Surface acoustic wave filter

Details Surface acoustic wave filter Surface acoustic wave filter

1975-12-19

1977-06-07

Smith, Alfred E.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

310 82, 310 98, 333 30R, H03H 904, H03H 926, H03H 932, H01L 4110

Patent

active

040286495

ABSTRACT:
A surface acoustic wave filter having a piezo-electric substrate with a major surface and input and output transducers, each haing a plurality of finger electrodes formed on the major surface to define a propagation path for surface acoustic waves. Finger electrodes of one of the transducers have a step-like configuration to divide the surface wave propagation path into a plurality of surface wave propagation channels. The phase differences of the channels and the length of the steps of the finger electrodes are selected to minimize the multiple reflection echo between the input and output transducers to reduce ripples in the pass band.

REFERENCES:
patent: 3727718 (1973-04-01), Whitehouse
patent: 3931597 (1976-01-01), Cho et al.

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