Surface acoustic wave resonance device adapted to simple and pre

Details Surface acoustic wave resonance device adapted to simple and pre Surface acoustic wave resonance device adapted to simple and pre

1996-12-04

1997-12-02

Lee, Benny T.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 310313R, H03H 900, H03H 964

Patent

active

056940955

ABSTRACT:
A surface acoustic wave (SAW) resonance device includes a SAW resonator formed on a piezoelectric substrate and including driving electrodes formed in a comb-like shape and reflectors arranged in both sides of the driving electrodes, and at least one capacitor formed on the piezoelectric substrate and electrically connected to the driving electrodes. A capacitance of the capacitor is set to be a specific value in accordance with a manner of connection of the capacitor to the SAW resonator. By the constitution, it is possible to simply and precisely carry out a frequency adjustment of the SAW resonance device. It is also possible to suppress occurrence of undesirable ripples or spurious signals to thereby obtain electric characteristics equivalent to those obtained in the case where the number of pairs of driving electrodes is increased.

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Design . . . ", Prentice Hall, 1990, pp. 181 and 232; Rhea, R.W.

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