Unidirectional surface acoustic wave filter

Details Unidirectional surface acoustic wave filter Unidirectional surface acoustic wave filter

1997-10-29

1999-11-02

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313B, 310313C, H03H 964

Patent

active

059778466

ABSTRACT:
The inside-band characteristic of an internal reflection type unidirectional surface acoustic wave filter is improved by using an internal reflection type unidirectional surface acoustic wave filter having positive and negative finger electrodes (10, 11) of the interdigital transducer and having open or short-circuit type floating electrodes (12) therebetween. The finger electrodes are subjected to weighting by a withdrawal technique and the filter is structured such that at portions wherein no electrical cross is made between the positive and negative finger electrodes, i.e., in case where adjacent finger electrodes each have the same sign as that of the positive finger electrode or negative finger electrode, the floating electrodes (13) located therebetween are not displaced from the center positions therebetween.

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K. Yamanouchi et al. "New Low-Loss Saw Filter Using Internal Floating Electrode Reflection Types of Single-Phase Unidirectional Transducer", Electronics Letters, vol. 20 No. 24, Nov. 22, 1984 pp. 989-990.
T. Kodama et al., "Design of Low-Loss Saw Filters Employeing Distributed Acoustic Reflection Transducers", IEEE 1986 Ultrasonics Symposium, pp. 59-64.

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