Surface acoustic wave device and method for designing same using

Details Surface acoustic wave device and method for designing same using Surface acoustic wave device and method for designing same using

1996-10-18

1999-06-15

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 310313D, H03H 925, H03H 964

Patent

active

059126027

ABSTRACT:
A high-precision surface acoustic wave (SAW) device improves the frequency-temperature characteristics of a conventional surface acoustic wave device several-fold. In this high-precision surface acoustic wave device, two one-port SAW resonators, or two two-port SAW resonators, alternatively, two one-port-resonator-type, two-port-resonator-type or transversal-type filters are placed in parallel with each other. Further, these resonators or filters are excited and are elastically coupled to each other in such a way as to be in an oblique symmetry mode. Moreover, the frequency-temperature characteristics of the two elements are made to differ from each other. Furthermore, a flat frequency-temperature characteristic, which cannot be realized by a single element, is realized by being synthesized from the frequency-temperature characteristics of the two elements.

REFERENCES:
patent: 4193045 (1980-03-01), Houkawa et al.
patent: 5581141 (1996-12-01), Yamada et al.
Takagi et al., "K-Cut Saw Resonator With Both Static and Dynamic Zero Temperature Coefficients"; Proceedings of the 1996 IEEE International Frequency Control Symposium; IEEE Catalog No. 96CH35935; Jun. 5-7, 1996; pp. 278-285.

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