This letter presents the design of a single point-fed, geometrically simple circularly polarized (CP) antenna for 28 GHz Ka-band applications. The proposed antenna is based on a straight microstrip line printed on one side and coupled with the nearly square patches through a 45° inclined V-shaped slot aperture on the other side. In order to generate circular polarization, the fundamental radiating mode is degenerated at a slightly different frequency by aligning the patch edges parallel to each arm of the V-slot with orthogonal arms. This configuration yields a relatively small size (10 mm × 27.7 mm), wideband, and high-gain right-hand CP antenna operating at 28 GHz. The impedance bandwidth of the proposed antenna is from 27.2 to 30.35 GHz and the 3 dB axial ratio (AR) bandwidth from 27.3 to 29.7 GHz with excellent directional characteristics in the broadside direction. The peak gain is approximately 11.65 dBic. The performance characteristics in terms of the impedance matching, AR, gain, and efficiency of the antenna for wearable applications are also investigated both numerically and experimentally. For practical applications, the small size of the structure allows for implementing the systems that consist of more than one antenna to account for user mobility.

中文翻译：

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适用于5G 28 GHz应用的系列倾斜槽式馈电圆极化天线

这封信介绍了用于28 GHz Ka频段应用的单点馈电，几何简单的圆极化（CP）天线的设计。所提出的天线是基于一条直线的微带线，该线印在一侧，并通过另一侧的45°倾斜V形缝隙孔与近乎正方形的贴片耦合。为了产生圆极化，通过将平行于V形槽的每个臂的贴片边缘与正交臂对准，以基本不同的频率使基本辐射模式退化。这种配置可产生相对较小的尺寸（10 mm×27.7 mm），宽带且工作在28 GHz的高增益右侧CP天线。拟议天线的阻抗带宽为27.2至30.35 GHz，3 dB轴向比率（AR）带宽为27.3至29。在宽边方向具有出色的方向特性的7 GHz。峰值增益约为11.65 dBic。还通过数值和实验研究了针对可穿戴应用的天线的阻抗匹配，AR，增益和效率方面的性能特征。对于实际应用，结构的小尺寸允许实现由多个天线组成的系统，以解决用户的移动性。