In this work, a low-profile, omnidirectional right-handed circularly polarized patch antenna is proposed, having the ability to enable conical and omnidirectional patterns in the elevation plane and azimuth plane, respectively. The proposed structure is accomplished by loading an annular array of metallic vias inside a classic circular patch antenna that fed by a center-located probe. Additionally, the edges of circular patch and ground are both connected with curved parasitic strips, which are used for producing circular polarized waves in the xy- plane. The structure processes a profile of 0.029 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">λ₀</tex> , where <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">λ ₀</tex> is the wavelength at 5.85 GHz. The simulated results reveal that it has a narrow −10dB bandwidth of 2.3%, i.e., from 5.79 to 5.93 GHz, as well as an AR bandwidth from 5.83 to 5.9 GHz.
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Zhang et al. (2024) studied this question.
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