Low pass T-section digital phase shifter apparatus

Details Low pass T-section digital phase shifter apparatus Low pass T-section digital phase shifter apparatus

1985-08-20

1986-12-16

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including a lumped parameter

333138, 333164, H03H 720

Patent

active

046300104

ABSTRACT:
A low pass T-section digital phase shifter apparatus having a pair of serially connected inductor-diode combinations connected in series which includes a parallel circuit connected between the common junction and ground. The parallel circuit has an inductor in parallel with a series capacitor and diode to provide a balanced insertion loss at each diode switching state. When the diodes are in the forward-biased state they act as closed short circuit switches. When the diodes are reversed-biased, the inductance in the series circuit resonates with the diode capacitance to provide a short path to the RF signal to pass the center frequency of the RF signal at the desired phase.

REFERENCES:
patent: 2585841 (1952-02-01), Richardson
patent: 2585842 (1952-02-01), Richardson
patent: 3718873 (1973-02-01), Garver
patent: 3748499 (1973-07-01), Schaffner
patent: 3778733 (1973-12-01), Rizzi
patent: 4275367 (1981-06-01), Gaglione et al.
Ghirardi--"Radio Physics Course", Radio and Technical Publishing Co., New York City, 1937; pp. 216-217.
"Broad-Band Diode Phase Shifters," by R. V. Garver, in IEEE Transactions on Microwave Theory and Techniques, vol. MTT-20, No. 5, May 1972, pp. 314-323.
"Simplified Switched Line Phase Shifter," by A. Schwarzmann, in DEP Symposium on MIC's, May 1971.

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