Method and apparatus for electrically adjusting delay in...

Details Method and apparatus for electrically adjusting delay in... Method and apparatus for electrically adjusting delay in...

2004-09-21

2008-11-25

Pascal, Robert J. (Department: 2817)

Wave transmission lines and networks

Coupling networks

Delay lines including a lumped parameter

C333S140000, C333S156000, C333S164000

Reexamination Certificate

active

07456706

ABSTRACT:
An apparatus and method for providing an electrically adjustable RF delay in which a splitter splits an input signal into two signal paths, one signal path providing a delay fixed at an integral number of wavelengths of a desired center frequency and both signal paths providing electrically adjustable attenuation. A combiner combines the signals passing through the signal paths, such that the sum of the electrically-adjustable attenuation provided by the signal paths adds to unity, whereby the input signal is delayed by an adjustable time depending upon the attenuations provided by the signal paths.

REFERENCES:
patent: 3423688 (1969-01-01), Seidel
patent: 4153886 (1979-05-01), Miedema
patent: 5019793 (1991-05-01), McNab
patent: 5355103 (1994-10-01), Kozak
patent: 2006/0164145 (2006-07-01), Poskatcheev
International Search Report—PCT/US2004/31028 dated Feb. 22, 2005.

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