Surface elastic wave device

Details Surface elastic wave device Surface elastic wave device

1986-06-02

1987-08-25

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including elastic surface wave propagation means

333153, 333154, 333194, 310313D, H03H 9145, H03H 942

Patent

active

046895868

ABSTRACT:
A surface acoustic wave (SAW) device comprises a piezo-electric surface acoustic substrate, and plural sets of input/output interdigital electrodes disposed on the substrate. A phase shifter is provided between a sending electrode and a reflecting electrode included in the input or output interdigital electrodes for producing an electrical phase difference to implement a unidirectional electrode. The sending electrode and the reflecting electrode are mutually connected through the phase shifter including two pure reactance elements serially connected between the sending and the reflecting electrodes and a pure reactance element connected to the junction between the two serially connected reactance elements so as to form a T-circuit. When the two serially connected pure reactance elements are selected equal to each other, the operating frequency band is broadened. The phase shifter includes no ohmic resistance and thus is lossless.

REFERENCES:
patent: 4422000 (1983-12-01), Yamada et al.
patent: 4516093 (1985-05-01), Nyffeler
patent: 4602228 (1986-07-01), Yamada
Yamada et al-"Relation of the Insertion Loss and Triple Transit Echo in SAW Unidirectional Transducers", Japanese Journal of Applied Physics, vol. 22 (1983), Supplement 22-3; pp. 163-164.
Miller et al-"A Comparison of Feeding Techniques for Group-Type Unidirectional Transducers", IEEE 1981 Ultrasonics Symposium; pp. 1-6.
Japanese Unexamined Utility Model Application No. 3614/1983 (1983); 2 pages.

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