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A singly-fed circular patch antenna generates a circularly polarised conical beam with the help of two perturbation elements. The location of the feed point relative to the perturbation elements determines the rotational sense of the circularly polarised wave. Theoretical and experimental results for the radiation pattern and return loss are presented.<<ETX>>
A dual-frequency antenna consisting of a square microstrip patch with a rectangular notch is experimentally investigated. The resonant frequencies and return loss are shown as a function of the rectangular notch depth. The radiation patterns show that the polarisation planes at the first and second resonant frequencies are perpendicular to each other.<<ETX>>
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