Analysis and Design of Stable-Performance Circularly-Polarized Antennas Based on Coupled Radiators for Smart Watches

物理 散热器(发动机冷却) 联轴节(管道) 声学 拓扑(电路) 光学 电气工程 工程类 机械工程
作者
Xiao Zhang,Qiyu Zeng,Zeng-Pei Zhong,Qiong-Sen Wu,Lei Zhu,Tao Yuan,Qinghua Jiang,Bo Mei
出处
期刊:IEEE Transactions on Antennas and Propagation [Institute of Electrical and Electronics Engineers]
卷期号:70 (7): 5312-5323 被引量:2
标识
DOI:10.1109/tap.2022.3146890
摘要

A singly fed circularly polarized (CP) antenna based on coupled radiator pair with stable CP performance is proposed for the accurate positioning of smart watches in this article. It is first demonstrated that two identical coupled monopoles sharing a finite ground can be equivalent as a second-order filter network consisting of composite J/K inverters. The coupled radiators will produce a pair of even and odd modes, whose resonant frequencies and bandwidths are determined by the coupling strength. After that, the characteristic mode analysis (CMA) is conducted to verify the circuit model, and it reveals that the even and odd modes are orthogonal to each other, which are candidates for CP radiation. In particular, the phase difference of the two modes is determined by the coupling coefficient, and it can be elaborately manipulated by properly changing the current distribution of characteristic modes through ground size, slot loading, and radiator length. At last, two antenna prototypes are designed, implemented, and measured to validate the working principle. Different from conventional CP antennas operating in degenerate modes, the proposed antennas are insensitive to perturbation segments and can maintain stable CP performance, which is highly demanded in smart watches under wearing conditions.
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