Wideband Circularly Polarized Two-Element MIMO Antenna with Polarization Diversity

IF 0.3 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

IEICE Communications Express Pub Date : 2024-09-10 DOI:10.23919/comex.2024COL0021

Zin Mar Phyo;Takafumi Fujimoto;Chai-Eu Guan

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Abstract

This paper introduces a wideband MIMO (multiple input multiple output) antenna operating Sub 6 GHz 5G frequency band with circular polarization (CP). It comprises two identical printed monopole antennas (PMAs) with disconnected ground planes, spaced at $0:051 \lambda_{0}$ ( $\lambda_{0}$ is a free-space wavelength at lowest frequency). An inverted U-shaped parasitic element reduces the mutual coupling and improves the axial ratio (AR), while a substrate cavity reflector is installed to be completely CP antenna and increase the absolute gain in the boresight direction. The proposed antenna achieves a measured 10dB impedance and 3dB AR bandwidth of 46.58% (3.03 - 4.95 GHz) with a maximum gain of 5.39 dBic. Notably, polarization in the far-field can be switched between right-hand circular polarization (RHCP) and left-hand circular polarization (LHCP) by changing the exciting port. Experimental measurements validate the antenna's performance within the desirable frequency range.

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带极化分集的宽带圆极化双元MIMO天线

本文介绍了一种工作在Sub - 6ghz 5G圆极化（CP）频段的宽带MIMO（多输入多输出）天线。它由两个相同的印刷单极天线（pma）组成，它们具有断开的接平面，间隔为$0:051 \lambda_{0}$ （$\lambda_{0}$是最低频率的自由空间波长）。倒u型寄生元件减少了相互耦合，提高了轴向比（AR），同时安装基板腔反射器作为完全CP天线，增加了轴向的绝对增益。该天线的10dB阻抗测量值和3dB AR带宽为46.58% (3.03 - 4.95 GHz)，最大增益为5.39 dBic。值得注意的是，通过改变激发端口，远场偏振可以在右圆偏振（RHCP）和左圆偏振（LHCP）之间切换。实验测量验证了天线在理想频率范围内的性能。

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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来源期刊

IEICE Communications Express ENGINEERING, ELECTRICAL & ELECTRONIC-

自引率

33.30%

发文量

114