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We have proposed and discussed a dual-spiral slot as a circularly polarized radiation element with a simple feeding system [1]. The dual-spiral slot located in the x-y plane, as shown in Fig. 1(a), has different radiation patterns in the x-z and y-z planes, due to its dual-element configuration. When the same radiation pattern is required in the x-z and y-z planes, the dual configuration is changed...
The loop antenna is well known as a fundamental element that radiates a linearly polarized wave. Recently, some unique properties have been discussed for a loop antenna capable of radiating a circularly polarized wave (CPW) [1]-[4]. CPW radiation is obtained using two perturbation elements on the loop.
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