The extended aperture method for the determination of the shadow region radiation of parabolic reflectors

Author

Kritikos, H.N.

Author_Institution

Univ. of Pennsylvania, Philadelphia, PA, USA

Volume

11

Issue

4

fYear

1963

fDate

7/1/1963 12:00:00 AM

Firstpage

400

Lastpage

404

Abstract

In this paper the problem of the shadow region radiation of reflectors with circular apertures is examined. The approach is based on an extension of the aperture method of calculating antenna patterns. Using this extended aperture method and assuming that the reflector is an absorbing screen, the shadow region pattern within small angles from the axis of the reflector is determined. These methods are applicable only to cases where the wavelength is small with respect to the dimensions of the reflector. The main conclusions are the following: the shadow region field is primarily dependent on the illuminating field which is present on the outer edges of the reflector. For a uniform illumination the front to back ratio is of the order of $[(2\\pi/\\lambda )\\rho]^{2}$ (where $\\lambda$ is the wavelength and $\\rho$ the radius of the aperture).

Keywords

Parabolic reflector antennas; Reflector antennas, parabolic; Antenna arrays; Antenna theory; Antennas and propagation; Apertures; Bridges; Impedance; Laboratories; Lighting; Relays; Zirconium;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.1963.1138060

Filename

1138060