Abstract: A GPS/Beidou onboard antenna with a dual output port low noise amplifier includes an antenna, an amplifier chip, a power divider, a first radio frequency switch, a second radio frequency switch, a first direct-current bias, a second direct-current bias, a first port, a second port, and a voltage selection circuit. The antenna transmits a received radio frequency signal amplified by the amplified chip to the power divider connected to the amplified chip; the radio frequency signal is divided by the power divider, in one of which the radio frequency signal goes through the first radio frequency switch, the first direct-current bias and the first port so as to be output to a receiver connected, and in the other of which the radio frequency signal goes through the second radio frequency switch, the second direct-current bias and the second port so as to be output to another receiver connected.

Abstract: A high power semiconductor switch including a plurality of transistor switch circuits connected in series between first and second ports. A first set of transistor switch circuits is located immediately adjacent to the first port, a second set of transistor switch circuits is located immediately adjacent to the second port, and a third set of transistor switch structures are located between the first and second sets. Each transistor switch circuit of the first and second set includes a switching transistor and a dynamic impedance circuit, wherein the dynamic impedance circuit reduces the effective impedance of the corresponding switching transistor when an RF signal is being transmitted. The dynamic impedance circuits are designed to reduce and equalize the voltage drops across the switching transistors of the first and second sets.

Abstract: Antenna switch modules and methods of making the same are provided. In one implementation, an antenna switch module includes a first transmit and first receive port that are respectively connected to at least one antenna series switches. The first receive and transmit port receive and transmit signals on a first frequency. In one implementation, a second transmit and second receive port are connected to the at least one antenna and transmit and receive signals on a second frequency. In this implementation, the second receive port is connected to the at least one antenna via a series switch but the second transmit port is connected to the at least one antenna via a inductive resonance circuit that provides impedance to isolate the second transmit port when the first transmit port or receive port is transmitting or receiving via the at least one antenna.

Abstract: An apparatus and method for a frequency based integrated circuit that selectively filters out unwanted bands or regions of interfering frequencies utilizing one or more tunable notch or bandpass filters or tunable low or high pass filters capable of operating across multiple frequencies and multiple bands in noisy RF environments. The tunable filters are fabricated within the same integrated circuit package as the associated frequency based circuitry, thus minimizing R, L, and C parasitic values, and also allowing residual and other parasitic impedance in the associated circuitry and IC package to be absorbed and compensated.

Abstract: A communication unit includes a first input terminal to which a first transmission signal based on a first communication standard is input, a second input terminal to which a second transmission signal based on a second communication standard is input, a first transmission signal amplifier circuit outputting a first amplified transmission signal, or outputting a second amplified transmission signal, a first input-output terminal outputting the first amplified transmission signal or the second amplified transmission signal, and at least one of a first reception signal and a second reception signal inputted to the first input-output terminal, a first reception signal amplifier circuit performing at least one of operation of outputting a first amplified reception signal and operation of outputting a second amplified reception signal, a first output terminal outputting the first amplified reception signal, and a second output terminal outputting the second amplified reception signal.

Abstract: An antenna device includes a plurality of antenna element groups including a plurality of antenna elements arranged in a horizontal direction. The plurality of antenna element groups are arranged in multiple stages in a vertical direction. The stage antenna element group includes a first antenna element group in which the antenna element in an even number sequence from the antenna element configuring the antenna element group is arranged at a shifted position to an upper side or a lower side in the vertical direction from the antenna element in an odd number sequence, and a second antenna element group in which the antenna element in the even number sequence from the antenna element configuring the antenna element group is arranged at a shifted position to the other side of the lower side or the upper side in the vertical direction from the antenna element in the odd number sequence.

Abstract: A communication circuit according to one embodiment includes a single element antenna, a plurality of signal-limiting circuits, a high-frequency transceiver circuit, and a low-frequency transceiver circuit. The high-frequency transceiver circuit is adapted to be selectively coupled to the single element antenna via the plurality of signal-limiting circuits and tuned to operate at a high frequency carrier frequency, and the low-frequency transceiver circuit is adapted to be selectively coupled to the single element antenna via the plurality of signal-limiting circuits and tuned to operate at a low frequency carrier frequency.

Abstract: Described is a differential data bus system which maintains error free communication despite faults in one of the data bus lines.

Abstract: An impedance matching network between a transmitter and an antenna. The impedance matching network comprises of a watt meter coupled to the transmitter for measuring a standing wave ratio (“SWR”). A first unbalanced to unbalanced transformer (“first unun”) with an impedance ratio of N:1 is selectively coupled in series with the watt meter. A microprocessor is coupled to the watt meter for determining iteratively whether the first unun lowers the standing wave ratio (“SWR”) in response to switching the first unun in and out of a series connection with the antenna.

Abstract: Apparatus and methods for front-end systems with multiple loopbacks and a shared back switch are provided. In certain configurations, a front-end system includes a first transmit path between a first transmit port and an antenna port, a second transmit path between a second transmit port and the antenna port, a first loopback path from the first transmit path to a receive port, and a second loopback path from the second transmit path to the receive port. The first and second loopback paths operate with a shared back switch to reduce area and/or complexity of the front-end system. Additionally, each loopback path includes a loopback selection switch that operates in combination with the back switch to select that particular loopback path.

Abstract: An example redundancy architecture is described that includes a plurality of nominal RF paths, a plurality of spare input RF paths, a controllable input switching system, a plurality of spare output RF paths, and a controllable output switching system. The controllable input switching system is configured to selectively link any one of the plurality of spare input RF paths to any one of the plurality of nominal RF paths while avoiding disruption of service on the other nominal RF paths. In addition, the controllable output switching system is configured to selectively link any one of the plurality of nominal RF paths to any one of the plurality of spare output RF paths while avoiding disruption of service on the other nominal RF paths.

Abstract: A communication circuit according to one embodiment includes a single element antenna, a plurality of signal-limiting circuits, a high-frequency transceiver circuit, and a low-frequency transceiver circuit. The high-frequency transceiver circuit is adapted to be selectively coupled to the single element antenna via the plurality of signal-limiting circuits and tuned to operate at a high frequency carrier frequency, and the low-frequency transceiver circuit is adapted to be selectively coupled to the single element antenna via the plurality of signal-limiting circuits and tuned to operate at a low frequency carrier frequency.

Abstract: An apparatus is provided that includes a power transmitter, data receiver, and an antenna operatively coupled to the power transmitter and data receiver. The antenna being configured to switchably transmit energy from the power transmitter to power a sensor, and receive data to the data receiver from the sensor in which a frequency being used by the antenna is the same for both transmission of the energy and reception of the data.

Abstract: An antenna system includes an antenna array, a wireless transceiver module and a control module. The antenna array includes a first antenna and a second antenna coupled respectively to the wireless transceiver module. The wireless transceiver module sends and receives signals via the first antenna based on a first phase and sends and receives signals via the second antenna based on a second phase. The control module coupled to the wireless transceiver module, and controls the phase difference between the first phase and the second phase. The radiation pattern of the antenna array is modulated towards one pointing direction based on the phase difference.

Abstract: A switch includes an input terminal and an output terminal. The switch also includes a first stack having transistors coupled in series, and a second stack having transistors coupled in series. The first stack and the second stack are connected in parallel with one another.

Abstract: The invention relates to a directional coupling communication apparatus where the coupling impedance can be easily matched to reduce reflections, and thus, the speed of communication channels is increased as compared to that with inductive coupling, and at the same time, the reliability of communication is improved by increasing the signal intensity. Modules having a coupler where an input/output connection line is connected to a first end, and either a ground line or an input/output connection line to which an inverse signal of a signal to be inputted into the input/output connection line connected to the above-described first end is inputted is connected are layered on top of each other so that the couplers are couplers to each other using capacitive coupling and inductive coupling.

Abstract: A entry adapter configured to allow external signals to be received by the entry adapter and including a first splitter electrically connected to a first port and a second port. The entry adapter includes a frequency band rejection device electrically connected to the first splitter, and configured to allow the external signals to proceed therethrough to a plurality of third ports, and to block the client signals from proceeding therethrough to the first port. The entry adapter also includes a second splitter electrically connected to the frequency band rejection device and the plurality of third ports, and configured to distribute the external signals received from the frequency band rejection device to the plurality of third ports. The external signals do not proceed through the second splitter.

Abstract: An antenna structure of multi-band frequency and simple structure includes a base plate, a supporting portion and an antenna mounted on the supporting portion. The base plate has a signal source thereon. The antenna has an input end. The antenna includes a first antenna, a second antenna and a connecting portion coupled with the first antenna and the second antenna, the antenna also has a first switch portion, a second switch portion and a third switch portion, the base plate has a first circuit and a second circuit. The input end is mounted on the connecting portion, the first switch portion is mounted between the signal source and the input end, the second switch portion is mounted on the first antenna, and the third switch portion is mounted on the second antenna.

Abstract: Provided are a communications state determination device, etc., capable of improving the accuracy of network state specification. This communications state estimation device comprises: a setting means that, in accordance with given communications parameters, applies the communications parameters to a communications device that determines the occurrence of communications errors in communications with a communications destination device; a detection means that sends communications instructions to the communications device that performs communications, in accordance with received communications instructions, and detects the occurrence of communications errors that have been determined in the communications that are in accordance with the instructions; and an estimation means that estimates whether or not the communications device can perform the communications, on the basis of the communications parameters and the existence or otherwise of communications errors.

Abstract: Downlink signals output from a transmission and reception unit are combined with an interference signal of a CW, a resultant signal is applied to a mobile terminal, throughputs for respective interference signal frequencies for the downlink signals are collectively measured, a signal suppression band of the filter is fitted to a frequency band of the downlink signal determined not to reach a defined value, and re-measurement and re-determination of the throughput for the downlink signal among the collectively measured throughputs are performed. In a case where throughputs collectively measured at a certain interference signal frequency are equal to or greater than the defined value and a case where re-measured throughputs of all the downlink signals are equal to or greater than the defined value, the interference signal frequency is switched to the next interference signal frequency, and collective throughput measurement is performed.

Abstract: A filter module includes filters. Each of the filters is configured to control communications bands having overlapping bandwidths each with the other. Each of the communications bands, allocated to any one of the filters, has a different limit frequency from the other.

Abstract: An inspection apparatus of an embodiment includes a transmitting antenna device connected to a transmitting unit including a transmitting device configured to transmit a microwave, and a receiving antenna device connected to a receiving unit including a receiving device. Each of the transmitting antenna device and the receiving antenna device faces a subject to be inspected. The receiving antenna device receives at least one of a microwave transmitted from the transmitting antenna device and penetrating the subject to be inspected, a microwave of which phase has been delayed, and a microwave diffracted in the subject to be inspected. The receiving unit is a directional antenna.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for a radio receiver with a hybrid channelizer architecture. In some implementations, a receiver includes an input to receive a first signal encoding digital samples of a radiofrequency signal. The receiver includes a frequency shifter configured to generate a second signal that is frequency shifted relative to the first signal. The receiver includes a first polyphase filter bank configured to receive the first signal and provide filter bank outputs for first sub-bands. The receiver includes a second polyphase filter bank configured to receive the second signal and provide filter bank outputs for second sub-bands. The receiver includes a switch network configured to select among the filter bank outputs and provide the filter bank outputs to respective digital channelizer modules for multiple channels.

Abstract: Aspects of the subject disclosure may include, for example, a guided wave switch that selectively aligns an end of the first dielectric core of a first conductorless guided wave cable with an end of a selected one of a plurality of second dielectric cores of at least one second conductorless guided wave cable to facilitate coupling of the first guided waves from the first dielectric core to a selected one of the plurality of second dielectric cores. Other embodiments are disclosed.

Abstract: A multimedia communication apparatus, suitable for a first multimedia apparatus, is adapted to transmit or receive multimedia data and is electrically connectable to a standard connector. The standard connector may be non-reversibly or reversibly connected to a plug of a standard cable, and includes a plurality of the pins. The pins include multiple differential signal pins serving as multiple multimedia channels, a power pin serving as a power line, a first polarity pin, a first data pin and a ground pin. The multimedia communication apparatus includes a control logic and a multimedia signal processor. The multimedia signal processor transmits or receives multimedia data to/from a second multimedia apparatus through the multimedia channels, and further power handshakes or exchanges information with the second multimedia apparatus. The information is for controlling a multiplexer to switch the multimedia channels.

Abstract: A phased array antenna system with electrical tilt control incorporates a tilt controller (62) for splitting an input signal into three intermediate signals, two of which are delayed by variable delays T1 and T2 relative to the third. A corporate feed (64) contains splitters S3 to S10 and hybrids H1 to H6 for processing the intermediate signals to produce drive signals for elements of an antenna array (66); the drive signals are fractions and vector combinations of the intermediate signals. The tilt controller (62) and the corporate feed (64) in combination impose relative phasing on the drive signals as appropriate for phased array beam steering in response to variable delay of two intermediate signals relative to the third intermediate signal.

Abstract: A semiconductor switch includes a first switching element connected between a first terminal and a second terminal, a second switching element connected between the second terminal and a third terminal, a first resonant circuit having a zero impedance when resonating at a first frequency, a second resonant circuit having a zero impedance when resonating at N times the first frequency, wherein N is an integer greater than 1, and a transmission line having a first point connected to the second terminal, a second point connected to the first resonant circuit, and a third point connected to the second resonant circuit. A length of the transmission line between the first and second points corresponds to one-quarter of a wavelength corresponding to the first frequency, and a length of the transmission line between the first and third points corresponds to one-half of the wavelength corresponding to the first frequency divided by N.

Abstract: This application relates to methods and apparatus for transfer of data between a host device (400) and a peripheral device (300) via a USB Type-C connector (100; 304) of the host device. A data controller is described that has a path controller (309, 310; 706) for establishing signal paths between circuitry of the host device and contacts (101) of said USB Type-C connector. The path controller is operable in at least first and second modes. In the first mode the path controller establishes separate signal paths to each of at least first, second, third and fourth contacts (A6, A7, B6, B7) of the USB Type-C connector and a plurality of the established signal paths are for transfer of analog audio data. In the second mode the path controller establishes a pair of signal paths to only a subset of said first to fourth contacts to provide a differential digital data path.

Abstract: A device for generating an alternating radio-frequency electromagnetic field in a working area includes an applicator emitting the electromagnetic field, an oscillator providing an alternate voltage and electric current having a predetermined value and a predetermined frequency to the applicator, a power supply supplying a substantially DC voltage to the oscillator, and a control system controlling the electrical parameters of the AC voltage, the AC current and/or the frequency provided to the applicator by the oscillator. The control system includes an input port connected to the electric power network, a first electronic control circuit connected to the input port and substantially instantaneously varying the electrical parameters and instantaneous control of the field emission power, and a second electronic control circuit regulating the operation of the oscillator. The first electronic circuit has an output connected to the power supply. A plant includes the device and a control method for the device.

Abstract: An impedance matching network between a transmitter and an antenna. The impedance matching network comprises of a watt meter coupled to the transmitter for measuring a standing wave ratio (“SWR”). A first unbalanced to unbalanced transformer (“first unun”) with an impedance ratio of N:1 is selectively coupled in series with the watt meter. A microprocessor is coupled to the watt meter for determining iteratively whether the first unun lowers the standing wave ratio (“SWR”) in response to switching the first unun in and out of a series connection with the antenna.

Abstract: An electric power transmission device for wirelessly transmitting electric power in a highly conductive medium includes a power transmitting unit configured to wirelessly transmit electric power and a power receiving unit configured to intromit the wireless electric power transmitted from the power transmitting unit. The power transmitting unit and the power receiving unit include an electric power transmission coil and a containment member having a dielectric configured to cover the electric power transmission coil, and transmit the electric power by causing resonance at a frequency determined by impedance of the power transmitting unit, impedance of the power receiving unit, and impedance of the highly conductive medium.

Abstract: The disclosure provides a switchable filtering circuit and the related operation method, in particular related to a filtering circuit which can be used for Bluetooth system and wireless local area network system. By using a first switch, a hybrid filtering circuit and a second switch, the received mode and transmitted mode between these two systems is realized. Moreover, the frequency responses and the bandwidth adjustments can be controlled according to the plurality of switchable resistors, the plurality of switchable capacitors and the shared and switchable resistors within the hybrid filter circuit. Moreover, the effects of high operated freedom of the circuit and the circuit size reduction can be achieved.

Abstract: A radio-frequency front-end circuit includes a first filter that has a first pass band and is connected to an antenna common terminal, a second filter that has a second pass band and is connected to the antenna common terminal, a switch that includes a common terminal and selection terminals, the common terminal being connected to the first filter, and a third filter that is connected to one of the selection terminals and is disposed between the switch and an input/output terminal. A reflection coefficient of the first filter alone in the second pass band viewed from the antenna common terminal is larger than a reflection coefficient of the third filter alone in the second pass band viewed from the antenna common terminal.

Abstract: The disclosure is directed to optimized switching circuitry utilizing MEMS (Microelectromechanical Systems) circuitry in series with solid state circuitry. Specifically, the MEMS circuitry includes a first MEMS circuit in parallel with (and separate from) a second MEMS circuit. A paired signal is defined as a transmit signal and a receive signal (in a single band) that are transmitted or received on separate paths or on separate nodes. The transmit signal is associated with the first MEMS circuit, and the receive signal is associated with the second MEMS circuit. The solid state circuitry switches between the first MEMS circuit and second MEMS circuit without requiring any switching in the first or second MEMS circuits.

Abstract: A feeding circuit arrangement (18) supplies a radio frequency signal to a plurality of coil elements (14) of a magnetic resonance coil system (12). The circuit arrangement (18) includes a main line (20) for connecting a radio frequency signal source (16); a plurality of feeding lines (22), each feeding line (22) for connecting a corresponding coil element (14) of the coil system (14); a power divider (24) arranged between the main line (20) and the plurality of feeding lines (22) for distributing the signal on the main line (20) to each of the feeding lines (22). At least one of the feeding lines (22) includes a controllable switching circuit (26) with a switching element (28) for connecting/disconnecting of two resulting line sections (30, 32) of the feeding line (22), a first line section (30) on the divider side and a second line section (32) on the side connectable to the coil element (14).

Abstract: A technique relates to a lossless microwave switch discussed herein. Multiple ports are included in the lossless microwave switch. Tunable filters are included in the lossless microwave switch. Each of the ports is operatively coupled a corresponding one of the tunable filters.

Abstract: RF filtering circuitry includes a common node, a first input/output node, a second/input output node, a first filter coupled between the common node, the first input/output node, and the second input/output node, and a second filter coupled between the common node, the first input/output node, and the second input/output node. The first filter is configured to provide a first bandpass filter response between the common node and the first input/output node, where the first bandpass filter response is configured to pass RF signals within a first subset of the first frequency band while attenuating other signals. Further, the first filter is configured to provide a bandstop filter response between the common node and the second input/output node, where the bandstop filter response is configured to attenuate RF signals within the first subset of the first frequency band while passing other signals.

Abstract: The disclosure relates to transceivers incorporating a transmit-receive switching circuit, embodiments of which include a radio transceiver circuit comprising: a first amplifier for amplifying signals received from an antenna via an antenna connection; a second amplifier for amplifying signals to be transmitted by the antenna via the antenna connection; and a switching circuit connected between an input of the first amplifier and the antenna connection, the switching circuit comprising a capacitor, a switching element and an impedance matching element, wherein the switching element is configured to connect a node between the capacitor and the impedance matching element to a signal ground when the transceiver is in a transmit mode.

Abstract: The present invention relates to a 3×3 Butler matrix, comprising a first directional coupler, a second directional coupler, a third directional coupler, a first fixed phase shifter, a second fixed phase shifter and a third fixed phase shifter; and also relates to a 5×6 Butler matrix, comprising a first 3×3 Butler matrix, a second 3×3 Butler matrix, a fourth directional coupler, a fifth directional coupler, a power divider, a fourth fixed phase shifter and a fifth fixed phase shifter. The 3×3 Butler matrix and the 5×6 Butler matrix provided in the present invention have the features of small size, wide frequency band, low loss, high isolation and stable performance, fill the blank of specific technical schemes about the 3×3 Butler matrix and the 5×6 Butler matrix in the prior art, and have broad application prospects and great value.

Abstract: A reconfigurable radio frequency aperture including a substrate, a plurality of reconfigurable patches on the substrate, and a plurality of reconfigurable coupling elements on the substrate, wherein at least one reconfigurable coupling element is coupled between a reconfigurable patch and another reconfigurable patch, and wherein the reconfigurable coupling elements affect the mutual coupling between reconfigurable patches.

Abstract: A switching circuit is provided. The switching circuit includes at least one Surface Acoustic Wave (SAW) filter, a Single-Pole n Throw (SPnT) switch connected to an input port of each of the at least one SAW filter, and a Dual-Pole n Throw (DPnT) switch connected to an output port of each of the at least one SAW filter.

Abstract: A reconfigurable device for terahertz (THz) or infrared (IR) ranges that includes a base substrate, a lower array attached to the base substrate, and an upper array attached to the base substrate and at least partially suspended over the lower array. Activation of the reconfigurable device causes the upper array to mechanically flex towards the lower array so that electrical contact is made therebetween. Methods of fabricating and operating the reconfigurable device are also provided.

Abstract: An edge portion which defines a planar shape has two long end sides (108a, 108b) which extend in parallel to each other, and two short end sides (107, 109) which have parallel portions extending in parallel to each other. The two long end sides and the two short end sides are reflection terminals. The parallel portion of the first short end side (107) includes a first portion (107a) and a second portion (107b). The positions of the antinodes of a first standing wave formed by a traveling wave directed toward the first portion (107a) and a reflected wave of the traveling wave and a second standing wave formed by a traveling wave directed toward the second portion (107b) and a reflected wave of the traveling wave in a direction substantially parallel to the long end sides (108a, 108b) are deviated by ¼ of the wavelength of an electromagnetic wave propagating through an electromagnetic wave transmission sheet.

Abstract: A high performance switch module to filter a radio frequency signal and to selectively connect to an output includes a filter unit and a plurality of switches. The filter unit has a filter configured to connect to the radio frequency signal and having a plurality of parallel output ports. The plurality of switches is connected between the plurality of parallel output ports and the output, the plurality of switches configured to connect to a control input to selectively connect an output port of the plurality of parallel output ports to the output and to selectively connect a remainder of the plurality of parallel output ports to a connection providing a substantially full reflection to the remainder of the plurality of parallel output ports of the filter unit.

Abstract: An apparatus performs a method for connecting a mobile terminal to an external device. The method includes determining a connection method of the external device among a plurality of connection methods based on values of at least two ports among a plurality of ports included in a connector, and switching at least one switch included in the connection unit so as to connect to the external device according to the determined connection method of the external device.

Abstract: A radio frequency (RF) circuit is described that comprises a plurality of switching arms selectively activatable and associated with corresponding RF input ports. A switch source impedance is associated with each of the RF input ports. The switch source impedance is frequency dependent with its value matched to a characteristic impedance value within a first frequency range. The value of the switch source impedance is not matched to the characteristic impedance value within a second frequency range. When an RF signal within the first frequency range is transmitted through the RF circuit, between one of the RF input ports and an a common port, an RF distortion voltage within a distortion frequency range results at the common port; and the amplitude of a resultant RF distortion voltage is lower than an RF distortion voltage if the switched source impedance is matched to the characteristic impedance within the second frequency range.

Abstract: An acoustic wave device is provided with a low-frequency side filter having a low-frequency side passband, a high-frequency side filter having a high-frequency side passband, and first and second balanced terminals. The low-frequency side filter is connected to a first unbalanced terminal. The low-frequency side passband is a frequency band from a first minimum frequency to a first maximum frequency. The high-frequency side filter is connected to a second unbalanced terminal. The high-frequency side passband is a frequency band from a second minimum frequency to a second maximum frequency. The low-frequency side filter includes a first longitudinally-coupled acoustic wave resonator and a first one-terminal pair acoustic wave resonator connected in series to the first longitudinally-coupled acoustic wave resonator. An antiresonant frequency of the first one-terminal pair acoustic wave resonator is set to be higher than the first maximum frequency and lower than the second minimum frequency.

Abstract: Aspects of this disclosure relate tuning an impedance presented to a common port of a multi-throw switch and a tunable notch filter coupled to the common port. The impedance presented to the common port can be tuned based on an impedance associated with a throw of the multi-throw switch that is activated. According to embodiments of this disclosure, a shunt inductor in parallel with a tunable capacitance circuit can tune the impedance presented to the common port of the multi-throw switch. In certain embodiments, the tunable notch filter includes a series LC circuit in parallel with a tunable impedance circuit.

Abstract: Apparatus and methods for biasing radio frequency (RF) switches are provided herein. In certain configurations, an RF switching circuit includes a field effect transistor (FET) switch electrically connected between a first terminal and a second terminal, and an adaptive biasing circuit that generates a bias voltage used in part to bias a gate of the FET switch. The adaptive biasing circuit includes a low pass filter that generates a low pass filtered voltage based on low pass filtering a voltage of the first terminal, a buffer circuit that receives the low pass filtered voltage and generates a buffered voltage, and a voltage shifting circuit that generates the bias voltage by shifting the buffered voltage by an amount of voltage that depends on a state of a switch control signal.

Abstract: An radio frequency switch according to an example includes a first switching circuit including first switching elements connected in series between an antenna port and a transmission port and operated by a first gate signal, a second switching circuit including second switching elements connected in series between the antenna port and a reception port and operated by a second gate signal, a first shunt circuit connected between the transmission port and a ground and operated by the second gate signal, a second shunt circuit connected between the reception port and the ground and operated by the first gate signal, and a third shunt circuit connected between the reception port and the other end of an inductor grounded at one end and operated by the second gate signal.