Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1976-09-15
1978-11-21
Smith, Alfred E.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
333 30R, H03H 904, H03H 920, H03H 926, H03H 1300
Patent
active
041268377
ABSTRACT:
An impedance element is disclosed which is formed with an electro-elastic surface wave transducing device composed of a substrate for the propagation of an elastic surface wave and an electro-elastic surface wave transducer disposed on the substrate for converting an electrical signal into an elastic surface wave or vice versa. The impedance element has a frequency-impedance characteristic that it exhibits a sufficiently high impedance in a predetermined frequency band but a sufficiently low impedance in the other frequency bands.
Further, a band-rejection filter is disclosed which includes the abovesaid impedance element and has a band-rejection filter characteristic dependent upon the frequency-impedance characteristic of the impedance element.
REFERENCES:
patent: 3760204 (1973-09-01), Yester, Jr.
Geffe - "Simplified Modern Filter Design," John F. Rider Publisher, Inc., New York, 1963; pp. 52-54 & title page.
Ishihara Fujio
Koyamada Yahei
Nippon Telegraph and Telephone Public Corporation
Nussbaum Marvin
Smith Alfred E.
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