Elastic surface wave devices

Details Elastic surface wave devices Elastic surface wave devices

1976-07-14

1977-12-27

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

With impedance matching

310345, 333 72, H03H 904, H03H 926, H03H 930, H01L 4118

Patent

active

040657345

ABSTRACT:
The elastic surface wave device comprises a piezoelectric substrate having a dielectric constant of .epsilon..sub.2, a dielectric film having a dielectric constant of .epsilon..sub.1 and a thickness of h, and deposited on the piezoelectric substrate, and an inter-digital type input-ouput transducer formed on the dielectric film. The ratio of the dielectric constants .epsilon..sub.1 /.epsilon..sub.2, and a function 2.pi./.lambda..multidot.h proportioned to the thickness of the dielectric film are selected to satisfy a condition established in a frustum shaped region bounded by coordinate points P (.epsilon..sub.1 /.epsilon..sub.2 = 1/5,(2.pi./.lambda.).multidot.h = 0.1), Q(.epsilon..sub.1 /.epsilon..sub.2 = 1/5,(2.pi./.lambda.).multidot.h = 0.00016), R(.epsilon..sub.1 /.epsilon..sub.2 = 1/500,(2.pi./.lambda.).multidot.h = 0.0004), and S(.epsilon..sub.1 /.epsilon..sub.2 = 1/500, (2.pi./.lambda.).multidot.h = 0.006) on a graph wherein the ratio .epsilon..sub.1 /.epsilon..sub.2 is represented on the ordinate and the function (2.pi./80 ).multidot.h on the abscissa, where .lambda. represents the wavelength of the elastic surface wave. As a result, the energy of the elastic surface waves is propagated from the input transducer to the output transducer with a sufficiently large power.

REFERENCES:
patent: 3655429 (1972-04-01), DeKlerk
patent: 3760299 (1973-09-01), Vasile
patent: 3965444 (1976-06-01), Willingham et al.
Deklerk-"Multilayer Thin Film Piezoelectric Transducers" in IEEE Trans. on Sonics and Ultrasonics, vol. SU13, No. 3, Aug. 1966 (reprint); pp. 100-103.

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