Abstract: Four frequency components (f1 to f4) (where, f1<f2<f3<f4) are input into a port (10) of a first demultiplexing filter circuit (1), and demultiplexed into low frequency components (f1 and f2) and high frequency components (f3 and f4), and input in a port (20) of a second demultiplexing filter circuit (2) and a port (30) of a third demultiplexing filter circuit (3), respectively. The frequency components (f1 and f2) are demultiplexed into the component (f1) and the component (f2) by the second demultiplexing filter circuit (2), and output from a port (23) and a port (24), respectively. The frequency components (f3 and f4) are demultiplexed into the component (f3) and the component (f4) by the third demultiplexing filter circuit (3), and output from a port (33) and a port (34), respectively.

Abstract: A duplexer/diplexer comprising at least a transmission branch and a reception branch. The transmission branch and the reception branch are modularly connected by shielding, and are arranged such that the two branches are matched to an identical value of resistance (50 Ohms) in their passband, and offer broadband high-impedance in the stopband of the band neighboring the passband. As a result, all three ports of the duplexer/diplexer are matched to the same value of resistance given parallel connection of the two branches.

Abstract: Inductor topologies for filters used in broadband applications are described. In one implementation, an apparatus, such as an interface module includes a printed circuit board and a filter. The filter includes a generally circular high Quality factor (Q) value spiral planar inductor etched directly into the printed circuit board. The generally circular high Q value spiral planar inductor is configured to operate in a broadband application. Other implementations involve the use of decoupling structures with respect to the planar inductors as well as a design methodology for the filters.

Abstract: A multilayer band separator with a grounding parasitic capacitor. The separator includes a quasi-highpass filter, a semi-lumped lowpass filter and a phase shifter. The quasi-highpass filter includes a third capacitor connected to an input signal, a fourth capacitor with one end connected to the third capacitor and the other end connected to ground, an inductive element with one end connected to ground and the other end connected to the connection point of the third and fourth capacitors, and a second capacitor with one end connected to the connection point of the third capacitor, the fourth capacitor and the inductive element and the other end connected to a second output to pass a high-frequency output signal. The phase shifter is a transmission line element connected to the input signal.

Abstract: A system and a method for providing a global positioning system (GPS) enabled antenna system are provided. The GPS enabled antenna may be used, for example, on a wireless communications device such as a wireless handset. The wireless communications device may include a switching module that can selectively switch communications signals between the antenna and one of a plurality of communications band circuits. A respective impedance matching circuit may be provided between the switching module and particular communications band circuitry to match or to tune the antenna to the particular communications band circuitry.

Abstract: A multilayer filter array, which is formed by layering a plurality of conductive patterns, includes: coils corresponding to respective plurality of lines, which are formed by arranging the plurality of conductive patterns respectively to a single insulator layer; and capacitors corresponding to respective plurality of lines, which are formed by facing the conductive patterns to each other with insulator layers therebetween on insulator layers differing from the insulator layers the coils exist thereupon, wherein only a single conductive pattern, which configures a capacitor corresponding to a respective line, of the capacitors corresponding to respective plurality of lines, is deployed on each respective insulator layer forming each of the capacitors. Accordingly, inductance and capacitance become independently adjustable, as in addition, disparity of damping characteristics between signal lines may be made smaller.

Abstract: A duplexer is provided that includes a first tunable bandpass filter, a second tunable bandpass filter and means for coupling the first bandpass filter and the second bandpass filter to an antenna. The duplexer is operated by tuning the first tunable bandpass filter to provide a passband corresponding to an assigned transmit frequency, and tuning the second tunable bandpass filter to provide a passband offset from an assigned receive frequency, when the duplexer is operated in a transmit mode. When the duplexer is operated in a receive mode, the first tunable bandpass filter is tuned to provide a passband offset from an assigned transmit frequency and the second tunable bandpass filter is tuned to provide a passband corresponding to the assigned receive frequency.

Abstract: A high-frequency switch has

Abstract: The present invention relates to a control system for selectively supplying electrical power in a remote environment. The system comprises a plurality of electrical circuits, each designed to operate over a unique frequency passband. Power transmitted within the frequency passband of a circuit is filtered through that circuit to power a corresponding remote device. One or more remote devices can be simultaneously powered by transmitting power within the frequency passbands of the corresponding circuits. It is advantageous to design relatively narrow passbands to accommodate a relatively large number of circuits and corresponding devices for remote operation and a triac, rectifier or other suitable turn-on gate can be incorporated into each circuit to effectively control the width of the frequency passband of each circuit. Alternatively, an operational amplifier could be used.

Abstract: A high-frequency module prevents distortion in first and second diodes of a high-frequency switch in a communication system which is not selected without providing a negative power source, and a communication apparatus includes such a high-frequency module. The high-frequency module includes a diplexer having inductors and capacitors, and high-frequency switches including first and second diodes, transmission lines, inductors, and capacitors.

Abstract: A high-frequency filter device includes at least one filter to be connected to a high-frequency stage of a wireless apparatus. The filter includes a voltage-controlled variable frequency resonance element which is made of a resonance element and a voltage-controlled variable impedance element electrically connected to the resonance element. The high-frequency filter device includes a control section for controlling a voltage applied to the variable impedance element, and a signal monitoring section for outputting a control signal, with which the voltage is controlled, to the control section based on frequency data as to an oscillating frequency of a local oscillator of the wireless apparatus. The signal monitoring section controls a band frequency of the at least one filter based on the frequency data in such a manner that the band frequency is adaptively changed.

Abstract: The present invention relates to a summing network comprising: a summing point (P) having interfaces for coupling summing network branches to the summing point, and an interface for coupling the summing point (P) to an antenna (ANT), and channel units (TX1 to TX3) arranged in the branches, and channel unit-specific band-pass filters (1 to 3), whose pass frequencies correspond to the frequency or frequencies of the corresponding channel unit. To facilitate tuning the summing network, a compensation element (7) is coupled to the summing network between the summing point (P) and the antenna (ANT), the load effect of said compensation element corresponding substantially to the load caused to the summing point (P) by the branches coupled to the summing point.

Abstract: A high-frequency switch has a first transmission-reception switching circuit for selectively switching between the signal transfer between an antenna terminal and a first transmitting-circuit terminal and the signal transfer between the antenna terminal and a first receiving-circuit terminal; a second transmission-reception switching circuit for selectively switching between the signal transfer between the antenna terminal and a second transmitting-circuit terminal and the signal transfer between the antenna terminal and a second receiving-circuit terminal; a first diplexer disposed between the antenna terminal and the first transmission-reception switching circuit and between the antenna terminal and the second transmission-reception switching circuit; and a second diplexer connected to the second receiving-circuit terminal to selectively switch the signal transfer between the second receiving-circuit terminal and a third receiving-circuit terminal and the signal transfer between the second receiving-cir

Abstract: In the transmission/reception unit according to the present invention, a first corner of a cover, which is located in the vicinity of transmission and reception terminals and a ground terminal of an antenna, or the vicinity of the corner, is soldered to a non-ground wiring pattern and an electrical length of the ground conductor from the ground terminal is increased. This ensures that even in a compact transmission/reception unit, the electrical length is equivalent to &lgr;/4 and the antenna gain is improved; therefore, a transmission/reception unit with a satisfactory transmission/reception sensitivity can be realized.

Abstract: The invention refers to a diplexer, particularly for use in microwave devices, comprising a low-pass filter and a high-pass filter, both having inductors and capacitors. It is suggested that at least one inductor of each of said filters is provided as an active inductor.

Abstract: A high-frequency filter device includes at least one filter to be connected to a high-frequency stage of a wireless apparatus. The filter includes a voltage-controlled variable frequency resonance element which is made of a resonance element and a voltage-controlled variable impedance element electrically connected to the resonance element. The high-frequency filter device includes a control section for controlling a voltage applied to the variable impedance element, and a signal monitoring section for outputting a control signal, with which the voltage is controlled, to the control section based on frequency data as to an oscillating frequency of a local oscillator of the wireless apparatus. The signal monitoring section controls a band frequency of the at least one filter based on the frequency data in such a manner that the band frequency is adaptively changed.

Abstract: A system and method providing millimeter wave front end circuitry utilizing waveguide E-plane bandpass filters for both out of band frequency rejection as well as reverse and spurious propagation of in band signals. Accordingly, a conductive base plate is formed having various waveguides. Circuit boards of the front end circuitry are disposed in ones of the waveguides which reject in band frequencies in order to prevent undesired coupling of signals. Additionally, waveguides rejecting out of band frequencies are coupled to the circuit boards in order to provide bandpass filters utilized by the front end circuitry.

Abstract: Tuning method for a combiner filter (2) in an antenna (3) near system for base station equipment is disclosed. Transmitted signals related to the combiner filter are compared with each other. A spectral analysis of each of the transmitted signals is performed. The spectral analysis results regarding magnitudes and/or phases of the signals are compared. The combiner filter (2) is tuned based on the analysis in an iteration procedure until the combiner filter is in accordance with predetermined conditions.

Abstract: The invention relates to a combiner (1) for electromagnetic waves that are to be sent or received in, for example, a radio base station.

Abstract: A multilayer band separator with a grounding parasitic capacitor. The separator includes a quasi-highpass filter, a semi-lumped lowpass filter and a phase shifter. The quasi-highpass filter includes a third capacitor connected to an input signal, a fourth capacitor with one end connected to the third capacitor and the other end connected to ground, an inductive element with one end connected to ground and the other end connected to the connection point of the third and fourth capacitors, and a second capacitor with one end connected to the connection point of the third capacitor, the fourth capacitor and the inductive element and the other end connected to a second output to pass a high-frequency output signal. The phase shifter is a transmission line element connected to the input signal.

Abstract: A method is provided for operating a duplexer including a first tunable bandpass filter, a second tunable bandpass filter and means for coupling the first bandpass filter and the second bandpass filter to an antenna. The method comprises the steps of tuning the first tunable bandpass filter to provide a passband corresponding to an assigned transmit frequency, and tuning the second tunable bandpass filter to provide a passband offset from an assigned receive frequency, when the duplexer is operated in a transmit mode. When the duplexer is operated in a receive mode, the first tunable bandpass filter is tuned to provide a passband offset from an assigned transmit frequency and the second tunable bandpass filter is tuned to provide a passband corresponding to the assigned receive frequency.

Abstract: A multiplexer using a ceramic filter as stacked satellite down converter is operative to reduce useless wave ranges in a wave frequency and to largely reduce external interferences with frequency ranges. The multiplexer is implemented by serially connecting a low-noise amplifier, a mixer, and an IF amplifier between a receiver and an output port of a satellite down converter, and the multiplexer is characterized in that a ceramic filter is serially connected between the IF amplifier and themixer. The ceramic filter has characteristics that enable reduction of useless wave ranges in a wave frequency and largely reduced external interference with frequency ranges.

Abstract: An antenna duplexer has

Abstract: A signal divider/combiner (11) and method combines first and second frequency signals received by microstrip patch antennas (58, 48). A first transmission line stub (28) blocks the second frequency signals on the first signal receiving path, and a second transmission line stub (20) blocks the first frequency signals on the second signal receiving path providing increased signal levels at a receiver input (10). In one embodiment, the transmission line stubs are open-circuit stubs and are positioned a quarter-wavelength from a combining junction (12) formed from stripline transmission lines (14, 32, 50). The transmission line stubs (28, 20) also reduce radiation of the first frequency signal by the second antenna as well as radiation of the second frequency signal by the first antenna. In one embodiment, the first and second frequency signals are the L1 and L2 signals provided by the Global Positioning System.

Abstract: A spurious signal reduction circuit which is connected to a main signal line. The spurious signal reduction circuit comprises a resistor having a terminal connected to the main signal line, an LC parallel resonance circuit and an LC series resonance circuit. The parallel resonance circuit has a resonance frequency which is equal to a main signal frequency and has a terminal connected to another terminal of the resistor. The series resonance circuit has a resonance frequency which is equal to a spurious signal frequency and has a terminal connected to the other terminal of the resistor.

Abstract: The invention comprises a low-noise amplifier of the type comprising a transistor exhibiting a saturation phase for signals of high amplitude. According to the invention, at the output of the amplifier is arranged a load impedance referring back to this output an optimal impedance for maximizing the power at the output of the transistor and an open circuit in the reception frequency band. Thus, the entire parasitic signal is “boxed in” by the load impedance. Particular application in the field of bidirectional transmissions, especially transmission systems linking a terminal comprising the device according to the invention with at least one satellite or a terrestrial base station.

Abstract: In a dual-mode bandpass filter, a metal film is partially formed on one surface of a dielectric substrate or at a certain vertical level within the dielectric substrate, first and second input/output coupling circuits are coupled to the metal film, at least one capacitor is loaded to the metal film so that when an input signal is applied from either input/output coupling circuit, two resonant modes generated in the metal film are coupled. The capacitor preferably includes via-hole electrodes opposing the metal film.

Abstract: The present invention aims to realize, in regard to a high frequency switch used for a mobile communication apparatus such as a portable telephone or the like, a dual band switch having simple structure and changeable to ON and OFF states in two bands. For realizing the aim, the present invention provide a dual band switch comprising a series circuit of a PIN diode (101) and its compensation circuit (102), and, the compensation circuit (102) is formed with a circuit having at least two series resonance points and one parallel resonance point. The above structure allows the impedance of the compensation circuit, which is capacitive in low frequency close to a direct current, to be inductive after undergoing the first series resonance point, whereby the parasitic capacity of the diode is canceled in the first band, and also to be inductive again after undergoing the parallel resonance point and the following series resonance point, whereby the parasitic capacity of the PIN diode is canceled in the second band.

Abstract: A method is provided for operating a duplexer including a first tunable bandpass filter, a second tunable bandpass filter and means for coupling the first bandpass filter and the second bandpass filter to an antenna. The method comprises the steps of tuning the first tunable bandpass filter to provide a passband corresponding to an assigned transmit frequency, and tuning the second tunable bandpass filter to provide a passband offset from an assigned receive frequency, when the duplexer is operated in a transmit mode. When the duplexer is operated in a receive mode, the first tunable bandpass filter is tuned to provide a passband offset from an assigned transmit frequency and the second tunable bandpass filter is tuned to provide a passband corresponding to the assigned receive frequency.

Abstract: A filter assembly includes a transmission filter, a reception filter, a change-over switch, and phase circuits. The transmission filter has first and second ends electrically connected to a first antenna terminal and a transmission terminal, respectively. The reception filter has a first end electrically connected to a second antenna terminal via the change-over switch, and a second end electrically connected to a reception terminal. A main antenna is connected to the first antenna terminal, and a diversity antenna is connected to the second antenna terminal. The change-over switch performs switching control to connect the reception filter to one of the first and second antenna terminals. Thus, the filters utilize a fixed number of resonators regardless of switching control of the change-over switch, thereby achieving optimum filter characteristics.

Abstract: A high-frequency filter device including at least one filter to be connected to a high-frequency stage of a wireless apparatus, in which the filter includes a voltage-controlled variable frequency resonance element which comprises a resonance element and a voltage-controlled variable impedance element electrically connected to the resonance element. In the high-frequency filter device, which is connected to a receiver-side antenna, a signal monitoring section monitors unnecessary interfering signals of a received signal of a receiver of the wireless apparatus and generates a control signal for reception by an adaptive control algorithm, and a control section controls a band elimination filter by a control voltage signal based on the control signal so that an elimination band of the band elimination filter of the receiving filter maximizes a ratio of a desired received signal to interfering waves.

Abstract: A composite high frequency component and a mobile communication apparatus incorporating the same which needs no matching circuits and can easily be miniaturized. The composite high frequency component is constituted of a diplexer, high frequency switches, high frequency filters, and surface acoustic wave filters. The diplexer is formed by first inductors and first capacitors. The high frequency switches are formed by diodes, second inductors, and second capacitors. The high frequency filters are formed by third inductors and third capacitors.

Abstract: A high-frequency switch has

Abstract: A communication circuit includes a first transceiver circuit, a second transceiver circuit, and a transformer. The transformer includes a single core, an input coil, and first and second output coils. The input coil is configured to be coupled to a signal source. The first output coil is coupled to the first transceiver circuit, and the second output coil is coupled to the second transceiver circuit.

Abstract: There is disclosed a duplexer comprising: a first external terminal; a second external terminal; an antenna terminal; a first frequency variable filter electrically connected between the first external terminal and the antenna terminal, and composed of at least one resonator and a reactance element electrically connected to the resonator and capable of being voltage-controlled; a second frequency variable filter electrically connected between the second external terminal and the antenna terminal, and composed of at least one resonator and a reactance element electrically connected to the resonator and capable of being voltage-controlled; the predetermined reactance element of the first frequency variable filter being in the on state when the reactance element of the second frequency variable filter is in the on state.

Abstract: A multiplexer circuit adapted to receive standard cellular telephone signals and PCS signals without user intervention comprises two filter circuits. The first filter circuit presents a high impedance to signals outside the standard cellular frequency range from one antenna and the second circuit presents a high impedance to signals outside the higher PCS frequency range from a second antenna. A cell phone adapted to receive both frequency ranges will automatically detect the appropriate signal.

Abstract: A multiplexer circuit adapted to receive signals comprises two filter circuits. The first filter circuit presents a high impedance to signals outside a first frequency range and the second circuit presents a high impedance to signals outside a second frequency range. Isolation matching circuits enable transmission and reception of one of the signals in the first or second frequency ranges without degradation or interference with the other range. An embodiment allows transmission and reception of satellite Orbcomm frequencies over a standard AM/FM antenna without effect on the AM/FM signal.

Abstract: The invention provides a filtering device of the transmission-reception switched type which can be constructed in a form with a reduced size at a low cost without having to use circuit elements such as a capacitor, a coil, and a transmission line forming a phase shift circuit which are not essential to the filtering device. Inner conductors serving as distributed-parameter resonance lines are formed in a dielectric block. There is provided a coupling line coupled with particular inner conductors. The open-circuited ends of these particular inner conductors are connected to an outer conductor via corresponding diode switches so that transmission and reception filters are switched from each other when either diode switch is selectively turned on.

Abstract: The present invention relates to a multiplexer/demultiplexer for use in mobile communication devices and provides a small and low-loss multiplexer/demultiplexer. The present invention provides a multiplexer/demultiplexer including a first to a third ports each externally terminated with a pure resistance, in which the second port is made to be a common port by connecting between the first port and the ground a first resonant circuit which makes serial resonance at a frequency within a first frequency band or in its proximity, and further connecting an inductive element in series between the first port and the second port, and connecting between the third port and the ground a second resonant circuit which makes serial resonance at a frequency within a second frequency band which is different from the first frequency band or in its proximity, and further connecting a capacitive element in series between the third port and the second port.

Abstract: A crossover network for partitioning by frequency and electrical audio signal from an amplifier into a plurality of frequency bands for presentation to respective drivers or transducers. Such a crossover network couples the respective transducers in a parallel fashion thereby locking the in-phase relationships of signals presented to the respective transducers. The present facilitates a smooth transition between high and low frequencies without creating an abrupt crossover region wherein the phase relationships interject distortion.

Abstract: A method for characterizing a frequency response of a tunable filter (11) includes the steps of adjusting a tuning means (12) to a first predetermined position; measuring the resonance frequency of the filter (10); temporary storing the measured resonance frequency and the position; and repeating these steps for a number of different predetermined positions of the tuning means. A mathematical function representing tuning means position as a function of resonance frequency is then determined, whereby several advantages are achieved. Little memory is required and the function provides for rapid and accurate tuning of the filter.

Abstract: A high-frequency dielectric ceramic composition comprises Ba, Ti, Nd, Sm, and Pr as primary components represented by the formula xBaO-yTiO2-z{(1−m−n)Nd2O3-mSm2O3-nPr2O11/3} wherein coefficients x, y, z, m, and n represent molar ratios, x+y+z=1, 0<m≦0.40, 0<n≦0.25, and the coefficients x, y, and z are in an area bounded by points A, B, C and D in a ternary diagram, wherein point A is at (x=0.16, y=0.70, z=0.14), point B is at (x=0.16, y=0.68, z=0.16), point C is at (x=0.13, y=0.68, z=0.19), and point D is at (x=0.13, y=0.70, z=0.17); wherein the composition further comprises a Bi compound in an amount of more than 0 parts by weight to about 9 parts by weight on the basis of Bi2O3 and an Fe compound in an amount of more than 0 parts by weight to about 0.

Abstract: An AM/FM/WB/CB/cellular telephone antenna includes a first frequency self-resonant circuit at a position above the lower end of the antenna such that the electrical length of the lower section of the antenna is equivalent to one-quarter wavelength for a frequency in the FM frequency range and a second frequency self-resonant circuit disposed below the first frequency self-resonant circuit. The first self-resonant circuit presents a high impedance in the FM frequency band and the second self-resonant circuit presents a high impedance in the cellular frequency range. The entire length of the antenna is equivalent to one-quarter wavelength in a frequency in the CB frequency band. The antenna wire is wound around a fiberglass core, and the FM self-resonant circuit is formed by a tightly wound, coiled section of the wire together with a thin-walled brass tube extending over the core in the area of the tightly wound section.

Abstract: Tuning method for a combiner filter (2) in an antenna (3) near system for base station equipment is disclosed. Transmitted signals related to the combiner filter are compared with each other. A spectral analysis of each of the transmitted signals is performed. The spectral analysis results regarding magnitudes and/or phases of the signals are compared. The combiner filter (2) is tuned based on the analysis in an iteration procedure until the combiner filter is in accordance with predetermined conditions.

Abstract: A self terminating coaxial cable connector comprising a conductive casing and an opening there through; the opening having a first end, an insulator inserted in the opening; a conductive spring connected to a terminal; an insulative plug in the first end, the insulative plug having a central opening for receiving the central conductor of a coaxial cable at the first end; a first plate conductively connected to the conductive spring; and a resistive element at the first end conductively connected the conductive casing and positioned such that the conductive spring holds the first plate in contact with the resistive element when the cable is not connected to the self terminating coaxial cable connector and the central conductor of cable separates the first plate and the resistive element when it is connected to the self terminating coaxial cable connector.

Abstract: An apparatus and a method for simultaneously transporting telephone signals and broadband signals on a single coaxial cable. The ring line and tip line of the telephone signals are dc coupled onto the inner and outer conductors of the coaxial cable, while the information wire and reference ground of the broadband signal are ac coupled onto the inner and outer conductors of the coaxial cable respectively. Low pass filters at each end of the coaxial cable pass the telephone signal in and out of telephone jacks while blocking the broadband signals. High pass filters at each end of the coaxial cable allow the broadband signals to pass in and out of coaxial connectors while blocking the telephone signals. The coaxial cable is isolated from earth ground to prevent shorting of the telephone electrical power to earth ground. A ground block may be added to connect the reference ground of the incoming broadband signal to earth ground.

Abstract: A test equipment interface circuit capable of acting as an interface between a wireless transceiver and a piece of test equipment for both high frequency band signals and low frequency band signals without the use of active or mechanical switches.

Abstract: A user terminal in the form of a handset 1 is disclosed wherein a common antenna 3 is operative to provide transmission and reception on a plurality of selectable services at different frequencies, the antenna being resonant and matched for at least one of the services, and non-resonant and unmatched for other services. The user terminal handset 1 employs a common antenna 3 directly for that service or those services for which the antenna 3 is matched and resonant. The user terminal handset 1 employs the common antenna 3 unmatched and non-resonant for those services whereon unmatched non-resonant antenna use is acceptable. The user terminal handset 1 comprises means, for approximately or precisely adjusting the match to the common antenna 3 for other services.

Abstract: A high-frequency component which requires no shielding electrodes and in which there are no limitations upon the places where plural sets of filter components can be formed. In one embodiment, a high-frequency component has first to third ports, and includes a BPF connected between the first port and the second port and a BRF connected between the first port and the third port. The BPF and BRF comprise transmission lines and capacitors formed on a plurality of laminated dielectric layers. In another embodiment, the component comprises an HPF and an LPF formed on a plurality of dielectric layers. In both cases, the passbands of the respective filters are predetermined not to substantially overlap one another.

Abstract: A device is to be coupled and used with a standard non-power providing directional tap and includes a power coupling unit and a power combining unit. The power coupling unit is adapted to be connected to an output port of the directional tap. The power coupling unit filters out RF signals from the output port and outputs an AC power signal from the output port. The power combining unit includes at least two sets of combining circuits with a common input port connected to the power coupling unit so as to receive the AC power signal therefrom. Each combining circuit has an RF input signal port adapted to be connected to a respective one of the RF signal ports of the directional tap so as to receive the RF signal therefrom, and a combined output signal port with an output which is the AC power signal from the common input port and the RF signal from the RF input signal port.