Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1976-08-26
1978-05-23
Smith, Alfred E.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
333 32, 333 72, H03H 904, H03H 926, H03H 738, H01L 4110
Patent
active
040913457
ABSTRACT:
An electromechanical filter comprises a mechanical resonator, a pair of electromechanical transducers mechanically coupled to each other with the resonator interposed, and a pair of external matching circuits electrically connected to the respective transducers. Each matching circuit comprises a coil and a temperature-compensation capacitor connected to form a resonance circuit with the equivalent parallel capacitance of the associated transducer included therein. Resonant frequencies of the respective resonance circuits are rendered different from the passband center frequency of the filter. Preferably, the first-order temperature coefficients of the resonant frequency and the equivalent inductance of each transducer are selected to be (1) both negative and (2) positive and negative as the resonant frequency of the associated resonance circuit is rendered (1) higher and (2) lower than the center frequency.
REFERENCES:
patent: 2859416 (1958-11-01), Niederman
patent: 2955267 (1960-10-01), Mason
patent: 3792382 (1974-02-01), Guenther
"Reference Data For Radio Engineers" Fifth Edition Copyright 1968, Howard W. Sams & Co., Inc. New York; Title Page and pp. 5-22 to 5-23.
Hass - "Channeling Equipment Technology Using Electromechanical Filters" in Electrical Communication, vol. 48, Nos. 1 and 2, 1973; pp. 16-20.
Futami Takehiro
Ishiyama Yasuyuki
Kanazawa Seiichiro
Yano Takeshi
Nippon Electric Company Ltd.
Nussbaum Marvin
Smith Alfred E.
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