Transducer electrodes for filters or delay lines utilizing surfa

Details Transducer electrodes for filters or delay lines utilizing surfa Transducer electrodes for filters or delay lines utilizing surfa

1977-04-01

1979-07-03

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Delay lines including elastic surface wave propagation means

310313, 333194, H03H 904, H03H 930, H03H 926, H01L 4110

Patent

active

041602196

ABSTRACT:
The invention relates to transducer electrodes for filters or delay lines using surface wave principles on piezoelectric substrates wherein parallel mounted electrodes have interdigital fingers extending toward the electrodes and wherein feeders for the fingers have widths of one half the wave length of the surface wave at the mean filter frequency so as to equalize and eliminate reflections in the device.

REFERENCES:
patent: 3663899 (1972-05-01), Dieulesaint et al.
patent: 3768032 (1973-10-01), Mitchell
patent: 4023124 (1977-05-01), Parker et al.
Mason et al., "Physical Acoustics", Academic Press, 1970, New York and London, Title page and pp. 229-233.

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