Patent ID: 9559413
Date: 2017-01-31
CPC Classifications: H01P,H01Q

Claim:
1. An antenna feed circuit, comprising: a first feed terminal; a first waveguide-type hybrid circuit comprising a first waveguide-type hybrid circuit first terminal to connect to the first feed terminal, a first waveguide-type hybrid circuit second terminal to output a high frequency signal of a reference phase, and a first waveguide-type hybrid circuit third terminal to output the high frequency signal of 90° lagging phase from that of the high frequency signal of the second terminal at a transmission frequency; a second waveguide-type hybrid circuit comprising a second waveguide-type hybrid circuit first terminal to connect to the first waveguide-type hybrid circuit second terminal, a second waveguide-type hybrid circuit second terminal to output the high frequency signal of the reference phase, and a second waveguide-type hybrid circuit third terminal to output the high frequency signal of 90° lagging phase from that of the high frequency signal of the second waveguide-type hybrid circuit second terminal at the transmission frequency; a pair of first and second waveguide-type polarization converters to receive as input the high frequency signal from the second waveguide-type hybrid circuit second terminal, and to output the high frequency signal at the transmission frequency with a polarization oriented the same as the polarization of the input high frequency signal, by rotation of the polarization at the same angle in mutually opposite directions; a pair of third and fourth waveguide-type polarization converters to receive as input the high frequency signal from the second waveguide-type hybrid circuit third terminal, and to output the high frequency signal at the transmission frequency with the polarization oriented the same as the polarization of the input high frequency signal, by rotation of the polarization at the same angle in mutually opposite directions; a third waveguide-type hybrid circuit comprising a third waveguide-type hybrid circuit first terminal to connect to the first waveguide-type hybrid circuit third terminal, a third waveguide-type hybrid circuit second terminal to output the high frequency signal of the reference phase, and a third waveguide-type hybrid circuit third terminal to output the high frequency signal of 90° lagging phase from that of the high frequency signal of the third waveguide-type hybrid circuit second terminal at the transmission frequency; a pair of fifth and sixth waveguide-type polarization converters to receive as input the high frequency signal from the third waveguide-type hybrid circuit third terminal, and to output the high frequency signal at the transmission frequency with the polarization oriented the same as the polarization of the input high frequency signal, by rotation of the polarization at the same angle in mutually opposite directions; a pair of seventh and eighth waveguide-type polarization converters to receive as input the high frequency signal from the third waveguide-type hybrid circuit second terminal, and to output the high frequency signal at the transmission frequency with the polarization reversed in orientation from that of the polarization of the input high frequency signal, by rotation of the polarization in the same direction; and a main waveguide comprising: