In this letter, a single-fed high-gain circularly polarized slotted patch antenna is proposed. The proposed antenna consists of a slotted radiation patch and a ground plate, which has a simple structure. The slots are etched on the radiation patch to radiate circular polarization. The measured impedance bandwidth for S11<−10 dB is around 17.4% (3.05–3.63 GHz). Also, the measured axial-ratio (AR) bandwidth for AR < 3 dB is around 5.4% (3.25–3.43 GHz). Moreover, the measured peak gain is about 10.2 dB at 3.34 GHz. The measured curves of S11, AR, and gain are in good agreement with the simulation. The proposed slotted patch antenna can radiate left-hand circular polarization (LHCP) stably from 3.25 to 3.43 GHz. The volume of the fabricated antenna is 0.43λ0×0.43λ0×0.07λ0. λ0 is the operating wavelength at the lowest frequency (3.25 GHz) for radiating circular polarization.

中文翻译：

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一种高增益圆极化开槽贴片天线

在这封信中，提出了一种单馈高增益圆极化开槽贴片天线。所提出的天线由开槽辐射贴片和接地板组成，结构简单。在辐射贴片上蚀刻槽以辐射圆极化。S11<-10 dB 的测量阻抗带宽约为 17.4% (3.05–3.63 GHz)。此外，AR < 3 dB 的测量轴向比 (AR) 带宽约为 5.4% (3.25–3.43 GHz)。此外，在 3.34 GHz 处测得的峰值增益约为 10.2 dB。S11、AR 和增益的测量曲线与模拟非常吻合。所提出的开槽贴片天线可以从 3.25 到 3.43 GHz 稳定地辐射左手圆极化 (LHCP)。制作的天线体积为0.43λ0×0.43λ0×0.07λ0。λ0 是最低频率 (3.