Abstract: There has been a problem that the distortion characteristic of a switch circuit for a high frequency is deteriorated. A switch circuit in accordance with one aspect of the present invention includes a transistor connected in series between input and output terminals, a control terminal that receives a signal to control the conductive state of the transistor, a first resistor connected between the control electrode of the transistor and the control terminal, and a series circuit of a diode and a second resistor, the series circuit being connected in parallel with the first resistor between the control terminal and the control electrode of the transistor.

Abstract: An electronic device includes a first and a second micro-electromechanical switch assembly on a substrate, between which first and second switch assembly a first line having a first impedance and a second line having a second impedance are present. The first switch assembly includes an input terminal and a first and a second output terminal connected to the first and the second line, respectively. The second switch assembly includes an output terminal and a first and second input terminal connected to the first and second line, respectively.

Abstract: Provided is a switching circuit for a millimeter waveband control circuit. The switching circuit for a millimeter waveband control circuit includes a switching cell disposed on a signal port path to match an interested frequency and including at least one transistor coupled vertically to an input/output transmission line and a plurality of ground via holes disposed symmetrically in an upper portion and a lower portion of the input/output transmission line; capacitors for stabilizing a bias of the switching cell; and bias pads coupled in parallel to the capacitor to control the switching cell.

Abstract: An antenna switch (31) that is arranged to alternately operate in a receive mode and a transmit mode, comprises adaptive filter (30). Herewith, signal processing means (Rx1, Rx2 and Rx3) can be coupled to an antenna (1) during the receive mode and be insulated from the antenna during the transmit mode.

Abstract: The present invention relates to a programmable microwave circuit (1) four ports (3), and combinations of such circuits. Between each pair of ports there is at least one connection without amplification, at least one connection having amplification from a first port of the pair of ports to a second port of the pair of ports, and at least one connection having amplification from the second port to the first port. Further, there is control electronics (2) with the ability to open and close the respective connection and respective port, by which the microwave circuit could be configured for different purposes, such as amplifier, power splitter/power combiner and router.

Abstract: A wireless communication device includes an antenna module, a transceiving module, and a switch module. The antenna module includes a first antenna and a second antenna. The transceiving module includes a first transceiver and a second transceiver. The switch module switches different connections between the antenna module and the transceiving module, and includes a first single-pole-double-throw (SPDT) switch, a second SPDT switch, a third SPDT switch, a first duplexer, a second duplexer, and a double-pole-double-throw (DPDT) switch.

Abstract: A single-die multi-band switch includes a plurality of transmitter ports and a plurality of receiver ports, any one of which is selected to be connected to an antenna port. At least some of these switching topologies use a branched or cascaded switching system in order to reduce signal insertion loss. It is preferred that the individual switching elements be field effect transistors. The switching topologies employed include series-connected groups of transistors and interdigitated FETs.

Abstract: A front end circuit for selectively coupling a first antenna and a second antenna to a transmit chain and a receive chain of a radio frequency (RF) transceiver is disclosed. There is a first power amplifier having an input connectible to the transmit chain of the RF transceiver, a first low noise amplifier having an output connectible to the receive chain of the RF transceiver, and a second low noise amplifier with an input connectible to the second antenna, as well as an output connectible to the receive chain of the RF transceiver. A first matching and switch network is connected to the first antenna, the output of the first power amplifier, and the input of the first low noise amplifier. Transmit signals from the first power amplifier and receive signals from the first antenna are selectively passed to the first antenna and the first low noise amplifier.

Abstract: Methods and systems for processing signals via directional couplers embedded in an integrated circuit package are disclosed and may include generating via a directional coupler, one or more output RF signals that may be proportional to a received RF signal. The directional coupler may be integrated in a multi-layer package. The generated RF signal may be processed by an integrated circuit electrically coupled to the multi-layer package. The directional coupler may include quarter wavelength transmission lines, which may include microstrip or coplanar structures. The directional coupler may be electrically coupled to one or more variable capacitances in the integrated circuit. The variable capacitance may include CMOS devices in the integrated circuit. The directional coupler may include discrete devices, which may be surface mount devices coupled to the multi-layer package or may be devices integrated in the integrated circuit. The integrated circuit may be flip-chip bonded to the multi-layer package.

Abstract: Methods and systems for a balun embedded in an integrated circuit package are disclosed and may include a multi-layer package bonded to an integrated circuit. The multi-layer package may include an integrated balun which may be enabled to process RF signals received from and/or communicated to an antenna. The integrated circuit may be flip-chip bonded to the multi-layer package. The balun may include ferromagnetic layers integrated in the multi-layer package, and may be bypassed via bypass switches integrated in the multi-layer package. The switches integrated in the multi-layer package may include MEMS switches. The balun may be bypassed via bypass switches in the integrated circuit. The switches in the integrated circuit may include CMOS switches. The balun may be impedance matched to the integrated circuit via surface mount devices, which may be coupled to the multi-layer package.

Abstract: Disclosed are a radio frequency (RF) front end module and a multi-band communication module using the RF front end module. The RF front end module may use a plurality of bandpass filters and at least one diplexer being connected to at least one of front ends or rear ends of two bandpass filters of the plurality of bandpass filters.

Abstract: A low-loss Radio Frequency (RF) switch for high-power RF signals. The RF switch includes a first-biasing circuit connected to a first transistor and a second-biasing circuit connected to a second transistor. The RF switch switches its output signal between a first input signal and a second input signal. The first transistor is in a conduction state and the second transistor is in a non-conduction state when the first input signal is to be conducted to the output signal. The first-biasing circuit biases the first transistor at a first voltage for increasing conduction of the first input signal and the second-biasing circuit biases the second transistor at a second voltage for decreasing conduction of the first input signal. Moreover, the second transistor is in a conduction state and the first transistor is in a non-conduction state when the second input signal is to be conducted to the output signal.

Abstract: Disclosed is a switch circuit capable of reducing distortion caused by harmonics and preventing an increase in insertion loss even if the number of ports increases. The switching circuit includes one common output port, M first switches having one set of ends connected in common to a first node (M?2 where M is a constant), N second switches having one set of ends connected in common to the common output port (N?1 where N is a constant), a third switch having one end connected to the common output port and the other end connected to the first node, M first input ports respectively connected to the other set of ends of the first switches, and N second input ports respectively connected to the other set of ends of the second switches. One selected among the first input ports and the second input ports is connected to the common output port, and if one of the first input ports is selected, the third switch is closed.

Abstract: A wireless device includes high-performance CMOS RF switches that include serially connected transistors coupled between an input terminal and an output terminal, with an inductor coupled from the input to the output that resonates out the capacitance of the transistors to improve isolation. The transistors have a floating/bootstrapped body with remote body contacts.

Abstract: A high-frequency module includes at least first and second signal circuits that are each connected between a common antenna port and at least first and second signal ports. The first signal circuit includes a first inductor connected in series between the antenna port and the first signal port, a first capacitor connected in series between the first inductor and the first signal port, and a second inductor connected in shunt between the first capacitor and the first signal port. Series resonance is produced between the first inductor, the first capacitor, and the second inductor at a frequency within the frequency band of a target signal of the second signal circuit.

Abstract: Embodiments of the invention may provide for a CMOS antenna switch, which may be referred to as a CMOS SPDT switch. The CMOS antenna switch may operate at a plurality of frequencies, perhaps around 900 MHz 1.9 GHz and 2.1 GHz according to an embodiment of the invention. The CMOS antenna switch may include both a receiver switch and a transmit switch. The receiver switch may utilize a multi-stack transistor with body substrate switching and source and body connection along with body floating technique to block high power signals from the transmit path by preventing channel formation of the device in OFF state as well as to maintain low insertion loss at the receiver path. Example embodiments of the CMOS antenna switch may provide for 35 dBm P 1 dB at both bands (e.g., 900 MHz and 1.9 GHz and 2.1 GHz). In addition, a ?60 dBc second and third harmonic up to 28 dBm input power to the switch, may be obtained according to example embodiments of the invention.

Abstract: A method for fabricating integrated MEMS switches and filters includes forming cavities in a silicon substrate, metalizing a first pattern on a quartz substrate to form first switch and filter elements, bonding the quartz substrate to the silicon substrate so that the first switch and filter elements are located within one of the cavities, thinning the quartz substrate, forming conductive vias in the quartz substrate, metalizing a second pattern on a second surface of the quartz substrate to form second switch and filter elements, etching the quartz substrate to separate MEMS switches from filters, forming protrusions on a host substrate, metalizing a third metal pattern on the host substrate to form metal anchors and third switch elements, compression bonding the metal anchors on the host substrate to second switch and filter elements, forming signal lines to integrate the MEMS switches and filters and removing the silicon substrate.

Abstract: Controlling a tower-top low noise amplifier (TTLNA) without transmit mode or receive mode timing control signals from a base station. The TTLNA system and associated components autonomously determine the proper mode of operation (transmit/receive), and automatically control the operation of a low noise amplifier (LNA) to prevent signal distortion and/or damage to the wireless system hardware. A preferred method comprises: at a TTLNA, measuring a transmit time period based on detecting radio frequency (RF) transmit signal energy; determining a receive time duration based on the measured time period and a predetermined frame time; and, configuring the TTLNA to a receive mode by placing a low noise amplifier into a receive signal path during the determined receive time duration.

Abstract: In a dual band capable voltage controlled oscillator VCO circuit comprising two voltage controlled oscillator units VCO1, VCO2, the voltage controlled oscillator units VCO1, VCO2 are synchronized and connected via at least two coupled transmission lines TL1, TL2, the transmission lines [TL1, TL2) are arranged to operate according to one of two modes to enable varying a combined inductance of the synchronized oscillator units VCO1, VCO2 and the oscillation frequency for the voltage controlled oscillator circuit VCO.

Abstract: A non-reflective ring topology MPNT switching device comprises at least two poles, at least four throws, plural main switches, and plural bridge switches. The bridge switches enable all throws to be non-reflective throughout a wide frequency range. Each main switch is connected between one of the poles and one of the throws. Each bridge switch is connected between two of the throws, and each throw is connected to at least M+1 of the bridge switches, M being the pole count. In operation, each of M of the main switches has a first (ON) state and is connected to one of M active throws. For each active throw, each bridge switch connected to the active throw has a second (OFF) state. For each non-active throw, one bridge switch connected to the non-active throw has the first (ON) state and each other connected bridge switch has the second (OFF) state.

Abstract: An impedance matched lane reversal switching system including first and second transceiver pairs, each of the pairs including a transmitter connected to a receiver, the output of the transmitter connected to the input of the receiver and to a node, the node of each pair interconnected with a transmission line and a switching circuit for selectively enabling one of the transmitters of one of the transceiver pairs and disabling the other and selectively utilizing one of the receivers of the other of the transceiver pairs and not the other to selectively reverse an egress side and an ingress side of the lane.

Abstract: Disclosed is a high frequency switch wherein a first switch circuit is connected in series to a first ?/4 signal transmission path connected between an antenna connecting terminal and a transmission terminal. In the first switch circuit, a first ?/4 transmission path and a first parallel resonant circuit, which includes one first PIN diode, are connected in series. In a first inductor of the first parallel resonant circuit, a constant is set so that a resonance frequency of the first parallel resonant circuit and the center frequency of a first antenna switch are the same when the first PIN diode is turned off.

Abstract: Presented are method and apparatus embodiments to terminate an interruptible signal path when the interruptible signal path is unterminated. The apparatus can comprise a signal path from a supplier-side port thru a user-side port, a signal source arranged to provide a signal to the conductor; and a signal circuit arranged in the interruptible signal path. The apparatus can determine when the signal path is unterminated and, in that case, interrupt and terminate the signal path by putting a signal switching device in the appropriate state and/or sending signals from the signal path to a prescribed signal level connection point. When a user device is not connected or connected improperly, or the signals through the signal path are otherwise unterminated, the interruptible signal path can be interrupted and terminated. The method and apparatus embodiments can be used in various combinations with multiple signal paths having multiple signal branches.

Abstract: A switchable 0°/180° phase shifter on a balanced transmission line is provided. In one embodiment, the invention relates to an apparatus for providing 0°/180° phase shifting for a transmit/receive antenna pair including a transmit element and a receive element coupled by a balanced transmission line having two sections, the apparatus including a first section of the balanced transmission line, the first section including a first conductor and a second conductor, a second section of the balanced transmission line, the second section including a third conductor and a fourth conductor, and a switch disposed between the first section and the second section, wherein in a first configuration, the switch couples the first conductor to the third conductor and the second conductor to the fourth conductor, and in a second configuration, the switch couples the first conductor to the fourth conductor and the second conductor to the third conductor.

Abstract: Methods and systems for receiving signals via a multi-port distributed antenna are disclosed and may include selectively enabling one or more low noise amplifiers (LNAs) coupled to the antenna. The selective enabling may be based on a desired gain level applied to a signal received from the antenna. The LNAs may be coupled to ports on the antenna based on an input impedance of the LNAs and an impedance of the ports. Each of the LNAs may be configured for optimum linearity in different gain ranges, which may be proportional to the input impedance of the LNAs. The antenna may be integrated on a chip with the LNAs, or may be located external to the chip. The antenna may include a microstrip antenna. The LNAs may include variable gain and may be enabled utilizing a processor. Linearity on demand may be enabled via the selective enabling of the LNAs.

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 connectable 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 connectable 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: A multi-port RF MEMS switch, a switch matrix having several multi-port RF MEMS switches and an interconnect network have a monolithic structure with clamped-clamped beams, cantilever beams or thermally operated actuators. A method of fabricating a monolithic switch has clamped-clamped beams or cantilever beams.

Abstract: Techniques, apparatus and systems for a multiple pole multiple throw (MPMT) RF switch device based on composite left and right handed (CRLH) metamaterial structures.

Abstract: A radio-frequency signal receiver capable of enhancing reception performance includes an antenna for receiving radio-frequency signals, a first switch having an end coupled to the antenna, a filter coupled to the first switch, a second switch having an end coupled to the first switch and an end coupled to the filter, a low noise amplifier coupled to the second switch for amplifying signals received from the second switch, a frequency down converter coupled to the low noise amplifier for down-converting a frequency of signals outputted from the low noise amplifier, a signal processing circuit coupled to the frequency down converter for performing signal processing, and a control circuit for controlling the first and the second switches.

Abstract: Provided is an apparatus for protecting a receiver circuit in a Time Division Duplexing (TDD) wireless communication system. In the protecting apparatus, an antenna switch transmits an output signal of a power amplifier to an antenna feed line and transmits an output signal of the antenna feed line to a low noise amplifier. A status monitor monitors a status of the antenna switch. A mode determiner disables an amplification operation of the power amplifier when a status monitoring signal output from the status monitor indicates an RX mode.

Abstract: A high isolation electronic multiple pole multiple throw (MPNT) switching device is formed as a ring circuit that includes plural poles, plural throws, plural series switches and plural means for shunting. Each series switch receives a control signal, and each means for shunting receives shunt control signals. In one aspect, the shunt control signals include control signals received by distant series switches. In another aspect, the shunt control signals include control signals received by adjacent series switches. In another aspect, the shunt control signals include signals complementary to signals received by adjacent series switches. In another aspect, the shunt control signals include pole DC potentials or throw DC potentials. In another aspect, a switching device may operate in multiple transmission mode or multiple input multiple output (MIMO) mode. The MPNT switching device provides low insertion loss and high isolation at a wide range of frequencies.

Abstract: RF signal amplifiers are provided that include an RF input port, a first RF output port, a second RF output port and a power input for receiving electrical power. These amplifiers further include a directional coupler having an input that is coupled to the RF input port, a first output and a second output. The second output of the directional coupler is connected to the second RF output port via a non-interruptible communication path. A first switching device having an input, a first output and a second output is also provided. The second output of the first switching device is coupled to a first matched termination. A first diplexer is provided that is coupled between the first output of the directional coupler and the input of the first switching device. A first power amplifier is coupled to the first output of the first switching device, and a second diplexer is coupled between an output of the first power amplifier and the first RF output port.

Abstract: Transmission of alternative content over standard device connectors. An embodiment of a method includes connecting a first device to a second device utilizing a standard connector, the connector including multiple pins, and detecting whether the second device is operating in a standard mode or an alternative mode. If the second device is operating in the alternative mode, then switching one or more pins of the standard connector for the alternative mode and transmitting or receiving signals for the alternative mode via the plurality of pins of the standard connector.

Abstract: A radio frequency (RF) transmit/receive switch. The transmit/receive switch comprises an impedance matching circuit and a voltage scaling circuit. The impedance matching circuit matches an incoming RF signal to a low noise amplifier and an outgoing RF signal from a power amplifier. The voltage scaling circuit, coupled to the impedance matching circuit, the power amplifier, and the low noise amplifier, attenuates the outgoing RF signal to a scaled signal within a breakdown voltage of a transistor device in the low noise amplifier during transmission of the outgoing RF signal.

Abstract: A wireless communication device includes an antenna module, a transceiving module, and a switch module. The antenna module includes a first antenna and a second antenna. The transceiving module includes a first transceiver and a second transceiver. The switch module switches different connections between the antenna module and the transceiving module, and includes a first single-pole-double-throw (SPDT) switch, a second SPDT switch, a third SPDT switch, a first duplexer, a second duplexer, and a double-pole-double-throw (DPDT) switch.

Abstract: A composite high-frequency component includes a diplexer arranged to separate/combine transmission/reception signals in frequency bands of a plurality of communication systems, transmit/receive switches, filters, and a balanced-unbalanced reception signal switch, and a matching circuit. The balanced-unbalanced reception signal switch includes a reception signal switch and balanced-unbalanced filters. A stripline in the transmit/receive switch and a stripline in the reception signal switch are provided on the same layers, and the matching circuit including capacitors is arranged between the transmit/receive switch and the reception signal switch.

Abstract: A linear antenna switch arm comprising a plurality of field effect transistors connected in series, the drain of each transistor being connected to the source of the next transistor at a join, the end source comprising one of a signal input or output port and the end drain comprising the complementary signal output port or input port; a signal line extending between the input and output ports; at least one of the joins being connected to the signal line at a node by a connection line; the signal line comprising at least one resistor between signal input and output ports; and the connection line comprising at least one resistor.

Abstract: A high frequency electrical signal control device comprises a transmitter for generating a high frequency electrical signal, a receiver, a transmission line for propagating the electrical signal, and a structure for radiating the electrical signal propagated through the transmission line to the space or receiving a signal from the space. The degree of coupling of the electrical signal between the space and the transmission line provided by the structure can be variably controlled.

Abstract: An integrated balun includes a low pass filter and a high pass filter that are formed on a semiconductor chip using tunable reactive elements. The outputs of the low pass filter and the high pass filter are tied together to form the single ended output of the balun. The inputs of the low pass filter and the high pass filter form the differential inputs of the balun. The low pass filter and the high pass filter each include a number of tunable networks for achieving the tunable reactive elements. Each tunable network includes at least one switching transistor and at least one fixed value reactive elements. In at least one embodiment, dynamic biasing circuitry may be provided to improve the linearity and reduce the insertion loss of the balun.

Abstract: The present disclosure is directed to a method, apparatus, and system for dividing power. An N-way power divider comprises a power input, a switched transformer, a switched power divider, and plurality of power outputs. The switched power divider is configurable to take input power and provide the power to any of the power outputs (matching the impedance utilizing the switched transformer). An antenna system comprises an input, a reconfigurable switched network operably coupled to the input, and a plurality of antenna elements. The reconfigurable switched network is configurable to provide power from input to any of the plurality of antenna elements. Each element can be provided power, or not provided power with the reconfigurable switch. The reconfigurable switched network is configurable to take in power and transform the impedance of the power to match the impedance of the active antenna elements.

Abstract: A switch circuit includes: a first input and output terminal; a first inductor connected with the first input and output terminal; a capacitor connected with the first inductor; a second input and output terminal connected with the capacitor; a first MEMS switch connected with one end of the capacitor; a second MEMS switch connected with the other end of the capacitor; and a second inductor connected between the first MEMS switch and the second MEMS switch, and satisfies a relationship of f=1/(2??CL1)=1/(2??CL2), where L1 is an inductance of the first inductor, L2 is an inductance of the second inductor, C is a capacitance of the capacitor, and f is a use frequency.

Abstract: A wave filter is installed in a multimedia wideband router, and includes a circuit board having a first low-pass wave-filtering circuit, and a band-pass wave-filtering circuit; the band-pass wave-filtering circuit consists of a high-pass wave-filtering circuit and a second low-pass wave-filtering circuit; the first low-pass wave-filtering circuit is connected to the high-pass wave-filtering circuit; the circuit board further includes an input terminal, and a first switching component, which is movable to such a position as to electrically connect the input terminal and a joint between the first low-pass wave-filtering circuit and the high-pass wave-filtering circuit; the circuit board further includes two output terminals, which are connected to the first and the second low-pass wave-filtering circuits respectively; a second switching component is provided on the circuit board, which is movable to such a position as to electrically connect the high-pass wave-filtering circuit and the second low-pass wave-filt

Abstract: A transistor single-pole-single-throw circuit device includes at least a transistor single-pole-single-throw circuit having a first transistor and a second transistor, and an inductor capacitor (LC) resonator having an inductor and a capacitor connected in series, allowing two ends of the LC resonator connected to the first source and the first drain of the first transistor, respectively. The transistor single-pole-single-throw circuit device adopts an LC resonator having an inductor and a capacitor connected in series to connect with the first source and the first drain of the first transistor. The inductor couples and resonates with a parasitic capacitance of the transistor, to reduce signal loss due to emerged parasitic capacitance when the conventional single-pole-single-throw circuit selects a switch transistor with a larger width.

Abstract: Provided is a high-isolation switching device for a millimeter-wave band control circuit. By optimizing a cell structure to improve the isolation of an off-state without deteriorating the insertion loss of an on-state, it is possible to implement a high-isolation switching device useful in the design and manufacture of a millimeter-wave band control circuit such as a phase shifter or digital attenuator using switching characteristics. In addition, when a switch microwave monolithic integrated circuit (MMIC) is designed to use the switching device, it is not necessary to use a multi-stage shunt field effect transistor (FET) to improve isolation, nor to dispose an additional ?/4 transformer transmission line, inductor or capacitor near the switching device. Thus, chip size can be reduced, degree of integration can be enhanced, and manufacturing yield can be increased. Consequently, it is possible to reduce manufacturing cost.

Abstract: A technology which can realize a high-performance multiband operation in a compact circuit configuration and is advantageous for a wireless terminal of GSM system for which the further increase of the demands is expected in the future is provided. Provided is a multiband switch type antenna duplexer adopted in a mobile phone used in TDMA system such as the GSM system, in which the signals of respectively different first to fourth frequency bands (GSM 850, EGSM, DCS, PCS) share a single antenna, wherein switching elements such as receive filters and diodes are combined in various ways to perform the high-performance band switch with the minimum number of switching elements. The circuit of this antenna duplexer can realize not only the size reduction of the multiband switch antenna duplexer but also the size reduction and performance improvement of the wireless terminal itself.

Abstract: The present invention is a split band duplexer, which increases the separation between a transmit passband and a receive passband by splitting the transmit and receive passbands into sub-bands. Each sub-band has a bandwidth that is less than the bandwidth of the full passband. The increased separation increases isolation margins and insertion loss margins, which allows use of standard filter components, such as surface acoustic wave (SAW) filters, and their accompanying manufacturing tolerances and drift characteristics. In one embodiment of the present invention, the split band duplexer includes a first sub-band duplexer and a second sub-band duplexer. The first sub-band duplexer may provide a full bandwidth transmit passband and a receive passband that is less than full bandwidth. The second sub-band duplexer may provide a full bandwidth receive passband and a transmit passband that is less than full bandwidth.

Abstract: A switchable combiner/divider with multiple inputs/outputs is provided. The switchable combiner/divider with multiple inputs/outputs includes multiple input ports for receiving multiple incoming signals, multiple output ports, a switching part for alternately connecting the multiple input ports to output ports as a circulating configuration, and a controller for providing switching control signals to the switching part.

Abstract: An embodiment of the present invention provides an apparatus, comprising a radio frequency switch capable of using tunable dielectric capacitors as the switching element for a plurality of cross connected ports. Further, the RF switching may be accomplished by creating an RF short at a tee within said apparatus by the combination of transmission lines and the impedance provided by the tunable dielectric capacitor.

Abstract: Provided is a switching apparatus connecting a transmission line designated among transmission lines, between input and output terminals, and preventing a signal at the terminal from leaking to a control wiring, becoming a noise, and being superposed onto a signal at the other end. The switching apparatus includes: a plurality of input series switches switching the connection state between one end of the transmission lines and the input terminal according to a control signal; a plurality of output series switches switching the connection state between the other end of the transmission lines and the output terminal according to a control signal; a plurality of control wirings that supply a control signal to the input series switch and the output series switch; and a noise removal section that is provided between the input series switch and the output series switch and that reduces a noise propagated via a control wiring.

Abstract: A multi-port reconfigurable coupler includes a coupler and a switching system configured to selectively reconfigure multiple ports of the coupler for increased application flexibility and for efficiently transmitting and receiving radio-frequency signals. The multi-port reconfigurable coupler includes a transmit signal port, a termination port, a receive signal port, an antenna port, and a switching system configured to selectively couple the termination port to a predetermined termination potential based on information indicating one of a transmit only mode, and a receive only mode, and to decouple based on information indicating a transmit-receive mode.