.pi.-section digital phase shifter apparatus

Details .pi.-section digital phase shifter apparatus .pi.-section digital phase shifter apparatus

1985-08-20

1986-08-05

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including a lumped parameter

333 23, 333161, 333164, 307320, H03H 720, H01P 1185

Patent

active

046045937

ABSTRACT:
An extra high frequency .pi.-section digital phase shifter apparatus having a diode connected between two identical parallel shunt circuits. The parallel shunt circuits connect to the series inductor/diode circuit at both the input and output and each parallel shunt circuit has inductor connected in parallel with a capacitor and a diode to provide balanced insertion loss at each diode switching state. When the diodes of the circuit are in the forward-biased state they act as closed short circuit switches. When the diodes are reverse-biased, the inductance in the shunt circuit resonates with the diode capacitance to provide a short circuit path to the RF signal at the center frequency of the RF signal at the desired phase.

REFERENCES:
patent: 3196368 (1965-07-01), Potter
patent: 3278866 (1966-10-01), Bose
patent: 3718873 (1973-02-01), Garver
patent: 3745487 (1973-07-01), Milard et al.
patent: 4001734 (1977-01-01), Burns
patent: 4423393 (1983-12-01), Freitag et al.
"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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