Importance

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Abstract

A wave guide of an antenna feed assembly has a wave polarization rotary section comprising a plurality of closely spaced conductive pins extending across the diameter of the wave guide. A first group of such pins adjacent the output end of the wave guide to an amplifier are stationary while a second plurality of pins are rotatable about the axis of the feed in progressive steps through each pin to 45.degree. positions selectively to one or the other side of the plane formed by the stationary pins to rotate one or the other of the 90.degree. polarized waves 45.degree. into the plane of the stationary pins and thence to the amplifier. The movable pins are received in a collar rotated by a conventional motor, the pins being located in slots of varying lengths in the collar so that each rotatable pin lies at the same angle to both of its adjacent pins. A ridge plate is employed in the wave guide to coaxial connector transition to provide a ridge loaded wave guide transition section; the ridge plate extending from a wall of the circular wave guide to the center conductor of the coaxial connector with the point of contact being located such with respect for the end wall of the wave guide to provide a resonant circuit at the frequencies under consideration. A matching boss located at the contact of the ridge plate and the center conductor is employed to add capacitance and assist in providing broad band tuning.

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First Claim