Acoustic surface-wave bandpass filter

Details Acoustic surface-wave bandpass filter Acoustic surface-wave bandpass filter

1983-02-04

1985-01-08

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313B, 333195, 333196, H03H 964, H03H 9145

Patent

active

044929404

ABSTRACT:
An acoustic surface-wave bandpass filter includes a substrate made of a piezoelectric material. Acoustic surface waves travelling on a substrate surface provided with electrically conductive narrow stripes, slits or grooves undergo interference, wherein acoustic surface waves excited at frequency in VHF and UHF range are taken out as electric signals. The number of interleaved fingers constituting input transducers and output transducers of the filter is selected greater for the transducer located at the center than those disposed at both end portions. Leakage of acoustic surface-wave energy from the end transducers can be remarkably reduced, while the number of the transducers constituting the filter can be decreased. Significant reduction of loss of the filter is thus attained.

REFERENCES:
patent: 3582840 (1971-06-01), De Vries
patent: 4143343 (1979-03-01), Inoue et al.

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