Elastic surface wave device

Details Elastic surface wave device Elastic surface wave device

1975-10-14

1976-11-02

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

With impedance matching

310 98, 333 72, H03H 926, H03H 930, H03H 904, H03H 932

Patent

active

039900231

ABSTRACT:
An elastic surface wave device comprises a piezoelectric substrate and at least one pair of first and second interdigital electrodes provided on the surface of the piezoelectric substrate, in which when a width of one digit section in the first interdigital electrode is represented by l1 and a width of one digit section in the second interdigital electrode adjacent the one digit section in the first interdigital electrode is by l2 and when a clearance between the adjacent digit sections of the interdigital electrode pair is represented by l3 and the central frequency of the fundamental of a surface wave is by f0, the following relation is established: ##EQU1## L1/VM + L3/VF = 1/4F0 L3/VF + L2/VM = 3/4F0
Where

REFERENCES:
patent: 3839687 (1974-10-01), Subramanian
patent: 3882433 (1975-05-01), Subramanian
Toda et al.--"Surface Wave Delay Lines with Interdigital Transducers on PZT Ceramic Plates" in Japanese Journal of Applied Physics, vol. 10 No. 6, June 1971; pp. 671-677.

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