T-section digital phase shifter apparatus

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

1985-08-20

1986-07-29

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including a lumped parameter

307320, 307606, 333161, 333164, H03H 720, H01P 1185

Patent

active

046033106

ABSTRACT:
An extra high frequency T-section digital phase shifter apparatus having a pair of back to back diodes connected between the input and output terminals with a parallel circuit connected between the common junction and ground. The shunt parallel circuit has an inductor in parallel with the series combination of a capacitor and a 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 and in the shunt circuit, the inductance resonates with the diode capacitance to provide a perfect transmission for the RF signal.

REFERENCES:
patent: 3196368 (1961-12-01), Potter
patent: 3718873 (1973-02-01), Garver
patent: 3778733 (1973-12-01), Rizzi
patent: 4225367 (1981-06-01), Gaglione et al.
patent: 4255724 (1981-03-01), Bergero
"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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