| 摘要 |
A polarized signal receiver waveguide assembly, or feedhorn, for receiving a selected one of linearly polarized electromagnetic signals in one waveguide of circular cross-section and for launching or transmitting the selected signal into a second waveguide of rectangular cross-section, the axes of the waveguides being disposed at right angle. A probe comprising a signal receiver portion disposed in a plane perpendicular to the axis of the first waveguide and a launch or transmitter portion having its axis perpendicular to the axis of the second waveguide has its launch or transmitter portion mounted in a controllably rotatable dielectric rod, such that rotation of the rod causes rotation of the signal receiver portion for alignment with a selected one of the polarized signals. The transmission line between the probe signal receiver portion and launch or transmitter portion consists of a pair of bifurcated branches forming a rectangle disposed along the axis of the first waveguide. The two waveguides are cast as a single-piece. A scaler ring mounted around the circular waveguide is adjustable in position along the waveguide to improve performance, the set off of the leading edge of the scaler ring from the open end of the waveguide being a function of the focal length to diameter ratio of the disk at the focus of which the feedhorn is installed.
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