass-through throw configured to be connectable to the input pole to allow routing of the RF signal to an RF component, and at least one dedicated bypass throw configured to be connectable to the input pole and at least one bypass conduction path. The switching network circuitry can further include a second switch that has a pole and a throw, and is connectable between an output of the RF component and the bypass conduction path. Use of the dedicated bypass throw(s) in the first switch allows implementation of low-loss bypass of the filter or diplexer.

Abstract: Systems, methods, and other embodiments associated with wireless coexistence through antenna switching are described. According to one embodiment, a method includes selecting one or both of a first transceiver and a second transceiver for connection to an antenna, based, at least in part, on the operating mode of the first transceiver and the second transceiver. The method includes connecting the selected transceiver(s) to the antenna, such that the selected transceiver(s) is enabled to communicate on the antenna and any transceiver(s) not selected is not able to communicate on the antenna.

Abstract: A transceiver includes: a power amplifying circuit arranged to generate differential output signals during a transmitting mode of the transceiver; a balance-unbalance circuit arranged to convert the differential output signals into a single-ended output signal; a switchable matching circuit arranged to receive the single-ended output signal on a signal port of the transceiver during the transmitting mode, and to convert a single-ended receiving signal on the signal port into a single-ended input signal during a receiving mode of the transceiver; and a low-noise amplifying circuit arranged to convert the single-ended input signal into a low-noise input signal during the receiving mode. The power amplifying circuit, the Balun, the switchable matching circuit, and the low-noise amplifying circuit are configured as a single chip.

Abstract: Embodiments of the present invention provide a filter, a receiver, a transmitter, and a transceiver. The filter includes a resonant cavity component, a microstrip filtering component, and two connecting pieces, where the resonant cavity component includes at least two resonant cavities connected in parallel, each resonant cavity is provided with a resonator and a tuning screw, the microstrip filtering component includes a dielectric substrate and a microstrip positioned on the dielectric substrate, one of the connecting pieces matches and connects one end of the microstrip to the resonator on one resonant cavity, the other connecting piece matches and connects the other end of the microstrip to the resonator on another resonant cavity, and impedance of the resonant cavity component is less than impedance of the microstrip filtering component.

Abstract: An entire radio transceiver can be easily integrated into one IC chip. In order to integrate the IF filters on the chip, a heterodyne architecture with a low IF is used. A single, directly modulated VCO is used for both up-conversion during transmission, and down-conversion during reception. Bond-wires are used as resonators in the oscillator tank for the VCO. A TDD scheme is used in the air interface to eliminate cross-talk or leakage. A Gaussian-shaped binary FSK modulation scheme is used to provide a number of other implementation advantages.

Abstract: An integrated circuit chip including a chip pin configured to direct radio frequency signals on and off chip; a signal path from the chip pin which divides into a first signal path coupled to an input unit and a second signal path coupled to an output unit; a first filter between the chip pin and the input unit on the first signal path; a second filter between the chip pin and the output unit on the second signal path; a first switch coupling the first signal path to ground; and a second switch coupling the second signal path to ground; wherein the first and second switches are controllable to isolate the input unit from the output unit when the integrated circuit chip is transmitting a radio frequency signal, and to isolate the output unit from the input unit when the integrated circuit chip is receiving a radio frequency signal.

Abstract: A method for selecting the state of a reconfigurable antenna installed at either the receiver or transmitter of a communication system is provided. The proposed method uses online learning algorithm based on the theory of multi-armed bandit to perform antenna state selection. The selection technique utilizes the Post-Processing Signal-to-Noise Ratio (PPSNR) as a reward metric and maximizes the long-term average reward over time. The performance of the learning based selection technique is empirically evaluated using wireless channel data. The data is collected in an indoor environment using a 2×2 MIMO OFDM system employing highly directional metamaterial Reconfigurable Leaky Wave Antennas. The learning based selection technique shows performance improvements in terms of average PPSNR and regret over conventional heuristic policies.

Abstract: Disclosed herein is a circuit for controlling a switching time of a transmitting and receiving signal in a wireless communication system including: a high speed switch circuit unit receiving a signal transceived through an antenna to perform a high speed switching operation; a low speed switch circuit unit the signal transceived through the antenna to perform a low speed switching operation; and a controlling unit applying a control signal for controlling a switching time to the high speed switch circuit unit or the low speed switch circuit unit.

Abstract: A microwave radio frequency (RF) front end module (FEM) having a low noise amplifier (LNA) with a bypass mode uses a single-pole-triple-throw RF switch that reduces insertion loss to about 1 dB and thereby improves RF receiver sensitivity over existing technology two series connected single-pole-double throw RF switches. The single-pole-triple-throw RF switch may be three metal oxide semiconductor field effect transistor (MOSFET) RF switches that may be arranged with a common source input and isolated independent drain outputs. The RF switches may be single, double or triple gate MOSFET RF switches. The MOSFET RF switches may also be configured as complementary metal oxide semiconductor (CMOS) field effect transistor (FET) RF switches.