Microwave antenna system having enhanced band width and reduced

Details Microwave antenna system having enhanced band width and reduced Microwave antenna system having enhanced band width and reduced

1980-12-29

1982-08-03

Moore, David K.

Communications: radio wave antennas

Antennas

Wave guide type

343840, 343DIG2, 343779, H01Q 1914

Patent

active

043430058

ABSTRACT:
The antenna system employs a parabolic reflector fed by an offset feed array of circular wave guides located substantially at the focus of the parabolic reflector, but offset from the axis thereof. A plurality of aperture tuning mechanisms disposed at the mouths of the circular waveguides of the waveguide feed array, and having physical lengths much shorter than one wavelength at the frequencies involved, are provided to reduce cross-polarization and mutual coupling between adjacent feeds. The short resonant length of these tuning mechanisms, and their shape which is chosen to generate the TM.sub.11 mode E-field contour line ensures that they are effective over a broad bandwidth of as much as 20% or more. Within this bandwidth, they act as inductive suppressors to control both cross-polarization and mutual coupling between adjacent feeds.

REFERENCES:
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patent: 4122446 (1978-10-01), Hansen

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