Low-sidelobe reflector synthesis and design using resistive surfaces
Jenn, David C.
Rusch, Willard V.T.
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A procedure is presented for determining the resistivity of a paraboloid's reflecting surface to obtain a desired sidelobe level. The only requirement is that the normalized aperture distribution due to the feed be greater than the corresponding normalized low sidelobe distribution at every point on the reflector (i.e., the reflection coefficient on the surface greater than or equal to 1). In the synthesis procedure blockage is ignored and an ideal feed is assumed. In spite of this, computation of the secondary patterns of a resistvely corrected antenna including the feed using the method of moments show that a -40 dB sidelobe level is achievable. In principal there is no limit in the sidelobe reduction for the field scattered from the reflector. In practice, blockage, feed illumination errors in the surface resistivity and the feedback backlobe wil limit the sidelobe level.
IEEE AP-S, Vol. 39, No. 9, Sept. 1991 pp. 1372-1375The article of record as published may be located at http://dx.doi.org/10.1109/8.99046
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