Single side band monolithic crystal filter

Details Single side band monolithic crystal filter Single side band monolithic crystal filter

H - Electricity

04

R

333/61

H04R 17/10 (2006.01) H03H 9/54 (2006.01) H03H 9/56 (2006.01)

Patent

CA 1101945

SINGLE SIDE BAND MONOLITHIC CRYSTAL FILTER Abstract of the Disclosure A monolithic band pass filter unit having an upper and a lower stopband comprising a monolithic piezoelectric crystal substrate having two adjacent electrodes on one surface thereof constituting two bilateral terminals of said filter unit, and a common electrode on the other surface opposite said two electrodes; a coupling capacitor between said two adjacent electrodes, and a capacitor interconnecting said one common electrode and a common terminal of said filter unit and having a predetermined capacitance value to substantially cancel intra-crystal coupling in said monolithic piezoelectric crystal substrate, and to introduce a pair of finite poles in only one of said upper and lower stopbands of said monolithic bandpass filter unit. - i -

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