Abstract
The general characteristics of helical aerials are summarized and the results of polar-diagram measurements in the S- and X-bands are given for single and multiple helices. Reference is made to methods of widening both the beam width and the bandwidth obtained with a helical aerial by means such as end loading and tapering.The possibility of adapting helical aerials to give wide-band linearly polarized arrays is explored experimentally with a considerable measure of success.Tests show that acceptable characteristics may be obtained with helices of ‘unorthodox’ form or with dimensions outside the limits suggested by Kraus.Encapsulation of helical aerials in foamed dielectric material in order to improve their rigidity is found to be a satisfactory and practical proposition provided that the materials are selected with some care, particularly in the X-band.
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