Electromechanical filter and resonator

Details Electromechanical filter and resonator Electromechanical filter and resonator

1977-09-13

1979-01-30

Smith, Alfred E.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

333 72, H03H 904, H03H 924, H03H 926

Patent

active

041375114

ABSTRACT:
An electromechanical resonator, in the form of a single planar body, comprises a flexurally vibrating resonating element coupled at its midplane to a pair of torsionally vibrating couplers. Unwanted flexural modes in the resonator are substantially reduced by selecting a length-to-width ratio of the resonating element ranging between 3 and 4. A bandpass filter comprising a plurality of such electromechanical resonators may operate essentially free of spurious responses over a band of at least 200 kHz.

REFERENCES:
patent: 3064213 (1962-11-01), Mason
patent: 3264585 (1966-08-01), Poschenrieder
patent: 3490056 (1970-01-01), Warren et al.
patent: 3638145 (1972-01-01), Papadakis
Mason et al.-"A compact Electromechanical band-pass filter for frequencies below 20 kilicycles" in IRE Trans. on Ultrasonic Engineering, Jun. 1960; pp. 59-70.
Papadakis-"Improvements in a broadband electromechanical filter in the voice band" in IEEE Trans. on sonics and ultrasonics, vol. SU22, No. 6, Nov. 1975; pp. 406-415.

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