| 摘要 |
An antenna for elliptically polarized television transmission comprising, an elongated cylindrical waveguide having a multiplicity of slots spaced along the length and around the circumference of the waveguide for radiating horizontally polarized energy; a multiplicity of parasitic radiating dipoles mounted on the outer surface of the waveguide and spaced along the length and around the circumference of the waveguide for radiating vertically polarized energy, each of the dipoles being associated with one of the slots so that the combination of the horizontally and vertically polarized radiation produces elliptically polarized radiation; couplers for coupling electromagnetic energy from the interior of the waveguide to the slots; and a pair of coupling capacitors on opposite sides of each slot and connected to the radiating elements of the associated dipole for coupling electromagnetic energy from the field around the slot into the respective radiating elements.
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