Communications: radio wave antennas – Antennas – Wave guide type
Patent
1996-08-14
1998-08-11
Le, Hoanganh T.
Communications: radio wave antennas
Antennas
Wave guide type
343785, 333126, H01Q 1300
Patent
active
057933359
ABSTRACT:
A feed system for an antenna has a set of inner and outer coaxial waveguides which apply, respectively, both higher and lower frequency radiations to a common radiating aperture provided by a horn and shroud which envelops radiating apertures of the individual feed waveguides. Each of the feed waveguides carries signals having a bandwidth of an octave. Lower frequency radiation to be transmitted by the outer coaxial feed waveguide is applied thereto by a set of four waveguides of a launcher which launches a wave with a desired propagation mode into the outer feed waveguide. Each of the launch waveguides is initially a rectangular double-ridged waveguide for increase bandwidth. The ridging is reduced to a condition of no ridging in the outer feed waveguide by a transition to a single inner ridge which terminates in a tapered star-shaped combination ridge within the outer feed waveguide. Impedance matching rings are slidable within the space between the inner and outer surfaces of the coaxial waveguide for development of a desired standing wave ratio for accurate generation of a desired beam pattern. A dielectric rod is disposed in a forward end of the tube of the inner feed waveguide and protrudes therefrom into the horn for shaping a beam of the higher frequency radiation. A single common phase center is provided for all bands with radiation simultaneously at plural bands.
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Anderson Bryant Ford
Baird Joseph Mark
Deneris Charles Andrew
Fisher Friedrich J.
Gartside Paul Johann
Ho Tan
L-3 Communications Corporation
Le Hoanganh T.
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