Method and apparatus for imparting a linear frequency response t

Wave transmission lines and networks – Coupling networks – Equalizers

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333156, H03H 703, H03H 718

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active

053111559

ABSTRACT:
A method and apparatus are disclosed for imparting a linear, but sloped, frequency response signal to a narrowband signal having a sinusoidal component at .omega..sub.0 radians per second. An illustrative embodiment comprises: a first signal divider, a first signal combiner and three signal paths between them. The first signal path advantageously comprises a first bi-phase attenuator; the second signal path advantageously comprises a first delay element; and the third signal path advantageously comprises both a second bi-phase attenuator and a second delay element. The first delay element preferably makes the second signal path substantially close to ##EQU1## seconds longer than the first signal path, where N is an integer. The second delay element preferably makes the third signal path substantially close to ##EQU2## seconds longer than the first signal path.

REFERENCES:
patent: 3551854 (1970-12-01), Endo et al.
patent: 5109793 (1991-05-01), McNab
patent: 5223808 (1993-06-01), Lee et al.
"Slope Compensating PIN Diode Attenuator", by David C. Kim, Microwave Journal, Mar. 1986, p. 181.
"Procedure Yields Effective Matched Slope-Equalizer Design" by John H. Weidman, Microwave System News, Jul. 1986, pp. 107-115.

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