Patent application number | Description | Published |
20110254639 | DUPLEXER AND ELECTRONIC DEVICE - A ladder type filter includes series resonators connected in series between an input terminal and an output terminal, parallel resonators connected in parallel between the input terminal and the output terminal, a resonator connected in series with the series resonators between the input terminal and the output terminal, the resonator having a resonance frequency lower than resonance frequencies of the series resonators, and an inductor connected in parallel with the resonator. According to the present ladder filter, signals having frequencies away from the pass band can be suppressed by an attenuation pole formed by the inductor. it is further possible to suppress the insertion loss in the pass band by the resonator. | 10-20-2011 |
20120126913 | DUPLEXER - A duplexer with a reduced filter loss is provided. The duplexer includes two or more filters F | 05-24-2012 |
20120182088 | DUPLEXER - A duplexer includes a reception filter that is connected between a reception terminal and an antenna terminal and includes one or a plurality of series resonators that are acoustic wave resonators, and a transmission filter that is connected between a transmission terminal and the antenna terminal and includes one or a plurality of acoustic wave resonators, a resonance frequency of a first series resonator that is one of the one or the plurality of series resonators and is closest to the antenna terminal in the reception filter being higher than an upper limit frequency of a reception band of the reception filter. | 07-19-2012 |
20120274416 | LADDER FILTER, DUPLEXER AND MODULE - A ladder filter includes at least one series resonator connected in series between an input terminal and an output terminal, at least one parallel resonator connected in parallel with the at least one series resonator, an additional resonator connected in series between the at least one series resonator and one of the input terminal and the output terminal, and an inductor connected in series to the additional resonator, the additional resonator having a resonance frequency higher than an anti-resonance frequency of the at least one series resonator. | 11-01-2012 |
20120274421 | FILTER, DUPLEXER AND COMMUNICATION MODULE - A filter includes at least one series resonator and parallel resonators, the at least one series resonator and the parallel resonators including excitation electrodes and reflectors, the parallel resonators having different resonance frequencies, and at least one of the parallel resonators other than the parallel resonator having the highest resonance frequency being configured to have a pitch of reflectors that is smaller than that of excitation electrodes. | 11-01-2012 |
20120286895 | LADDER FILTER, DUPLEXER AND MODULE - A ladder filter includes at least one series resonator connected in series between an input terminal and an output terminal, at least one parallel resonator connected in parallel with the at least one series resonator, and an inductor connected in parallel with the at least one series resonator. The at least one series resonator and the inductor generate a first attenuation pole at a frequency equal to or lower than a frequency band defined by the at least one series resonator and the at least one parallel resonator. The first attenuation pole is located at a frequency that is equal to or higher than a resonance frequency of a parallel resonator that is included in the at least one parallel resonator and has a highest resonance frequency and that is equal to or lower than a high-frequency end of the pass band. | 11-15-2012 |
20130113576 | DUPLEXER, FILTER AND COMMUNICATION MODULE - A duplexer includes: a transmit filter that is connected between an antenna terminal and a transmit terminal and has a plurality of acoustic wave resonators; a receive filter that is connected between the antenna terminal and a receive terminal and has a plurality of acoustic wave resonators; and a delay line or a longitudinal coupling type resonator that is connected in parallel with at least one of the plurality of acoustic wave resonators of the transmit filter and the plurality of acoustic wave resonators of the receive filter and has at least two IDTs (Interdigital Transducers). | 05-09-2013 |
20130127566 | FILTER AND DUPLEXER - A filter includes: first series resonators and first parallel resonators that are connected in a ladder shape between an input terminal and an output terminal; a first inductor that is connected in parallel to at least one first series resonator; one or more second parallel resonators that are provided separately from the first parallel resonators, are connected between the input terminal and the output terminal, and have a resonance frequency and an anti-resonance frequency at frequencies lower than a passband formed by the first series resonators and the first parallel resonators; wherein an attenuation region is formed by a first attenuation pole formed by the at least one first series resonator and the first inductor and a second attenuation pole formed by a resonant response of the one or more second parallel resonators. | 05-23-2013 |
20130147578 | DUPLEXER - A duplexer includes: a first filter of which first and second ends connect to a common terminal and a first terminal respectively; and a second filter having a passband higher than that of the first filter, a first end and second end thereof connecting to the common terminal and a second terminal respectively, wherein a phase shifter is located neither between the first filter and the common terminal nor between the second filter and the common terminal, the second filter is a ladder-type filter including piezoelectric thin film resonators connected in a ladder shape, a propagation constant in a direction perpendicular to a thickness direction of a piezoelectric thin film in the piezoelectric thin film resonator is a real number at frequencies lower than a resonance frequency of the piezoelectric thin film resonator, and a resonator at a first stage is a parallel resonator in the second filter. | 06-13-2013 |
20130314173 | FILTER, DUPLEXER, AND COMMUNICATION MODULE - A filter includes: acoustic wave resonators connected between an input terminal and an output terminal; and a cancel circuit including an input connection portion and an output connection portion connected so that the cancel circuit is connected in parallel to at least a part of the acoustic wave resonators, wherein the cancel circuit includes a first acoustic wave resonator connected between a node between the input connection portion and the output connection portion and a ground. | 11-28-2013 |
20140049340 | ACOUSTIC WAVE FILTER, DUPLEXER, AND MODULE - An acoustic wave filter includes: at least a parallel resonator, wherein at least one of the parallel resonator includes a piezoelectric substance, an IDT located on the piezoelectric substance, and reflectors located on the piezoelectric substance so as to sandwich the IDT, and a distance between a first electrode finger that is an electrode finger closest to the reflector among electrode fingers of the IDT and a second electrode finger that is an electrode finger closest to the IDT among electrode fingers of the reflector is less than 0.25(λ | 02-20-2014 |
20140111287 | FILTER, DUPLEXER AND COMMUNICATION MODULE - According to an aspect of the invention, each of a filter, a duplexer and a communication module includes a plurality of series resonators connected to a signal line in series and a plurality of parallel resonators connected to the signal line in parallel. At least two of the plurality of parallel resonators are connected to the signal line between two of the plurality of series resonators in parallel, inductors are respectively connected to the at least two parallel resonators, and the inductors have different inductances from each other. | 04-24-2014 |
20140361850 | RESONATOR, FILTER, AND DUPLEXER - A resonator includes: a first comb-shaped electrode including a first bus bar, first electrode fingers coupled to the first bus bar and extending in an extension direction, and first dummy electrode fingers coupled to the first bus bar; and a second comb-shaped electrode including a second bus bar, second electrode fingers coupled to the second bus bar, extending in the extension direction, and facing the first dummy electrode fingers through first gaps, and second dummy electrode fingers coupled to the second bus bar and facing the first electrode fingers through second gaps, wherein 0.5λ≦ΔD where ΔD represents a distance in the extension direction between at least two gaps that are at least adjoining two of the first gaps or/and at least adjoining two of the second gaps, and λ represents pitches of the first electrode finger and the second electrode finger. | 12-11-2014 |
20150084716 | DUPLEXER - A duplexer includes a reception filter that is connected between a reception terminal and an antenna terminal and includes one or a plurality of series resonators that are acoustic wave resonators, and a transmission filter that is connected between a transmission terminal and the antenna terminal and includes one or a plurality of acoustic wave resonators, a resonance frequency of a first series resonator that is one of the one or the plurality of series resonators and is closest to the antenna terminal in the reception filter being higher than an upper limit frequency of a reception band of the reception filter. | 03-26-2015 |