Surface acoustic wave filter

Details Surface acoustic wave filter Surface acoustic wave filter

1975-02-24

1976-06-22

Smith, Alfred E.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

310 98, 333 30R, H03H 926, H03H 930, H03H 932, H03H 904

Patent

active

039654460

ABSTRACT:
This invention comprises in combination a body of piezoelectric material, means for propagating an acoustic wave in a first mode, means for converting a portion of the acoustic wave energy into an acoustic wave in a second mode, a resonant structure in which the acoustic wave energy in the second mode is resonant, means for reconverting the acoustic wave energy in the second mode into surface acoustic wave energy in the first mode, means for providing a predetermined phase shift of the reconverted acoustic wave energy relative to the original propagated acoustic wave energy, and means for recovering the combined acoustic wave energy of the original and phase shift reconverted acoustic wave energies as an electric output signal.

REFERENCES:
patent: 3716809 (1973-02-01), Reeder et al.
patent: 3781717 (1973-12-01), Kuenemund
patent: 3836876 (1974-09-01), Marshall et al.
patent: 3882430 (1975-05-01), Maerfeld
patent: 3886504 (1975-05-01), Hartmann et al.

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