Antenna for transmitting circularly polarized television signals
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United States of America Patent
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Mar 6, 1990
Grant Date -
N/A
app pub date -
Apr 1, 1988
filing date -
Apr 1, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An antenna for circularly polarized television transmission comprising, an elongated coaxial waveguide having inner and outer conductors, the outer conductor of the waveguide having a multiplicity of slots spaced along the length and around the circumference of the outer conductor for radiating horizontally polarized energy, a multiplicity of dipoles mounted on the outer surface of the outer conductor and spaced along the length and around the circumference of the outer conductor 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 circularly polarized radiation, and coupling means for coupling electromagnetic energy from the interior of the waveguide to the slots and the dipoles, the coupling means for both the slots and the dipoles picking up electromagnetic energy from the interior of the waveguide in a common transverse place.
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