Dual mode feed horn

Details Dual mode feed horn Dual mode feed horn

1977-04-28

1978-10-24

Lieberman, Eli

Communications: radio wave antennas

Antennas

Wave guide type

333 21R, H01Q 1302

Patent

active

041224469

ABSTRACT:
A dual-mode feed horn for microwave antennas includes a multi-step microwave transformer having a series of abrupt steps with progressively increasing radial dimensions. At least certain of the steps have dimensions sufficiently large to convert TE.sub.11 mode energy passing therethrough to TM.sub.11 mode energy. The transformer is preferably a binomial transformer, and the axial length of the transformer is preferably about equal to the number of steps therein multiplied by 1/4 of the average wavelength of the microwave energy to be passed therethrough. A pair of waveguides are connected to opposite ends of the transformer for transmitting microwaves through the transformer, and the waveguide connected to the larger-diameter end of the transformer has an inside diameter at least as large as the maximum inside diameter of the transformer and a length sufficient to produce a predetermined phase relationship between the TE.sub.11 mode energy and the TM.sub.11 mode energy.

REFERENCES:
patent: 3413641 (1968-11-01), Turrin
patent: 3413642 (1968-11-01), Cook
patent: 3482252 (1969-12-01), Nagelberg
patent: 3530481 (1970-09-01), Tanaka et al.

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