Patent application number | Description | Published |
20080204149 | CRYOGENIC RECEIVING AMPLIFIER AND AMPLIFYING MEHTOD - The present invention discloses a cryogenic receiving amplifier using a gallium nitride high electron mobility transistor (GaN HEMT) as an amplifying device in a cryogenic temperature environment. The cryogenic receiving amplifier includes an input matching circuit which makes an impedance matching between a gate of the amplifying device and an outside of an input terminal, a gate biasing circuit which applies a DC voltage to the gate of the amplifying device, an output matching circuit which makes an impedance matching between a drain of the amplifying device and an outside of an output terminal, and a drain biasing circuit which applies a DC voltage to the drain of the amplifying device. The cooled temperature is preferably set to 150 K or below, and the GaN HEMT may be illuminated with light of a blue LED. | 08-28-2008 |
20080204168 | VARIABLE RESONATOR, TUNABLE FILTER, AND ELECTRIC CIRCUIT DEVICE - A variable resonator that comprises a loop line ( | 08-28-2008 |
20080204169 | VARIABLE RESONATOR, TUNABLE BANDWIDTH FILTER, AND ELECTRIC CIRCUIT DEVICE - A variable resonator that comprises a loop line ( | 08-28-2008 |
20080238578 | COPLANAR WAVEGUIDE RESONATOR AND COPLANAR WAVEGUIDE FILTER USING THE SAME - A coplanar waveguide resonator ( | 10-02-2008 |
20080268796 | RADIO COMMUNICATION DEVICE AND POWER SUPPLYING METHOD FOR RADIO COMMUNICATION DEVICE - A radio communication device in which the output transmission signal of a high-frequency power amplifying part is sent out to an antenna via a circulator, a high-frequency signal reflected from the antenna is transferred via the circulator to a rectifying part to obtain a direct current power, and the direct current power is supplied to a power amplifying part or another constituent part in the radio communication device as an aid to the power supply from a power supply unit. | 10-30-2008 |
20080278260 | MATCHING CIRCUIT - First, second and third matching parts | 11-13-2008 |
20080278265 | DUAL BAND RESONATOR AND DUAL BAND FILTER - A signal input/output line | 11-13-2008 |
20080279122 | LEAKAGE POWER REDUCTION APPARATUS - A circulator extracts a transmission signal sent from a transmitter to antenna via the circulator and a duplexer, reflected by an antenna, and returned via the duplexer to the transmitter side. The amplitude and phase of the extracted signal are adjusted by an amplitude-and-phase adjuster to generate an offset signal having the same amplitude and the opposite phase with respect to a leaking transmission signal included in a signal output from a third terminal of the duplexer when combined by a combiner. The offset signal is combined in the combiner with the leaking transmission signal included in the signal output from the third terminal of the duplexer to suppress the leaking transmission signal. | 11-13-2008 |
20080309426 | IRREVERSIBLE CIRCUIT ELEMENT - An irreversible circuit element is configured by including a magnetic substance, a plurality of central conductors L | 12-18-2008 |
20090002069 | VARIABLE CIRCUIT, COMMUNICATION APPARATUS, MOBILE COMMUNICATION APPARATUS AND COMMUNICATION SYSTEM - A variable circuit that has a device that changes the mechanical state thereof and has a characteristic that is changed by a change of the mechanical state of the device, the variable circuit including: a controlling section | 01-01-2009 |
20090066443 | SIGNAL SELECTING DEVICE - A signal selecting device according to the present invention has two input/output ports, a plurality of resonating parts, a plurality of impedance transforming parts, and a controlling part. The resonating parts have a ring conductor having a length equal to one wavelength at a resonant frequency or an integral multiple thereof and a plurality of switches each of which is connected to a different part of the ring conductor at one end and to a ground conductor at the other end. The controlling part controls the state of the switches. The resonating parts are disposed in series between the two input/output ports. The impedance transforming parts are disposed between the input/output ports in such a manner that the impedance transforming parts at the both ends are disposed between the input/output port and the resonating part and the remaining impedance transforming parts are disposed between the resonating parts. | 03-12-2009 |
20090121803 | DUPLEXER AND TRANSCEIVER - A duplexer according to the present invention includes a first port, a second port and a third port for external input/output, a first path formed between the first port and the third port, a second path formed between the second port and the third port, a phase shifting part provided for each path, and a resonating part provided for each path. At least any of the resonating parts has a ring conductor having a length equal to one wavelength at a resonant frequency or an integral multiple thereof, a plurality of passive circuits, and a plurality of switches each of which is connected to a different part of the ring conductor at one end and to any of the passive circuits at the other end. A switch may simply be connected to a ground conductor instead of being connected to the passive circuit. | 05-14-2009 |
20090167458 | MATCHING CIRCUIT - The present invention has for its object to provide a matching circuit with multiband capability which can be reduced in size, even if the number of handled frequency bands rises. The matching circuit of the present invention comprises a load having frequency-dependent characteristics, a first matching block connected with one end to the load with frequency-dependent characteristics, and a second matching block formed by lumped elements connected in series to the first matching block. And then, when a certain frequency band is used, matching is obtained with the series impedance of the first matching block and the second matching block. When a separate frequency band is used, a π-type circuit is constituted by connecting auxiliary matching blocks to both sides of the second matching block. Next, at the same frequency, by taking the combined impedance of this π-type circuit and a load whose characteristics do not depend on the frequency to be Z | 07-02-2009 |
20090179711 | MATCHING CIRCUIT - The present invention has for its object to provide a matching circuit with multiband capability which can be reduced in size, even if the number of handled frequency bands rises. The matching circuit of the present invention comprises a load having frequency-dependent characteristics, a first matching block connected with one end to the load with frequency-dependent characteristics, and a second matching block formed by lumped elements connected in series to the first matching block. And then, when a certain frequency band is used, matching is obtained with the series impedance of the first matching block and the second matching block. When a separate frequency band is used, a π-type circuit is constituted by connecting auxiliary matching blocks to both sides of the second matching block. Next, at the same frequency, by taking the combined impedance of this π-type circuit and a load whose characteristics do not depend on the frequency to be Z | 07-16-2009 |
20090206942 | NON-RECIPROCAL CIRCUIT DEVICE - A non-reciprocal circuit device comprising a magnetic plate F | 08-20-2009 |
20090212886 | DUAL-BAND BANDPASS RESONATOR AND DUAL-BAND BANDPASS FILTER - A dual-band bandpass filter according to the present invention includes a plurality of dual-band bandpass resonators. The dual-band bandpass resonator includes a central conductor having a central axis aligned with an input/output direction, a pair of grounding conductors, a central conductor short-circuit part and a pair of stub conductors that are formed on a surface of a dielectric substrate. The pair of grounding conductors are disposed on the opposite sides of the central conductor with a space interposed therebetween. The central conductor short-circuit part short-circuits the pair of grounding conductors, and one end of the central conductor is connected to the central conductor short-circuit part. The pair of stub conductors are disposed in the spaces on the opposite sides of the central conductor symmetrically with respect to the central axis of the central conductor, extend at least partially parallel with the central conductor and are connected to the central conductor short-circuit part at one ends thereof. | 08-27-2009 |
20090264089 | MULTI-BAND LOOKUP TABLE TYPE PREDISTORTER - A lookup table type predistorter for reading out distortion compensation data by using a difference signal between a power amplifier input signal and an output signal as a reference signal; wherein N input side variable band signal extractors extract transmitting signals in N frequency bands from the input signal, N output side variable band signal extractors extract signals in N frequency bands from the output of power amplifier, and N difference detectors detect differences between N frequency band signals respectively detected at the input side and the output side as N reference signals, which are used to read out N compensation data from N lookup tables, the N compensation data are added to the transmitting signals in N frequency bands, and N results of addition are combined to produce an output of the predistorter. | 10-22-2009 |
20090315622 | FEEDFORWARD AMPLIFIER AND CONTROL METHOD THEREOF - In a feedforward amplifier ( | 12-24-2009 |
20100060356 | POWER SERIES PREDISTORTER AND CONTROL METHOD THEREOF - A power series predistorter of the present invention includes a delay path for delaying a signal, a distortion generation path having an N-th order distortion generator and a vector adjuster, a divider for dividing an input signal between the delay path and the distortion generation path, a combiner for combining the output signal of the delay path and the output signal of the distortion generation path, and a controller for controlling the vector adjuster. The controller includes a setting unit, a distortion component measurement unit, a minimum condition calculation unit, and a recording unit. The setting unit specifies the phase or amplitude value of the vector adjuster. The distortion component measurement unit measures the distortion component of a power amplifier. The minimum condition calculation unit obtains a phase or amplitude value that minimizes the distortion component by function approximation, using the magnitude of the distortion components corresponding to three or more phase or amplitude values specified for sampling by the setting unit. | 03-11-2010 |
20100194491 | MULTIBAND MATCHING CIRCUIT AND MULTIBAND POWER AMPLIFIER - A multiband matching circuit includes a first matching unit, a second matching unit, and a third matching unit, with all units being connected in series in a signal path. Matching with target impedance is established at a first frequency by appropriately designing the first matching unit and at a second frequency by appropriately designing the second and third matching units. The second matching unit and the third matching unit are designed to make the conversion ratio of the impedance viewed from the connection point between the second matching unit and the third matching unit to a circuit element to the target impedance smaller than the conversion ratio of the impedance viewed from the connection point between the first matching unit and the second matching unit to the circuit element to the target impedance, at the second frequency. | 08-05-2010 |
20100295612 | POWER SERIES DIGITAL PREDISTORTER AND CONTROL METHOD THEREFOR - A power series digital predistorter includes a combiner which combines an output from a linear transmission path with an output from an odd-order distortion generating path, an analog-to-digital converter which converts a feedback signal from an output of a power amplifier to a digital feedback signal, an odd-order distortion vector control part which controls vector adjustment performed by an odd-order distortion vector adjusting part in the odd-order distortion generating path, a cancellation signal generating part which generates a cancellation signal from an input transmission signal, a combiner which is inserted in a feedback signal path and which combines the cancellation signal with a signal from the feedback signal path, and a cancellation signal control part which controls the cancellation signal generating part so that the cancellation signal suppresses a main signal component in the feedback signal at the combiner. | 11-25-2010 |
20110050339 | POWER SERIES DIGITAL PREDISTORTER AND DISTORTION COMPENSATION CONTROL METHOD THEREFOR - A power series digital predistorter and a distortion compensation control method for the power series digital predistorter are capable of adjusting the coefficients of a frequency characteristic compensator at high speed. A controller in the power series digital predistorter collectively sets adjustment amounts for the phases in bands in an N-th order frequency characteristic compensator; collectively sets adjustment amounts for the amplitudes in the bands in the N-th order frequency characteristic compensator; determines whether an index indicating the degree of cancellation of a distortion component generated in a power amplifier satisfies a preset condition; and, if the index does not satisfy the condition, performs control such that the adjustment amounts for the phases and the adjustment amounts for the amplitudes are set again. | 03-03-2011 |
20110080230 | BIAS CIRCUIT - A bias circuit includes: a bias supply terminal | 04-07-2011 |
20110115574 | VARIABLE RESONATOR AND VARIABLE FILTER - A switch is replaced with a parallel resonant circuit | 05-19-2011 |
20110210789 | POWER SERIES DIGITAL PREDISTORTER AND DISTORTION COMPENSATION CONTROL METHOD THEREOF - Coefficients W | 09-01-2011 |
20110215886 | MULTIROLE CIRCUIT ELEMENT CAPABLE OF OPERATING AS VARIABLE RESONATOR OR TRANSMISSION LINE AND VARIABLE FILTER INCORPORATING THE SAME - A variable resonator includes a first transmission line | 09-08-2011 |
20110316652 | MULTIBAND RESONATOR AND MULTIBAND-PASS FILTER - An multiband resonator of the present invention includes a dielectric substrate including three or more dielectric layers, a ground conductor, a main-line conductor, a sub-line conductor, a sub open stub, a main open stub, a short-circuit conductor, a main through conductor, and a sub through conductor. The short-circuit conductor electrically connects one end of the main-line conductor to one end of the sub-line conductor and to the ground conductor. The main through conductor electrically connects the other end of the main-line conductor to one end of the main open stub that is aligned with that other end of the main-line conductor. The sub through conductor electrically connects the other end of the sub-line conductor to one end of the sub open stub that is aligned with that other end of the sub-line conductor. | 12-29-2011 |
20120032751 | VARIABLE IMPEDANCE MATCHING CIRCUIT - A variable impedance matching circuit includes a series or parallel connection of a fixed inductive element and a first variable capacitive element and a second variable capacitive element connected in series with the serial or parallel connection. The susceptance of the circuit can be changed by changing the capacitances of the variable capacitive elements. | 02-09-2012 |
20120044026 | MULTIBAND MATCHING CIRCUIT - A multiband matching circuit of the present invention includes an inductive element having one end connected to an input terminal, a first switch having one end connected to the other end of the inductive element and the other end grounded, a capacitive element having one end connected to the input terminal, a second switch having one end connected to the other end of the capacitive element and the other end grounded, a first-band matching circuit that is connected between the other end of the inductive element and a first output terminal and performs impedance matching in a first frequency band, and a second-band matching circuit that is connected between the other end of the capacitive element and a second output terminal and performs impedance matching in a second frequency band higher than the first frequency band. | 02-23-2012 |
20120176205 | VARIABLE MATCHING CIRCUIT - A first line stub SB | 07-12-2012 |
20130002374 | VARIABLE RESONATOR, VARIABLE BANDWIDTH FILTER, AND ELECTRIC CIRCUIT DEVICE - A variable resonator includes a ring-shaped conductor line ( | 01-03-2013 |