Band-pass filter with surface acoustic wave devices

Details Band-pass filter with surface acoustic wave devices Band-pass filter with surface acoustic wave devices

1976-05-05

1977-12-13

Smith, Alfred E.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

310313, 310367, 333 30R, H03H 926, H03H 932, H03H 1300

Patent

active

040632024

ABSTRACT:
At least one of several transducers on a piezoelectric substrate is externally short-circuited by a series resonance circuit for suppression of triple transit echoes. The resonance circuit is additionally connected to an amplifier via a high input or output impedance. In multi-transducer systems any two transducers are prevented from communicating via echo signals by such resonance circuits. In filter cascades several resonance circuits may be included in the interstage coupling circuit or between the input and output amplifiers on the one hand and the cascade on the other hand.

REFERENCES:
patent: 3715674 (1973-02-01), Bahr
patent: 3790828 (1974-02-01), Chao
patent: 3831116 (1974-08-01), Davis, Jr. et al.
patent: 3965446 (1976-06-01), Craven et al.
Smith et al., Design of Surface Wave Delay Lines with Interdigital Transducers in IEEE Transactions on Microwave Theory and Techniques, vol. MTT-17, No. 11, Nov. 1969: pp. 865-873.
Smith et al., Analysis of Interdigital Surface Wave Transducers by Use of an Equivalent Circuit model in IEEE Transactions on Microwave Theory and Techniques, vol. MTT-17, No. 11, Nov. 1969: pp. 856-864.

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