Patent ID: 6046655
Filing Date: 2000-04-04
Classification: H01Q

Abstract:
A system for enabling the detection of linearly polarized signals received by a circularly polarized antenna comprising:a first ninety degree hybrid coupler;feed means for separately feeding right and left hand polarized components of the signals received by said antenna to said hybrid coupler;said hybrid coupler dividing the signals into two equal parts and placing said parts in quadrature relationship with each other, said quadrature related parts comprising two separate output signals of said coupler;a phase shifter;an attenuator;a delay line connected to said attenuator; anda second ninety degree hybrid coupler;the phase shifter receiving one output signal and being programmed to set the linear orientation of the linearly polarized reception vector; the attenuator and delay line receiving the other output signal and being set to balance the amplitude and phase between the signal fed to the attenuator and the signal fed to the phase shifter;the outputs of said phase shifter and said delay line being fed to said second hybrid coupler, said second hybrid coupler dividing said signals into equal parts which are in quadrature relationship, said quadrature related signals comprising vertically and horizontally linearly polarized outputs corresponding to linearly polarized incoming signals.