Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Patent
1980-09-08
1982-08-03
Lieberman, Eli
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
343840, 343909, H01Q 1510, H01Q 1912
Patent
active
043430023
ABSTRACT:
An antenna system is disclosed comprising a paraboloidal reflector and a feed array having several substantially identical feed elements. The antenna produces a coverage pattern of transmitted radiation in the form of a shaped beam. The present invention permits the use of a smaller number of feed elements for a given size of the reflector's aperture by means of attenuating the sinusoidal ripple that is present in the shaped beam radiation pattern and caused by the size of the feed elements. A plurality of disks is placed in the focal plane of the paraboloidal reflector. The disks are selective with respect to one spatial frequency of the emitted radiation (which is at a constant electromagnetic frequency). The disks may be fabricated of a material which reflects the radiation, a material which absorbs the radiation, or a dielectric material of a certain thickness stipulated herein which changes the phase of the radiation by 90.degree.. By this technique, ripples are substantially removed from the beam pattern. The principles of the invention can be applied to antenna systems which are used to receive electromagnetic radiation.
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Ford Aerospace & Communications Corporation
Lieberman Eli
Radlo Edward J.
Sanborn Robert D.
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