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A compact circularly polarized (CP) conical‐beam antenna based on the reactive impedance substrate (RIS) is proposed in this work. This single‐fed antenna utilizes a small circular patch and six curved branches as primary radiators. For the miniaturization purpose, the RIS structure is used, and an overall volume of only 0.66λ × 0.66λ × 0.066λ with respect to 5 GHz is achieved. For experimental demonstration,...
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