A Single-Layer Circularly Polarized Antenna With Improved Gain Based on Quarter-Mode Substrate Integrated Waveguide Cavities Array
A Single-Layer Circularly Polarized Antenna With Improved Gain Based on Quarter-Mode Substrate Integrated Waveguide Cavities Array
复制标题
基于四模衬底集成波导腔阵列的增益改进单层圆极化天线
DOI：
10.1109/lawp.2020.3033621
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发表时间：
2020-12
影响因子：
4.2
通讯作者：
Zaipin Nie
中科院分区：
文献类型：
--
作者：
Tianming Yang;Zhiqin Zhao;Deqiang Yang;Zaipin Nie
本文提出并实验验证了一种基于四分之一模基片集成波导（QMSIW）腔阵列的低剖面、高增益单层右旋圆极化（RHCP）天线。该天线由一个中心微带贴片和四个相同尺寸的QMSIW腔体组成，这些腔体直接级联到中心贴片。所提出的结构的电场分布类似于一个圆形SIW腔工作在高阶TM120模式。由于辐射边缘的边缘电场形成的同相等效磁流阵列，获得了高的RHCP增益和很低的宽边交叉极化。由于高阶工作机制，天线可以直接由同轴探针馈电，而不需要复杂的配电网络。在中心频率点5.78 GHz处，天线的实测RHCP增益高达10.4 dBi，与仿真结果吻合良好。
In this letter, a single-layer right-hand circularly polarized (RHCP) antenna with low-profile and improved gain based on quarter-mode substrate integrated waveguide (QMSIW) cavities array is proposed and experimentally validated. The proposed antenna consists of a central microstrip patch and four QMSIW cavities with the same dimensions, which are directly cascaded to the central patch. The E-field distribution of the proposed structure is similar to that of a circular SIW cavity working in the high-order TM120 mode. Due to the in-phase equivalent magnetic currents array formed by the fringing electric field of the radiation edges, a high RHCP gain with very low cross polarization in the broadside is achieved. Because of the high-order working mechanism, the antenna can be fed by a coaxial probe directly without any complex power distribution network. Measured RHCP gain of the antenna is up to 10.4 dBi at the center frequency point 5.78 GHz, which is in good agreement with the simulated results.
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