Four port phase shifter

Details Four port phase shifter Four port phase shifter

1983-08-12

1985-09-03

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including long line elements

333161, 333246, H01P 1185

Patent

active

045395357

ABSTRACT:
A circuit for phase shifting a signal has been described incorporating a four port network containing a plurality of impedances wherein each impedance is provided by a transmission line having a predetermined characteristic impedance and predetermined phase length and wherein an input signal is coupled to the first port, an output signal is coupled to the second port, a first diode is coupled to the third port, a second diode is coupled to a fourth port and means for biasing the diodes to be conducting at first times and nonconducting at second times. The phase shifter circuit overcomes the problem of phase error, amplitude modulation and voltage standing wave ratio over a predetermined frequency range.

REFERENCES:
patent: 3571765 (1971-03-01), Friedman
patent: 3789329 (1974-01-01), Johnson
patent: 4105959 (1978-08-01), Stachejko
patent: 4205282 (1980-05-01), Gipprich
patent: 4232399 (1980-11-01), Heiter
patent: 4366454 (1982-12-01), Salzberg
Garver, Robert V., Broad Band Diode Phase Shifters, IEEE Transactions on Microwave Theory and Techniques, vol. MIT-20, No. 5, May 1972, pp. 314-323.
Atwater, Harry A., Reflection Coefficient Transformations for Phase Shift Circuits, IEEE Transactions on Microwave Theory and Techniques, vol. MIT-28, No. 6, Jun. 1980, pp. 563-568.

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