Elastic surface wave device

Details Elastic surface wave device Elastic surface wave device

1979-08-24

1981-03-24

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including elastic surface wave propagation means

333154, 333194, 333196, H03H 9145, H03H 925, H03H 942, H03H 964

Patent

active

042583420

ABSTRACT:
An elastic surface wave device including interdigital finger electrodes comprising interdigital fingers each of which consists of a pair of divided finger elements having an equal width. The spacing between adjacent ones of the interdigital fingers is equal to the spacing between the pair of divided finger elements thereof. Importantly, at least one of the interdigital fingers is differentiated from the remainder of the interdigital fingers in respect of the distance from the center of the spacing between one of the interdigital fingers and that one of the interdigital fingers which is adjacent thereto on one side to the center of the spacing between the aforementioned one interdigital finger and that one of the interdigital fingers which is adjacent thereto on the other side. Furthermore, the interdigital finger electrode is designed such that the width of the respective finger elements is equal to the spacing therebetween. Such an interdigital finger element may be employed for one of the input and output electrodes of the device. Still furthermore, the spacing between adjacent ones of the interdigital fingers and the spacing between the pair of finger elements in the input electrode are made equal to those in the output electrode, respectively.

REFERENCES:
patent: 3803520 (1974-04-01), Bristol et al.
patent: 3946342 (1976-03-01), Hartmann
patent: 4126838 (1978-11-01), McCusker et al.

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