Compact Series-fed Circularly-polarized Patch Array basedon Microstrip Line

Gengming Wei, Le Chang, Yu Wu
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Abstract

A compact single-layer circularly polarized (CP) antenna array is proposed in this paper for 5G/6G applications. The conventional microstrip line is modified as a feeding network by periodically and alternatively loading field blocking stubs, producing a linearly polarized in-phase radiative field aperture. By adding CP corner-truncated patches beside these in-phase fields, a linear high-gain CP antenna array excited by a single feed is obtained. The feasibility of the proposed design is demonstrated through the fabrication and measurement of a 16-element linear array. The results indicate that the 3 dB axial ratio bandwidth is 3.5% (19.60∼20.30 GHz), the -10 dB impedance bandwidth totally covers the 3 dB axial ratio bandwidth, and the peak realized gain is 14.9 dBi under an antenna length of 5.69λ0. This proposed strategy provides a very compact antenna structure to achieve high-gain CP radiation without the requirement of impedance transformers, phase shifters, and open-stop-band suppressing measures. Moreover, the antenna has a per-unit-length CP gain of 5.5/λ0, which is superior to many single-layer high-gain CPantennas.
基于微带线的紧凑型串联馈电圆极化贴片阵列
本文针对 5G/6G 应用提出了一种紧凑型单层圆极化(CP)天线阵列。通过周期性地交替加载场阻塞存根,将传统微带线修改为馈电网络,从而产生线性极化同相辐射场孔径。通过在这些同相场旁边添加 CP 角截断贴片,可获得由单个馈电激励的线性高增益 CP 天线阵列。通过制作和测量 16 元线性阵列,证明了所提设计的可行性。结果表明,3 dB 轴向比带宽为 3.5%(19.60∼20.30 GHz),-10 dB 阻抗带宽完全覆盖了 3 dB 轴向比带宽,在天线长度为 5.69λ0 的情况下,实现的峰值增益为 14.9 dBi。这一建议策略提供了一种非常紧凑的天线结构,无需阻抗变换器、移相器和开挡带抑制措施即可实现高增益 CP 辐射。此外,该天线的单位长度 CP 增益为 5.5/λ0,优于许多单层高增益 CP 天线。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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