Acoustic surface wave interaction device

Details Acoustic surface wave interaction device Acoustic surface wave interaction device

1977-08-30

1979-03-06

Church, Craig E.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333151, H03H 904, H03H 926, H03H 932, H03H 4110

Patent

active

041433432

ABSTRACT:
An acoustic surface wave interaction device includes a plate of dielectric material provided with two transducers each having at least one pair of comb-shaped electrode arrays having a plurality of teeth. The teeth in one comb-shaped electrode array of each pair are interleaved with the teeth of the other comb-shaped electrode array. At least one transducer has the pair of comb-shaped electrode arrays divided into two or more pairs of comb-shaped electrode arrays which are electrically connected in series, while the length of teeth is varied so that the tip ends thereof are enveloped by a curve representing the inverse Fourier transform of the transfer function of the device. The number of pairs of interleaving teeth to be included in one divided pair of electrode arrays is determined by the length of interleaving of the teeth in order to provide each divided pair of electrode arrays with the same impedance.

REFERENCES:
patent: 3633132 (1972-01-01), Hartemann
patent: 3675054 (1972-07-01), Jones et al.

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