| Patent application number | Description | Published |
|---|
| 20080315973 | SURFACE ACOUSTIC WAVE FILTER, BOUNDARY ACOUSTIC WAVE FILTER, AND ANTENNA DUPLEXER USING SAME - A surface acoustic wave filter includes a piezoelectric substrate including lithium niobate, a series resonator including a first interdigital transducer electrode provided on the piezoelectric substrate, and a parallel resonator including a second interdigital transducer electrode provided on the piezoelectric substrate and being electrically connected to the series resonator. An apodized weighting factor of the first interdigital transducer electrode is smaller than an apodized weighting factor of the second interdigital transducer electrode. This surface acoustic wave filter has a small loss. | 12-25-2008 |
| 20090058557 | ANTENNA SHARING DEVICE - An antenna duplexer includes a piezoelectric substrate having a surface, a grounding terminal to be grounded, first and second surface acoustic wave (SAW) filters mounted on the piezoelectric substrate, first and second terminals connected to the first and second SAW filters, respectively, and a line mounted on the surface of the piezoelectric substrate between the first SAW filter and the second SAW filter. A stray coupling path is produced between the first and second terminals. A first end of the line is connected to the grounding terminal. A second end of the line opens and is coupled capacitively to the stray coupling path. The antenna duplexer has large isolation characteristic between the surface acoustic wave filters. | 03-05-2009 |
| 20100097161 | SURFACE ACOUSTIC WAVE FILTER, ANTENNA DUPLEXER AND METHOD FOR MANUFACTURING THEM - A surface acoustic wave filter comprised of a plurality of surface acoustic wave resonators having different resonance frequencies, the filter comprising a substrate made of a lithium niobate, comb electrodes ( | 04-22-2010 |
| 20100188165 | ANTENNA DUPLEXER AND COMMUNICATION APPARATUS EMPLOYING THE SAME - A small antenna duplexer that includes antenna terminal, first filter electrically connected to this antenna terminal and passing a first frequency band, second filter electrically connected to antenna terminal and passing a second frequency band, and third filter electrically connected to antenna terminal and passing a third frequency band. First filter and third filter are used for one band, and second filter and third filter are used for another band. | 07-29-2010 |
| 20100194496 | ELASTIC WAVE RESONATOR, ELASTIC WAVE FILTER, AND ANTENNA SHARING DEVICE USING THE SAME - An acoustic wave resonance device includes: piezoelectric substrate ( | 08-05-2010 |
| 20100219901 | DUPLEXER - A duplexer according to the present invention includes: an acoustic wave element having a first terminal and a second terminal; a substrate mounting the acoustic wave element on the surface; a first columnar conductor electrically connected to the first terminal, and drawn to a back surface of the substrate, while being buried partially in the substrate; a second columnar conductor electrically connected to the second terminal, and drawn to the back surface of the substrate, while being buried partially in the substrate; a first ground pattern region arranged between the first columnar conductor drawn part and the second columnar conductor drawn part on the back surface of the substrate; a second ground pattern region electrically connected to the first ground pattern region on the back surface of the substrate and arranged in the part not including the part between the first columnar conductor drawn part and the second columnar conductor drawn part; and a third columnar conductor electrically connected to the first ground pattern region, while being buried partially in the substrate. | 09-02-2010 |
| 20100219905 | SURFACE ACOUSTIC WAVE RESONATOR, AND SURFACE ACOUSTIC WAVE FILTER AND ANTENNA DUPLEXER IN WHICH THE SURFACE ACOUSTIC WAVE RESONATOR IS USED - The present invention provides a surface acoustic wave resonator capable of improving the leak of a surface acoustic wave in the transverse direction and reducing the spurious and having superior characteristics. In a surface acoustic wave filter according to the present invention, an interdigital transducer electrode and reflector electrodes are formed on a piezoelectric substrate, and a SiO | 09-02-2010 |
| 20110006855 | ELASTIC WAVE FILTER, AND DUPLEXER AND ELECTRONIC DEVICE USING SAME - An elastic wave filter has first, second, and third IDT electrodes whose wiring electrodes are connected to unbalanced signal terminal; fourth IDT electrode disposed between the first and second IDT electrodes; fifth IDT electrode disposed between the second and third IDT electrodes; and first and second balanced signal terminals connected to the wiring electrodes of fourth and fifth IDT electrodes, respectively. The ground electrodes of the first through fifth IDT electrodes are connected to the ground. Signals in opposite phase and in phase with a signal input to unbalanced signal terminal are output from first and second balanced signal terminals, respectively. The wiring electrodes of second and third IDT electrodes are adjacent to the ground electrode of fifth IDT electrode. The wiring electrode of one of first and second IDT electrodes is adjacent to the wiring electrode of fourth IDT electrode. The ground electrode of the other is adjacent to the ground electrode of fourth IDT electrode. This configuration can suppress spuriousness in the bandpass. | 01-13-2011 |
| 20110043428 | ANTENNA DUPLEXER AND COMMUNICATION DEVICE USING THE SAME - An antenna duplexer includes a transmission filter and a reception filter both coupled with an antenna terminal. A pass band of the transmission filter is lower than a pass band of the reception filter. The transmission filter includes a first series resonator coupled with a first terminal, a second series resonator connected to the first series resonator at a first node, a first parallel resonator connected to a first port of the first series resonator, a second parallel resonator connected to a first node and the first parallel resonator at a second node, a third parallel resonator connected to the first node, a fourth parallel resonator connected to the third parallel resonator at a third node, a first inductance element coupled with the second node and a ground, and a second inductance element coupled with the third node and the ground. The first and second parallel resonators and the first inductance element produce an attenuation pole at a frequency lower than a pass band of the transmission filter. The third and fourth parallel resonators and the second inductance element produce an attenuation pole at a frequency higher than a pass band of the transmission filter. The inductance of the second inductance element is lower than the inductance of the first inductance element. In this antenna duplexer, the transmission filter sufficiently suppresses a spurious caused by harmonics contained in a transmission signal. | 02-24-2011 |
| 20110063046 | SURFACE ACOUSTIC WAVE FILTER DEVICE, DUPLEXER INCLUDING THE SAME, AND ELECTRONIC APPARATUS INCLUDING THE SAME - A surface acoustic wave (SAW) filter device includes an input port for receiving an unbalanced signal, a pair of input/output ports, a first SAW filter for receiving the unbalanced signal from the input port and outputting balanced signals to the pair of input/output ports, a second SAW filter for receiving the balanced signals output from the pair of input/output ports and outputting balanced signals, and a pair of output ports for outputting the balanced signals output from the second SAW filter. The first SAW filter includes a first longitudinally-coupled SAW resonator having a first unbalanced signal input port and first and second balanced signal output ports, and a second longitudinally-coupled SAW resonator having a second unbalanced signal input port and third and fourth balanced signal output port. The first and second unbalanced signal input ports are electrically connected to the input port. The first and third balanced signal output ports both are electrically connected to one of the pair of input/output ports. The second and fourth balanced signal output ports both are electrically connected to another of the pair of input/output ports. This SAW filter device can suppress spurious and has a small insertion loss. | 03-17-2011 |
| 20110068881 | ACOUSTIC WAVE FILTER - An acoustic wave filter includes a first IDT electrode, a second IDT electrode, and a third IDT electrode. The first IDT electrode includes a first signal electrode finger connected to the unbalanced terminal, and a first ground electrode finger. The second IDT electrode includes a second signal electrode finger connected to a first balanced terminal, and a second ground electrode finger. The third IDT electrode includes a third signal electrode finger connected to the second balanced terminal, and a third ground electrode finger. A dummy electrode finger connected neither to the unbalanced terminal nor to the ground is provided on the second IDT electrode side in the first IDT electrode. Thus, the degree of balance between balanced terminals can be improved. | 03-24-2011 |
| 20110095845 | ACOUSTIC WAVE DUPLEXER - An acoustic wave duplexer includes a piezoelectric substrate, a first filter and a second filter whose center frequency is higher than that of the first filter, the first and second filters being provided on the piezoelectric substrate. The first filter is structured as a ladder type. A resonator positioned nearest to an antenna terminal out of series-arm resonators is designated as a first resonator. A pitch of a comb-shaped electrode structuring the first resonator is set such that a bulk wave emission frequency of the first resonator becomes higher than a passband of the second filter. | 04-28-2011 |
| 20110215883 | ACOUSTIC WAVE RESONATOR AND ACOUSTIC WAVE FILTER USING THE SAME - An acoustic wave resonator includes a piezoelectric substrate and first and second comb-shaped electrodes provided on the piezoelectric substrate and interdigitating with each other. The first comb-shaped electrode includes a first busbar and first electrode fingers extending in a direction non-perpendicular to a direction in which the first busbar extends. The second comb-shaped electrode includes a second busbar and second electrode fingers extending from the second busbar and interdigitating with the first electrode fingers at an interdigitating region. This acoustic wave resonator can suppress a spurious response due to a transverse mode and has a high Q value. | 09-08-2011 |
| 20110215884 | LADDER-TYPE FILTER - A ladder-type filter having plural elastic-wave resonators provided on a series arm and a parallel arm in a ladder shape on a piezoelectric substrate. Each of the elastic-wave resonators has an interdigital electrode. The interdigital electrode has plural electrode finger pairs formed of electrode fingers extending from first and second bus bars. The interdigital electrode included in the elastic-wave resonator provided on the parallel arm has an electrode cross width of the electrode fingers extending from the first and second bus bars 23 times or more of the wavelength of elastic waves excited by the interdigital electrodes. | 09-08-2011 |
| 20110221546 | ELASTIC WAVE DEVICE - An elastic wave device includes a piezoelectric substrate, an IDT electrode disposed on the piezoelectric substrate, an internal electrode disposed on the piezoelectric substrate and connected to the IDT electrode, a support pillar disposed on the piezoelectric substrate and provided around the IDT electrode, a top panel provided on the support pillar to cover a space above the IDT electrode, an insulation protector provided to cover the support pillar and the top panel, an external electrode disposed on the insulation protector, a conductor pattern disposed on the insulation protector in order to obtain inductance, and a connection electrode provided through the insulation protector, to connect the external electrode and the internal electrode to each other. | 09-15-2011 |
| 20120032753 | ANTENNA SHARER - An antenna sharer with both low loss and sharp attenuation characteristic in a wide band is achieved. Antennal sharer | 02-09-2012 |
| 20120044027 | ACOUSTIC WAVE RESONATOR AND DUPLEXER USING SAME - An acoustic wave resonator includes a piezoelectric body, an IDT electrode for exciting an acoustic wave with wavelength λ, and a dielectric thin film provided so as to cover the IDT electrode. The IDT electrode includes a bus bar electrode region, a dummy electrode region, and an IDT cross region in order from outside. The film thickness of the dielectric thin film above at least one of the bus bar electrode region and the dummy electrode region is smaller than that above the IDT cross region by 0.1λ to 0.25λ. This configuration provides an acoustic wave resonator that reduces transverse-mode spurious emission. | 02-23-2012 |
| 20120062337 | ANTENNA SHARING DEVICE - The antenna sharing device has a first elastic-wave filter for passing signals of a first frequency passband and a second elastic-wave filter for passing signals of a second frequency passband higher than the first frequency passband. The first elastic-wave filter is a ladder-type filter including a first series resonator and a second series resonator having an antiresonant frequency point higher than that of the first series resonator. The first series resonator has a first IDT electrode and a first dielectric film covering the electrode. The second series resonator has a second IDT electrode and a second dielectric film covering the electrode. The first and the second dielectric films have a first projection and a second projection, respectively, so as to be formed above the electrode fingers of each IDT electrode. The cross-sectional area of the first projection of the first series resonator is larger than that of the second projection of the second series resonator in the excitation direction of the elastic wave. The structure satisfies both of steepness in a crossband and low loss in a passband. | 03-15-2012 |
| 20120086521 | LADDER TYPE SURFACE ACOUSTIC WAVE FILTER AND DUPLEXER USING SAME - An object of the present invention is to improve the passing characteristic at high temperature in a ladder-type elastic wave filter and a duplexer including the filter. The ladder-type elastic wave filter of the present invention includes a piezoelectric substrate, a first series elastic-wave resonator formed on the piezoelectric substrate and connected in series between the input and output terminals of the filter, a parallel elastic-wave resonator formed on the piezoelectric substrate and connected in parallel between the series elastic-wave resonator and the ground terminal, and a dielectric film formed on the piezoelectric substrate so as to cover the first series elastic-wave resonator. The piezoelectric substrate is formed of a material with a negative temperature coefficient. The dielectric film is formed of a material with a positive temperature coefficient and its film thickness is formed thicker than that with which the frequency-temperature coefficient of the first series elastic-wave resonator becomes 0. | 04-12-2012 |
| 20120139662 | ELASTIC WAVE ELEMENT, AND ELECTRICAL APPARATUS AND DUPLEXER USING SAME - An acoustic wave device ( | 06-07-2012 |
| 20120218052 | ANTENNA SHARING DEVICE - Antenna duplexer ( | 08-30-2012 |
| 20120313724 | ELASTIC WAVE FILTER DEVICE AND ANTENNA DUPLEXER USING SAME - An elastic wave filter device includes a longitudinally coupled resonator-type elastic wave filter formed on a piezoelectric substrate; and a ladder-type elastic wave filter connected to the resonator-type elastic wave filter. The resonator-type filter includes an input IDT and an output IDT. The ladder-type filter includes a series arm resonator and a parallel arm resonator. A first ground electrode connected to the parallel arm resonator is electrically separated from a second ground electrode connected to at least one of the input IDT and the output IDT. | 12-13-2012 |
| 20120326801 | DUPLEXER - A duplexer includes an acoustic wave element having a first terminal and a second terminal; a substrate; a first columnar conductor electrically connected to the first terminal, and drawn to a back surface of the substrate while partially in the substrate; a second columnar conductor electrically connected to the second terminal, and drawn to the back surface of the substrate while partially in the substrate. Additionally, a first ground pattern region is between the first columnar conductor drawn part and the second columnar conductor drawn part on the back surface of the substrate; a second ground pattern region is electrically connected to the first ground pattern region and arranged in the part not including the part between the first columnar conductor drawn part and the second columnar conductor drawn part; and a third columnar conductor electrically is connected to the first ground pattern region while partially in the substrate. | 12-27-2012 |
| 20130162368 | LADDER-TYPE SURFACE ACOUSTIC WAVE FILTER AND DUPLEXER INCLUDING THE SAME - A ladder-type surface acoustic wave filter includes a first series resonator having the lowest resonance frequency among a plurality of series resonators; and a second series resonator having a resonance frequency higher than the first series resonator. The film thickness of a dielectric film in the region where the first series resonator is formed is larger than that of a dielectric film in the region where the second series resonator is formed. | 06-27-2013 |
| 20130210374 | ANTENNA DUPLEXER AND COMMUNICATION DEVICE USING THE SAME - An antenna duplexer includes a transmission filter and a reception filter both coupled with an antenna terminal. A pass band of the transmission filter is lower than a pass band of the reception filter. The transmission filter includes a first series resonator coupled with a first terminal, a second series resonator connected to the first series resonator at a first node, a first parallel resonator connected to a first port of the first series resonator, a second parallel resonator connected to a first node and the first parallel resonator at a second node, a third parallel resonator connected to the first node, a fourth parallel resonator connected to the third parallel resonator at a third node, a first inductance element coupled with the second node and a ground, and a second inductance element coupled with the third node and the ground. The inductance of the second inductance element is lower than the inductance of the first inductance element. In this antenna duplexer, the transmission filter sufficiently suppresses a spurious caused by harmonics contained in a transmission signal. | 08-15-2013 |
| 20130214872 | ELASTIC WAVE FILTER, AND DUPLEXER AND ELECTRONIC DEVICE USING SAME - An elastic wave filter has first, second, and third IDT electrodes whose wiring electrodes are connected to unbalanced signal terminal; fourth IDT electrode disposed between the first and second IDT electrodes; fifth IDT electrode disposed between the second and third IDT electrodes; and first and second balanced signal terminals connected to the wiring electrodes of fourth and fifth IDT electrodes, respectively. The ground electrodes of the first through fifth IDT electrodes are connected to the ground. Signals in opposite phase and in phase with a signal input to unbalanced signal terminal are output from first and second balanced signal terminals, respectively. The wiring electrodes of second and third IDT electrodes are adjacent to the ground electrode of fifth IDT electrode. The wiring electrode of one of first and second IDT electrodes is adjacent to the wiring electrode of fourth IDT electrode. The ground electrode of the other is adjacent to the ground electrode of fourth IDT electrode. This configuration can suppress spuriousness in the bandpass. | 08-22-2013 |
| 20130249647 | ACOUSTIC WAVE DEVICE WITH REDUCED HIGHER ORDER TRANSVERSE MODES - In an acoustic wave device, a high-order transverse mode wave which is an unnecessary wave is suppressed. The acoustic wave device includes: a piezoelectric substrate; at least one pair of IDT electrodes formed on the piezoelectric substrate; and a dielectric film which covers at least a part of the piezoelectric substrate and the IDT electrodes, and the IDT electrodes each has a plurality of electrode fingers. The dielectric film covers at least an area in which the electrode fingers are arranged interleaved with each other. An acoustic velocity of an acoustic wave in an intersection area, within the region, which is a portion from ends of the electrode fingers to a predetermined length or more inward from the ends, is greater than an acoustic velocity of an acoustic wave in an edge area including end portions of the electrode fingers. | 09-26-2013 |
| 20140001919 | ELASTIC WAVE ELEMENT | 01-02-2014 |
| 20140049341 | MULTIMODE ELASTIC WAVE DEVICE - A multimode elastic wave device includes a pair of reflectors, and a first interdigital transducer (IDT) electrode through a fifth IDT electrode arranged between the pair of reflectors. In this configuration, each of the average of electrode-finger pitches in the first IDT electrode and the average of electrode-finger pitches in the fifth IDT electrode is smaller than both of the average of electrode-finger pitches in the second IDT electrode and the average of electrode-finger pitches in the fourth IDT electrode. | 02-20-2014 |
| 20140113571 | ELECTRONIC DEVICE INCLUDING FILTER - An electronic device includes a main circuit connected between an input terminal and an output terminal, and an auxiliary circuit connected in parallel to the main circuit between the input terminal and the output terminal. The main circuit includes a filter having a first passband and a stopband. The auxiliary circuit has a passing characteristic that allows a signal having a frequency in a certain frequency band inside the stopband to pass through the auxiliary circuit. The main circuit is configured to output a main signal in response to an input signal. The auxiliary circuit is configured to output an auxiliary signal in response to the input signal. The main signal and the auxiliary signal contain phase components opposite to each other in the certain frequency band inside the stopband. This electronic device has an attenuation amount in the stopband. | 04-24-2014 |
| 20140167877 | FILTER MODULE - In a filter module capable of handling multiple bands, cross wiring with an RF-IC is to be solved. The filter module includes: an antenna terminal; first and second transmission filters; first and second reception filters; a first switch circuit connected to the antenna terminal, and selectively connected to the first and second transmission filters; a second switch circuit connected to the antenna terminal, and selectively connected to the first and second reception filters; a first matching circuit connected between the first switch circuit and the first transmission filter or between the second switch circuit and the first reception filter; and a second matching circuit connected between the first switch circuit and the second transmission filter or between the second switch circuit and the second reception filter. | 06-19-2014 |
| 20140218129 | LADDER-TYPE ELASTIC WAVE FILTER AND ANTENNA DUPLEXER USING SAME - In a ladder-type elastic wave filter, a resonance frequency of a second parallel resonator is higher than that of a series resonator and lower than an antiresonance frequency of a series resonator. With this configuration, an attenuation pole is formed by the second parallel resonator at a frequency region lower than an attenuation pole formed by the series resonator in a frequency region higher than the passband of the ladder-type elastic wave filter. | 08-07-2014 |
