Abstract: An apparatus for broadening the radiation pattern of a waveguide horn includes an input waveguide feed including a non-circular waveguide horn having a non-circular aperture, and a dielectric lens shaped as a toroid having an interior opening and an outside circumference, the toroid being cut along an imaginary plane extending generally parallel to a diameter of the toroid and being positioned generally coaxially adjacent the non-circular aperture.

Abstract: An apparatus for broadening the radiation pattern of a waveguide horn includes an input waveguide feed including a non-circular waveguide horn having a non-circular aperture, and a dielectric lens shaped as a toroid having an interior opening and an outside circumference, the toroid being cut along an imaginary plane extending generally parallel to a diameter of the toroid and being positioned generally coaxially adjacent the non-circular aperture.

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.

Abstract: A mode suppressor for use with circular waveguides which are over-sized to provide a low-loss transmission path for signals in the TE.sub.11 mode and which carry an electric field which is perpendicular to the longitudinal axis of the waveguide. The mode suppressor includes resistance cards located in planes which are generally parallel to the longitudinal axis of the circular waveguide and generally perpendicular to the electric field of the TE.sub.11 mode. Resistance cards are also contained in secondary waveguides which are coupled to the sidewalls of the circular waveguide. The resistance cards in the secondary waveguide lie in a plane parallel to the TE.sub.11 electric field and perpendicular to the longitudinal axis of the circular waveguide. The TM and TE.sub.on modes (where n is an integer of 1 or greater) are suppressed by the resistance cards lying parallel to the longitudinal axis. The TE.sub.21 and TE.sub.31 modes are suppressed by the resistance cards contained in the secondary waveguides.