A Low-Profile Broadband Circularly Polarized Patch Antenna Based on Characteristic Mode Analysis

被引：66
作者：
Gao, Xi [1 ]
Tian, Guowei [2 ]
Shou, Zhaoyu [2 ]
Li, Simin [1 ]
机构：
[1] Guangxi Univ Sci & Technol, Sch Elect & Informat Engn, Liuzhou 545006, Peoples R China
[2] Guilin Univ Elect Technol, Sch Informat & Commun, Guilin 541004, Peoples R China
来源：
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS | 2021年 / 20卷 / 02期
基金：
美国国家科学基金会;
关键词：
Broadband; characteristic mode; circular polarization; metasurface;
D O I：
10.1109/LAWP.2020.3044320
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A low-profile and broadband metasurface antenna is proposed for circular polarization radiation. The metasurface is an array of subwavelength square patches. Themodal behaviors of the proposed metasurface are investigated by using the characteristic mode theory. Two characteristic modes with the same resonant frequencies and orthogonal current distributions are chosen as operation modes. Furthermore, a hybrid feed system consisting of a cross-slot and a microstrip line is employed to excite the two orthogonal modes having a 90 degrees phase difference to obtain circular polarization radiation. Based on these concepts, an antenna with low profile of 0.07 lambda(0) (lambda(0) is the free-space wavelength at an operation frequency of 5.5GHz) is designed. The measurement results show that the proposed antenna has-10 dB impedance bandwidth of 4.8-6.35 GHz and 3 dB axial-ratio bandwidth of 4.85-6 GHz. Moreover, the antenna gain is 6.8-9.7 dBic in the whole axial-ratio bandwidth.
引用
收藏
页码：214 / 218
页数：5
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