초록 ▼

An antenna feed system provides reception of both circularly polarized signals and linearly polarized signals. An antenna is employed which is dual-circularly polarized and circularly polarized signals received thereby are separated into right and left hand components which are placed in phase quadr

An antenna feed system provides reception of both circularly polarized signals and linearly polarized signals. An antenna is employed which is dual-circularly polarized and circularly polarized signals received thereby are separated into right and left hand components which are placed in phase quadrature relationship by means of a 90 degree hybrid coupler. Signals received by the antenna which have dual-orthogonal linear polarization are also separated into left and right hand components in quadrature relationship by means of a 90 degree hybrid coupler. A programmable phase shifter is utilized to set the orientation of the linearly polarized reception vector. A fixed delay line and an attenuator are provided for use in balancing the amplitude and phase of the right and left hand components of the linearly polarized signals.

대표청구항 ▼

[ I claim:] [1.] 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 hyb

[ I claim:] [1.] 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.