Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1999-01-15
2000-04-11
Lee, Benny
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333195, 310313D, H03H 964
Patent
active
060492600
ABSTRACT:
A surface acoustic wave filter includes IDTs on an input side and on an output side, the Inter Digital Transducers (IDTs) are formed by depositing a thin film made of aluminum and the like on a piezoelectric substrate made of crystal, and disposed on the substrate with a spacing interposed therebetween. The width of each electrode digit of each IDT is 1/4 of the wavelength of the surface acoustic wave during resonance. A reflection coefficient .epsilon. per electrode digit and the total number N of pairs of the electrode digits constituting the IDTs on the input side and on the output side are set to satisfy N.epsilon..gtoreq.0.55. Also, the aperture width W.lambda. of a surface acoustic wave transmission path, the center frequency of the filter f in units of Hertz , and the thickness of the electrode digits H in units of meters, are set to satisfy fH.ltoreq.-17.5W+210.
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Yamamoto Yasushi
Yoshimoto Susumu
Lee Benny
NEC Corporation
Summons Barbara
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