Patent ID: 9281800
Filing Date: 2016-03-08
CPC Classification: H03H

Claim Text:
1. A filter device for filtering signals via a pass-band, the filter device comprising: a plurality of series resonators connected in series between an input terminal and an output terminal, each of the series resonators having a corresponding parallel resonance frequency Fp and series resonance frequency Fs; and a plurality of shunt resonators respectively connected between at least one of the series resonators and a ground voltage, each of the shunt resonators having a corresponding parallel resonance frequency Fp and series resonance frequency Fs, wherein at least one series resonator of the plurality of series resonators has a corresponding series resonance frequency Fs outside the pass-band of the filter device, and at least one other series resonator of the plurality of series resonators has a corresponding series resonance frequency Fs inside the pass-band, and/or wherein at least one shunt resonator of the plurality of shunt resonators has a corresponding parallel resonance frequency Fp outside the pass-band of the filter device, and at least one other shunt resonator of the plurality of shunt resonators has a corresponding parallel resonance frequency Fp inside the pass-band.