초록 ▼

An object is to provide for receiving a circularly polarized signal from an antenna feed (10) connected to orthogonally spaced antenna elements (11, 12, 13, 14) and for transmitting a linearly polarized signal through the same feed without switches, and without suffering a 3 dB polarization mismatch

An object is to provide for receiving a circularly polarized signal from an antenna feed (10) connected to orthogonally spaced antenna elements (11, 12, 13, 14) and for transmitting a linearly polarized signal through the same feed without switches, and without suffering a 3 dB polarization mismatch loss, using an arrangement of hybrid junctions. The arrangement is comprised of two dividing hybrid junctions (15, 16), each connected to a different pair of antenna elements and a summing hybrid junction (17). In one embodiment, a receiver (18) is connected to the summing hybrid junction directly. A diplexer (19a or 19b) is used to connect a transmitter (20a or 20b) to only one pair of antenna elements. In an alternative embodiment, designated left and right circularly polarized (LCP and RCP) transmitters (21, 22) are connected to the summing hybrid junction by separate diplexers (23, 24), and separate LCP and RCP sensitive receivers (25, 26) are connected to the diplexers in order to transmit linearly polarized signals using all four antenna elements while receiving circularly polarized signals as before. An orthomode junction (30) and horn antenna (32) may replace the two dividing hybrid junctions (15, 16) and antenna feed (10).

대표청구항 ▼

A system for coupling an antenna feed to means having one port for receiving circularly polarized signals and to means having one port for transmitting linearly polarized signals comprising two transmission paths, means connected to said antenna feed for dividing a received circularly polarized sign

A system for coupling an antenna feed to means having one port for receiving circularly polarized signals and to means having one port for transmitting linearly polarized signals comprising two transmission paths, means connected to said antenna feed for dividing a received circularly polarized signal into separate linearly and orthogonally polarized signals in said two transmission paths, a quadrature hybrid junction having two input ports, each connected to one of said two transmission paths, and one output port, and having its output port connected to said one port of said receiving means for combining said two linearly and orthogonally polarized signals into a circularly polarized signal, and diplexing means for coupling said one port of said linearly polarized transmitting means into at least one of said two transmission paths for transmitting a linearly polarized signal through said antenna feed.