Acoustic filter with harmonic rejection

Details Acoustic filter with harmonic rejection Acoustic filter with harmonic rejection

H - Electricity

03

H

333/58

H03H 9/64 (2006.01)

Patent

CA 1172713

Zenith Docket No. 4144 H? Docket No. 973 ABSTRACT OF THE DISCLOSURE 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.

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