发明名称 |
Dielectrically loaded wide band feed |
摘要 |
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. |
申请公布号 |
AU4057697(A) |
申请公布日期 |
1998.03.06 |
申请号 |
AU19970040576 |
申请日期 |
1997.08.08 |
申请人 |
L-3 COMMUNICATIONS CORPORATION |
发明人 |
BRYANT FORD ANDERSON;MARK JOHNATHON YAMAMOTO;DOUGLAS HARRY ULMER |
分类号 |
H01P1/161;H01Q5/00;H01Q13/02;H01Q19/08 |
主分类号 |
H01P1/161 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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