Feeds for compact ranges

Details Feeds for compact ranges Feeds for compact ranges

1986-09-18

1989-12-05

Hille, Rolf

Communications: radio wave antennas

Antennas

Wave guide type

343703, 343781R, H01Q 1300

Patent

active

048855936

ABSTRACT:
Circular open ended waveguide feeds for compact ranges. Feeds according to the present invention employ smaller apertures for a given frequency of operation than a standard compact range feed. According to a first embodiment of the invention, a circular open ended waveguide feed is constructed to operate with its lowest desired frequency of operation at approximately 1.01 times the cutoff frequency. A second embodiment includes a circular open-ended waveguide loaded with ridges to lower the cutoff frequency further and thus further reduce aperture size for a given bandwidth to radiate a broader beamwidth.

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