Acoustic wave bandpass electrical filters

Details Acoustic wave bandpass electrical filters Acoustic wave bandpass electrical filters

1981-02-20

1983-01-25

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313D, 333196, H03H 964, H03H 9145

Patent

active

043706339

ABSTRACT:
A surface acoustic wave bandpass electrical filter consists of input and output interdigital transducers (IP, OP) with an interposed track changing multistrip array (MSA). A conventional broadband array (MSA) is divided into three sub-groups of strips with respect to a center of symmetry (C) separated by different distances along the input track (T1) and the output track (T2) such that the amplitude-frequency response of the array (MSA) has a stopband centered on a predetermined frequency. If the input and output transducers (IP, OP) both have a double electrode configuration, electrode separation .lambda.o/4, providing a fundamental passband at a corresponding frequency f.sub.o and an equal amplitude passband at the third harmonic 3f.sub.o, then a separation difference of .lambda.o/6 between the sub-groups of the array (MSA) in the two tracks (T1, T2) can suppress the third harmonic passband in the filter output.

REFERENCES:
patent: 4079342 (1978-03-01), Solie

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