Multimode, multi-step antenna feed horn

Details Multimode, multi-step antenna feed horn Multimode, multi-step antenna feed horn

1999-03-16

2000-12-19

Wong, Don

Communications: radio wave antennas

Antennas

Wave guide type

343756, H01Q 1900

Patent

active

061633046

ABSTRACT:
A multi-mode, multi-step feed horn (10) for a satellite antenna array that includes multiple transition steps (28-34) that provide control of the mode content of the signal, and the generation of substantially equal E-plane and H-plane beamwidths, with low cross-polarization and suppressed sidelobes. In one particular embodiment, two transition steps (32, 34) allow the E-plane to expand and generate the higher order TM.sub.11, propagation mode. The transition steps (32, 34) and a phase section (18) allow the mode content to be oriented relative to each other in the proper phase so that the useful bandwidth is on the order of 10%-15%. Two other transition steps (28, 30) provide impedance matching between a throat section (12) and the mode content transition steps (32, 34) to prevent or minimize reflections.

REFERENCES:
patent: 3568204 (1971-03-01), Blaisdell
patent: 4122446 (1978-10-01), Hansen
patent: 4972199 (1990-11-01), Raghavan
Thomas A. Milligan, "Modern Antenna Design," McGraw-Hill Book Company, pp. 200-205.
P. D. Potter, "A New Horn Antenna With Suprressed Sidelobes and Equal Beamwidths," Microwave J., vol. VI, pp. 71-78,Jun. 1963.

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