Analog phase shifter

Details Analog phase shifter Analog phase shifter

1979-09-18

1981-09-08

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including long line elements

333117, 333156, H01P 118

Patent

active

042887631

ABSTRACT:
This invention relates to an analog phase shifter for radio frequency signals that employs a hybrid coupler and biased varactor diodes at its reflection terminals. The diodes are operated so that the normalized reactance is unity (equals the coupler's input impedance) at an intermediate frequency which may be the geometric mean of the end frequencies of a broad bandwidth. The couplers are cascaded in tandem for a 360.degree. phase shift. A balanced configuration of hybrid couplers is used for the phase shifter.

REFERENCES:
patent: 3400342 (1968-09-01), Putnam
patent: 3423688 (1969-01-01), Seidel
patent: 3768045 (1973-10-01), Chung
patent: 3996536 (1976-12-01), Camisa et al.
H. A. Watson, Microwave Semiconductor Devices & Their Circuit Applications, McGraw-Hill Book Co., New York 1969, Dispersive Phase Shifters, pp. 331-334.
R. V. Garver, 360.degree. Varactor Linear Phase Modulator, IEEE Transactions on Microwave Theory & Techniques, vol. MIT-17, No. 3, Mar. 1969, pp. 137-147.
C. A. Liechti, et al, Controlled Wideband Differential Phase Shifters Using Varactor Diodes, IEEE Transactions on Microwave Theory & Techniques, Oct. 1967, pp. 586-589.

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