Communications: radio wave antennas – Antennas – Wave guide type
Patent
1986-05-19
1988-07-19
Sikes, William L.
Communications: radio wave antennas
Antennas
Wave guide type
343772, 343778, H01Q 1302
Patent
active
047588420
ABSTRACT:
An array of horn antennas with non-uniform aperture sizes is disclosed wherein the individual horns phase track over a wide frequency band. The horn with the smallest aperture is considered the reference horn, and its length defines the overall horn length of the other horn in the array. The flare lengths of the other horns of the array are less than the length of the reference horn, and lengths of waveguide are added to the other horns such that the respective combined flare lengths and waveguide lengths of each of the other horns equals the horn length of the reference horn. The respective lengths of the flare and the waveguide section are chosen such that the resultant horn antenna phase tracks the reference horn over the frequency band. Therefore, horn antennas of various aperture sizes, and restricted to a maximum length can be phase matched over a band of frequencies by reducing the flared length of each horn in relation to that of the smallest or reference horn, and making up the resulting length difference by a waveguide section.
REFERENCES:
patent: 2669658 (1954-02-01), Jackson
patent: 2720588 (1955-10-01), Jones
patent: 3045238 (1962-07-01), Cheston
patent: 3553692 (1971-01-01), Drabowitch
patent: 3555553 (1971-01-01), Boyns
The Sectoral Electromagnetic Horn, Barrow, W. L., Lewis, F. D., Proceeding of the Institute of Radio Engineers, vol. 27, No. 1, Jan. 1939.
Cohn, Seymour B., Flare Angle Changes in a Horn as a Mean of Pattern Control, Microwave Journal, 10/70, pp. 41-46.
Linhardt Wilbur J.
Patin Robert J.
Hughes Aircraft Company
Johnson Doris J.
Karambelas A. W.
Meltzer M. J.
Mitchell S. M.
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