Accurate fast-switching cross polarization repeater using non-reciprocal solid-state phase shifters

摘要

In a system for receiving an input signal, for example, at radar frequencies, having polarization components and transmitting an output signal which is cross polarized with respect to an input signal, separate transmit and receive phase shift networks are utilized. Consequently, the phase shift circuitry utilized need not be reciprocal, in order to provide accurate cross polarization.

主权项

1. An rf cross-polarization repeater comprising, in combination:
an rf antenna adapted to receive an input signal and to separate said signal into orthogonally related polarization components; an rf receiver; a first transmission channel connecting said antenna and said receiver, said first channel being adapted to transmit said polarization components of said input signal in separate subchannels; first adjustable phase shift means included in said first channel; first detection means connected to said receiver for adjusting said first phase shift means to null the signal presented to said receiver by one of said subchannels; a second rf transmission channel coupled to said first channel at the antenna end thereof, said second channel having two subchannels connected to the subchannels of said first channel; second adjustable phase shift means included in said second channel; testing means for presenting a test signal to said receiver by applying a signal to one of the subchannels of said second channel and for simultaneously adjusting said second phase shift means to null the signal thus presented to said receiver by one of the subchannels of said first channel; a transmitter connected to the other of the subchannels of said second channel; and sequencing means for operating first said first detecting means, then said testing means and then said transmitter in a recurring sequence to transmit from said second channel a pulsed output signal which maintains a substantially cross-polarized state with respect to the polarization state of said input signal.