Surface wave resonator having a plurality of resonance frequenci

Details Surface wave resonator having a plurality of resonance frequenci Surface wave resonator having a plurality of resonance frequenci

1996-03-08

1998-07-14

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333193, 310313C, H03H 900, H03H 964

Patent

active

057810834

ABSTRACT:
A free edge reflective-type surface wave resonator for reflecting SH-type surface waves between two confronting free edges of a piezoelectric substrate includes a piezoelectric substrate having two confronting free edges and an interdigital transducer having a plurality of electrode fingers which are weighted by a cross width weighting method or an electrode thinning method. The weighting of the electrode fingers is performed so that an attenuation pole of a main lobe of the weighted IDT is located outside of a frequency of an attenuation pole of a normal non-weighted IDT which has the same number of electrode finger pairs as the weighted IDT. The weighting of the electrodes is such that the main lobe of the weighted IDT and a plurality of resonance characteristics determined by the attenuation poles of the normal unweighted IDT are obtained.

REFERENCES:
patent: 4007433 (1977-02-01), Houkawa et al.
patent: 4602288 (1986-07-01), Everett
patent: 5204575 (1993-04-01), Kanda et al.
Elastic Surface Wave Engineering, supervised by Inuo Shibayama, Electrical Information Communication Society Corp., pp. 66-68.
International Electrical Technology Report, No. 16, 1992, pp. 1-7.
Lecture Papers of Japan Acoustic Society, pp. 351-352 issued Mar. 1976.

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