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OwnerRobert A. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Frosch, Boris L. Seidel +1inventors
InventorsRobert A. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Frosch, Boris L. Seidel, Dan A. Bathker
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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).
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
In a two-way signal transmission system for receiving circularly polarized signals at a receiver 18 and transmitting linearly polarized signals from a transmitter, the combination comprising
Dependencies are inferred from the claim text.