Acoustic filter with harmonic rejection

Details Acoustic filter with harmonic rejection Acoustic filter with harmonic rejection

1980-10-10

1982-06-22

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333153, 333194, H03H 964, H03H 972

Patent

active

043365159

ABSTRACT:
In order to avoid spurious responses at the third harmonic of the signal frequency, a surface acoustic wave filter employs a multi-strip track coupler in which the spacing d of the elements is an integral multiple I of the acoustic wavelength .lambda. of the third harmonic. When the condition d=I.lambda. is satisfied, the coupler blocks transmission of the third harmonic from the input transducer track to the output transducer track. This basic principle can also be used to block other frequencies.

REFERENCES:
patent: 3983517 (1976-09-01), Weglein
patent: 4048594 (1977-09-01), Weglein
patent: 4155057 (1979-05-01), Sandy et al.
Parker et al.--"Acoustic Surface--Wave Bandpass Filters", Phillips Technical Review, vol. 36, 1976, No. 2, pp. 29-43.

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