Antenne spirales équiangulaires planes á quatre brins à réflecteur conique et à cavité, encastrée dans une structure (Plane equiangular 4-arm spiral antenna with conical reflector and cavity, fitted into a structure)

17 April 1975

journal article
Published by Institution of Engineering and Technology (IET) in Electronics Letters

Vol. 11 (8) , 169-170
https://doi.org/10.1049/el:19750129

Abstract

We present an experimental study of the radiation characteristics of a plane equiangular 4-arm spiral antenna with conical reflector and cylindrical cavity, fitted into a structure. When the spiral is on a level with the aperture of the cavity, the antenna is frequency independent. The bandwidth is greater than an octave (1 :2.66). When the spiral is included in the cavity, the antenna radiates as a circular aperture with equality of the E_θ and E_φ components over a 1 : 1.71 bandwidth and is no longer frequency independent. In all cases studied, the antenna possesses yery good symmetrical radiating patterns and circular polarisation.

Keywords

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