Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1975-11-25
1977-01-25
Smith, Alfred E.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
310 82, 310 98, 333 30R, H03H 904, H03H 926, H03H 932, H01L 4110
Patent
active
040053784
ABSTRACT:
A surface acoustic wave bandpass filter having a flat frequency response in the passband and an exponentially decaying out-of-band response is realized by designing its transducer electrodes to have an appropriate number of discretely apodized interdigital fingers. The apodization or overlap coefficients H.sub.o (N) of adjacent fingers are determined from an analytically derived expression that incorporates factors for the filter time length parameter, the filter center frequency, bandwidth, transition bandwidth falloff, and a ripple reduction parameter.
REFERENCES:
patent: 3663899 (1972-05-01), Dieulesaint et al.
patent: 3699364 (1972-10-01), Gerard
patent: 3755761 (1973-08-01), Hartmann
Laker Kenneth R.
Slobodnik, Jr. Andrew J.
Matthews, Jr. Willard R.
Nussbaum Marvin
Rusz Joseph E.
Smith Alfred E.
The United States of America as represented by the Secretary of
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