Elastic surface wave filter

Details Elastic surface wave filter Elastic surface wave filter

1977-12-06

1980-09-16

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333196, 358 40, H03H 904, H03H 926, H03H 932

Patent

active

042232856

ABSTRACT:
An elastic surface wave filter for use as an intermediate frequency filter in a color television receiver, comprising an input electrode provided on a piezoelectric substrate plate for converting an electric signal into elastic surface waves propagating through the surface layer of the piezoelectric substrate plate, a propagation path for the elastic surface waves in the piezoelectric substrate plate and an output electrode for converting the propagated elastic surface wave into an electric signal, wherein the fingers of the input electrode are so arranged that the position at which the overlap of the interleaved fingers is maximum is farther with respect to the output electrode than the middle point along the lengthwise direction of the input electrode and wherein the pitch between the adjacent interleaved fingers is non-uniform on both the sides of the position of the maximum overlap, whereby desired group delay and amplitude characteristics for predetermined frequencies are easily and simultaneously obtained.

REFERENCES:
patent: 3633132 (1972-01-01), Hartemann
patent: 3675163 (1972-07-01), Hartmann et al.
patent: 4030050 (1977-06-01), Deacon et al.
patent: 4047130 (1977-09-01), Lim et al.
patent: 4066985 (1978-01-01), Kuny
Hartemann et al--"Intrinsic Compensation of Sidelobes in a Dispersive Acoustic Delay Line" in Electronics Letters 15 May 1969; pp. 219-220.
Chauvin et al.--"Acoustic-Surface-Wave Television Filters" in Electronics Letters 26 Aug. 1971; pp. 491-492.
Hartmann et al.--"Impulse Model Design of Acoustic Surface-Wave Filters" in IEEE Trans on Microwave Theory and Techniques MTT 21 Apr. 1973; pp. 162-175.
Moulding et al.--"A Technique for Saw Bandpass Filter Design", 1974 Ultrasonic Symposium Proceeding, IEEE Cat. #74 CHO 896-1SU; pp. 168-171.

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