Ladder-type piezoelectric filter having higher input and output

Details Ladder-type piezoelectric filter having higher input and output Ladder-type piezoelectric filter having higher input and output

1989-06-08

1991-12-31

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310311, H03H 9205

Patent

active

050775448

ABSTRACT:
A ladder-type piezoelectric filter having a plurality of piezoelectric resonator elements connected to a series branch and a plurality of piezoelectric resonator elements connected to a parallel branch wherein each of the series and parallel piezoelectric resonator elements positioned on the input and output terminal sides, respectively, has a Qm value larger than that of the remaining series and parallel piezoelectric resonator elements, thereby improving a group delay frequency characteristic while suppressing any increment of an insertion loss.

REFERENCES:
patent: 3517350 (1970-06-01), Beaver
patent: 4353045 (1982-10-01), Matsui et al.
patent: 4398162 (1983-08-01), Nagai
patent: 4841264 (1989-06-01), Oshikawa
Jumonji, H.; "High inpedence piezoelectric ceramic resonators and their application to ladder filters"; Electronics and Communication in Japan,; vol. 53-A, No. 8; 1970; pp. 17-23.

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