Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1996-12-27
1999-02-23
Pascal, Robert
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333195, 310313B, 310313D, H03H 925, H03H 964
Patent
active
058748687
ABSTRACT:
A longitudinal coupling type SAW resonator filter achieves improved selectivity without increasing the insertion loss and is constructed so as to be more easily mass-produced. The longitudinal coupling type SAW resonator filter has a piezoelectric substrate and first, second and third sets of interdigital electrodes each including a pair of comb electrodes disposed on the piezoelectric substrate. A pair of reflectors are located on the opposite sides in the surface wave propagation direction of the area in which the first to third sets of interdigital electrodes are disposed. The distance between the centers of adjacent electrode fingers of the first and second sets of interdigital electrode and the distance between the centers of adjacent electrode fingers of the first and third sets of interdigital electrode are set to different values.
REFERENCES:
patent: 4649357 (1987-03-01), Nagai et al.
patent: 5309126 (1994-05-01), Allen
patent: 5392013 (1995-02-01), Yamamto et al.
patent: 5426339 (1995-06-01), Wright
Patent Abstracts of Japan, vol. 004, No. 165, 15 Nov. 1980 for JP 55 115712 A, Sep. 5, 1980 (abstract only).
Murata Manufacturing Co. Ltd.
Pascal Robert
Summons Barbara
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