Communications: radio wave antennas – Antennas – Wave guide type
Patent
1978-01-27
1979-09-18
Moore, David K.
Communications: radio wave antennas
Antennas
Wave guide type
343772, H01Q 1300
Patent
active
041685040
ABSTRACT:
A prime focus multimode feed horn is used to illuminate a parabolic reflector such that the reflector-horn combination produces improved performance in the E-plane and H-plane of a principal aperture. A feed assembly which includes the multimode horn also has a hub assembly that is incorporated into the reflector with support structure, a boom, supporting interconnecting waveguides and the multimode dual frequency horn. Directly coupling the horn to the feed assembly is an orthomode generator connected to a receive waveguide and a transmit waveguide. The orthomode generator is assembled to a horn body waveguide that supports a horn aperture having a circular configured principal aperture surrounded by radially displaced circular rings forming concentric channels for modification of the E-plane receive pattern. Assembled into the horn aperture is an insert having opposed shoulders in the H-plane and opposed steps in the E-plane such that for an incoming plane wave the first zeros of the focal plane Bessel Function Distribution are coincident with the effective horn aperture. Also extending into the principal aperture in the H-plane are opposed matching buttons.
REFERENCES:
patent: 3831176 (1974-08-01), Epis et al.
patent: 3906508 (1975-09-01), Foldes
E-Systems Inc.
Moore David K.
Wilder Robert V.
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