.pi.-section digital phase shifter apparatus
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United States of America Patent
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Aug 5, 1986
Grant Date -
N/A
app pub date -
Aug 20, 1985
filing date -
Aug 20, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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