Piezoelectric ceramic filter circuit and piezoelectric...

Details Piezoelectric ceramic filter circuit and piezoelectric... Piezoelectric ceramic filter circuit and piezoelectric...

H - Electricity

03

H

H03H 9/58 (2006.01) H03H 9/10 (2006.01) H03H 9/56 (2006.01)

Patent

CA 2139763

Multiple piezoelectric ceramic filter elements have different center frequencies from each other and are cascade connected together. The piezoelectric ceramic filter elements satisfy the condition 0 ~dF0~ / BW3 < 0.8; where ~dF0~ is the absolute value of the frequency difference dF0 between the center frequencies, and BW3 is the band width, wherein the amplitude loss is 3dB or less. Thereby, a low insertion loss and an improvement in the group delay characteristics can be compatible at the same time.

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