May C Tan

US Patent:

59660570, Oct 12, 1999

Filed:

Nov 18, 1997

Appl. No.:

8/972596

Inventors:

Mark Kintis - Manhattan Beach CA
May M. Tan - Torrance CA

Assignee:

TRW Inc. - Redondo Beach CA

International Classification:

H01P 516

US Classification:

333109

Abstract:

A reflection reducing directional coupler provides an output signal from a coupled signal while reducing the effect of an input signal. The directional coupler provides circuitry to divide, phase delay and vectorially add signals to provide coherent output and coupled signals and reduce reflected signals. The directional coupler also provides the capability to input a calibration signal into a system while mininimizing the effect of the calibration signal on the output signal.