Acoustic wave bandpass electrical filters

Details Acoustic wave bandpass electrical filters Acoustic wave bandpass electrical filters

1982-04-12

1984-01-24

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313D, 333195, 333196, H03H 964

Patent

active

044279566

ABSTRACT:
A surface acoustic wave bandpass electrical filter has double electrode input and output transducers (IP and OP) whose combined amplitude-frequency response has a fundamental passband centered on a frequency f.sub.o and a corresponding third harmonic passband. An interposed multistrip coupler (MSA2) has strips (ST) with a mark-to-space ratio of one-to-one and a center-to-center spacing .lambda..sub.S2 /2 chosen such that f.sub.o /f.sub.S2 is in the range 0.80 to 1.14 but excluding substantially 1.0, whereby a stopband in the amplitude-frequency response of the coupler (MSA2) between 2f.sub.S2 and 4f.sub.S2 suppresses the amplitude-frequency response of the input and output transducers (IP and OP) over a range of frequencies including 3f.sub.o .+-.0.5f.sub.o.

REFERENCES:
patent: 4336515 (1982-06-01), De Vries et al.
patent: 4357584 (1982-11-01), Murray et al.
patent: 4370633 (1983-01-01), Schofield

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