This paper presents a novel wideband circularly polarized antenna that is fed by substrate‐integrated waveguide. Based on the design of placing a pair of chamfered semicircular patches above a slot, a ‐shaped radiator is introduced between the semicircular patches. Multiple resonance points are generated by the combination of the entire radiating structure and a dumbbell‐shaped slot, resulting in improved impedance bandwidth and axial ratio (AR) bandwidth. The proposed element exhibits a wide impedance bandwidth of 50.5% (24.5–41.1 GHz) and an AR bandwidth of 44.2% (25.1–39.3 GHz) with a 44.2% overlapped bandwidth. Then, a 4 × 4 antenna array adopting the sequential rotation technique is constructed. The measured results demonstrate that a 40.6% overlapped bandwidth and a peak gain of 19.1 dBic are achieved. The proposed antenna array shows excellent performance, making it a good candidate for applications in millimeter‐wave wireless communication systems.

中文翻译：

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用于毫米波应用的装有 π 形偶极子的宽带圆极化天线

本文提出了一种由基板集成波导馈电的新型宽带圆极化天线。基于在槽上方放置一对倒角半圆形贴片的设计，在半圆形贴片之间引入了“形”散热器。整个辐射结构和哑铃形槽的结合产生多个谐振点，从而提高了阻抗带宽和轴比（AR）带宽。所提出的元件具有 50.5% (24.5–41.1 GHz) 的宽阻抗带宽和 44.2% (25.1–39.3 GHz) 的 AR 带宽，以及 44.2% 的重叠带宽。然后，采用顺序旋转技术构建4×4天线阵列。测量结果表明，实现了 40.6% 的重叠带宽和 19.1 dBic 的峰值增益。所提出的天线阵列表现出优异的性能，使其成为毫米波无线通信系统应用的良好候选者。