Communications: radio wave antennas – Antennas – Wave guide type
Patent
1979-12-26
1981-08-04
Moore, David K.
Communications: radio wave antennas
Antennas
Wave guide type
343 18A, 343872, H01Q 1300
Patent
active
042825300
ABSTRACT:
The present invention relates to a method for reducing the weather cover-induced reflection sidelobes associated with horn reflector antenna arrangements. More particularly, the present invention consists of attaching the weather cover (26) to curved forms (21,23) placed in the antenna aperture, where the forms are shaped to contour the weather cover into a cylindrical paraboloid form, this form being capable of focusing the reflections from the weather cover onto a line inside the antenna arrangement. By covering this line inside the antenna with microwave absorbing material, (36) the focused weather cover reflections may be absorbed, thereby significantly reducing the sidelobes caused by the presence of the weather cover.
REFERENCES:
patent: 3156917 (1964-11-01), Parmeggiani
patent: 3351947 (1967-11-01), Hart
patent: 3740755 (1973-06-01), Grenzeback
patent: 4086591 (1978-04-01), Siwiak et al.
Moeschlin, L. "Computer Analysis of Radomes," Twelfth Symposium on Electromagnetic Windows, Atlanta, Ga., Jun. 12-14, pp. 8-11.
James, J. R., et al., "Gain Enhancement of Microwave Antennas," Proceedings of the IEE, vol. 122, No. 12, Dec. 75, pp. 1353-1358.
Bell Telephone Laboratories Incorporated
Moore David K.
Pfeifle Erwin W.
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