| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 333129000 | For providing frequency separation | 12 |
| 20080272853 | Filter That Comprises Bulk Acoustic Wave Resonators And That Can Be Operated Symmetrically On Both Ends - A filter for use with bulk acoustic waves includes an input port and an output port. The input port and the output port are symmetrically operable. Signal paths extend from a terminal of the input port to a terminal of the output port. Bulk acoustic wave resonators are in the signal pats. The bulk acoustic wave resonators are arranged symmetrically in the signal paths. A complex impedance associated with each signal path is provided for electrically matching to a corresponding connection. | 11-06-2008 |
| 20090058554 | Band switching by diplexer component tuning - A circuit and antenna arrangement includes a diplexer having a single radio frequency input/output interface and dual feed connections with an antenna adapted for use over a plurality of frequency bands. The diplexer has a capacitance connected between the radio frequency input/output interface and the antenna, and further has an additional capacitance that is selectively one of connected or not connected in parallel with the capacitance. In one embodiment the additional capacitance may be a capacitor in series with a switch, while in another embodiment the additional capacitance may be a MEMS variable capacitor. | 03-05-2009 |
| 20090058555 | ELASTIC WAVE DUPLEXER - An elastic wave duplexer includes a transmission filter chip and a reception filter chip each defined by an elastic wave filter chip and flip-chip bonded to a laminated board. A coil-shaped line including coil-shaped line patterns is provided inside the laminated board. The coil-shaped line defines an impedance matching circuit. In plan view, the transmission filter chip is disposed on one side of a center line passing through the approximate center of the laminated board and extending between a first edge and a second edge, and the reception filter chip is disposed on the other side of the center line. The coil-shaped line is disposed on the side on which the reception filter chip is disposed. | 03-05-2009 |
| 20090102579 | FREQUENCY DIVISION COUPLING CIRCUIT AND APPLICATIONS THEREOF - A frequency division coupling circuit includes first and second trace segments and first and second segregation modules. The first and second trace segments function to convey a first signal in a first frequency range and the first trace segment conveys a second signal in a second frequency range. A first port of the first segregation module transmits or receives the first signal to or from the first and second trace segments and a second port of the first segregation module transmits or receives the second signal to or from the first trace segment. A first port of the second segregation module transmits or receives the first signal to or from the first and second trace segments and a second port of the second segregation module transmits or receives the second signal to or from the first trace segment. | 04-23-2009 |
| 20090167459 | DUPLEXER - A duplexer is described herein. The duplexer includes a transmission branch configured to allow passage of signals in a transmission band. The duplexer also includes a reception branch configured to allow passage of signals in a reception band. The duplexer also includes a band rejection filter in the transmission branch configured to produce a short circuit to an electrical ground in a stopband. The stopband at least partially overlaps the reception band. | 07-02-2009 |
| 20120007692 | IMPEDANCE MATCHING APPARATUS AND METHOD OF ANTENNA CIRCUIT - An impedance matching apparatus is provided. The impedance matching apparatus includes a signal separation unit, an impedance detection unit, and an impedance matching unit. The signal separation unit separates a transmission and reception signal, and selectively passes a desired frequency corresponding to the transmission and reception signal. The impedance detection unit includes a plurality of impedances, and detects first and second electric potentials between the impedances. The impedance matching unit compares the first and second electric potentials detected by the impedance detection unit, and changes a matching factor for one of the impedances included in the impedance detection unit to match the impedances according to the compared result. | 01-12-2012 |
| 20130257561 | BROADBAND ABSORPTIVE-LOADING FILTER - In one embodiment, front end circuitry for an electronic appliance, the front end circuitry comprising: a first port configured to conduct signals from a signal source, the signals comprising a first signal and a second signal; a first filter coupled to the first port, the first filter configured to filter the first signal according to a first frequency band and output the filtered first signal for further processing; a second filter coupled to the first port and arranged in parallel with the first filter, the second filter configured to absorb the second signal according to a second frequency band that is a stopband for the first filter; and an impedance load coupled between an output of the second filter and ground. | 10-03-2013 |
| 20140009245 | Transceiver Front-End - A transceiver front-end of a communication device comprises a frequency blocking arrangement, which may be either a transmit frequency blocking arrangement or a receive frequency blocking arrangement. The frequency blocking arrangement has a blocking frequency interval associated with one of a transmit frequency and receive frequency, and a non-blocking frequency interval associated with the other of the transmit frequency and receive frequency. The frequency blocking arrangement is configured to block passage of signals in the blocking frequency interval between said signal transmission and reception node and either said receiver node or said transmitter node. The frequency blocking arrangement comprises a network of passive components comprising at least one transformer and a filter arrangement adapted to have a higher impedance value in the blocking frequency interval than in the non-blocking frequency interval. | 01-09-2014 |
| 20140055209 | FRONT-END CIRCUIT AND COMMUNICATION TERMINAL APPARATUS - A front-end circuit includes a diplexer and an impedance conversion circuit. The diplexer includes a feeding side common port through which a high-frequency signal in a high band and a high-frequency signal in a low band are input and output, a first port through which a high-frequency signal in a high band is input and output, and a second port through which a high-frequency signal in a low band is input and output, and demultiplexes or multiplexes the high-frequency signal in a low band and the high-frequency signal in a high band. The impedance conversion circuit is connected between the second port of the diplexer and an antenna port. The first port of the diplexer is directly connected to the antenna port through a transmission line. | 02-27-2014 |
| 20140118083 | ELECTRONICALLY TUNABLE ACTIVE DUPLEXER SYSTEM AND METHOD - This invention provides a novel electronically tunable active duplexer for wireless transceiver applications. It relates to an active duplexer with full-duplex operation, permitting simultaneous transmission and reception of signals at same or different frequencies. Instead of incorporating fixed or mechanically adjustable capacitors, and even instead of incorporating varactor diodes, it incorporates one or more capacitance tuning circuit in phase shifting networks enabling one to electronically tune, with ease and precision, the frequency at which isolation is desired, over a band in both transmit and receive modes of operations. | 05-01-2014 |
| 20150372658 | LOW-INSERTION-LOSS PIEZOELECTRIC ACOUSTIC WAVE BAND-PASS FILTER AND REALIZATION METHOD THEREOF - A low-insertion-loss piezoelectric acoustic wave band-pass filter and a realization method thereof are disclosed. The realization method includes: using one first kind of piezoelectric acoustic wave resonator to constitute a series branch; using one second kind of piezoelectric acoustic wave resonator to constitute a parallel branch with a ground terminal; connecting any end of the series branch with a non-ground terminal of the parallel branch to form an acoustic wave band-pass filter unit; and cascading a plurality of acoustic wave band-pass filter units; wherein an impedance value at a series resonant frequency of the first kind of piezoelectric acoustic wave resonator is less than that of the second kind of piezoelectric acoustic wave resonator; and an impedance value at a parallel resonant frequency of the first kind of piezoelectric acoustic wave resonators is less than that of the second kind of piezoelectric acoustic wave resonator. | 12-24-2015 |
| 20160156335 | HIGH-FREQUENCY MODULE | 06-02-2016 |
