International Journal of RF and Microwave Computer-Aided Engineering

RESEARCH ARTICLE

A single-feed circularly polarized loop antenna using characteristic mode analysis

Yongxin Chen

orcid.org/0000-0003-4281-9703

School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China

Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing, China

The Key Laboratory of Universal Wireless Communications Ministry of Education, Beijing, China

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Xiuping Li,

Corresponding Author

Xiuping Li

[email protected]

School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China

Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing, China

The Key Laboratory of Universal Wireless Communications Ministry of Education, Beijing, China

Correspondence

Xiuping Li, School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China.

Email: [email protected]

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Zihang Qi,

Zihang Qi

School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China

Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing, China

The Key Laboratory of Universal Wireless Communications Ministry of Education, Beijing, China

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Hua Zhu,

Hua Zhu

School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China

Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing, China

The Key Laboratory of Universal Wireless Communications Ministry of Education, Beijing, China

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Shizhe Zhao,

Shizhe Zhao

School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China

Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing, China

The Key Laboratory of Universal Wireless Communications Ministry of Education, Beijing, China

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Yongxin Chen,

Yongxin Chen

orcid.org/0000-0003-4281-9703

School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China

Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing, China

The Key Laboratory of Universal Wireless Communications Ministry of Education, Beijing, China

Search for more papers by this author

Xiuping Li,

Corresponding Author

Xiuping Li

[email protected]

School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China

Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing, China

The Key Laboratory of Universal Wireless Communications Ministry of Education, Beijing, China

Correspondence

Xiuping Li, School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China.

Email: [email protected]

Search for more papers by this author

Zihang Qi,

Zihang Qi

School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China

Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing, China

The Key Laboratory of Universal Wireless Communications Ministry of Education, Beijing, China

Search for more papers by this author

Hua Zhu,

Hua Zhu

School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China

Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing, China

The Key Laboratory of Universal Wireless Communications Ministry of Education, Beijing, China

Search for more papers by this author

Shizhe Zhao,

Shizhe Zhao

School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China

Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing, China

The Key Laboratory of Universal Wireless Communications Ministry of Education, Beijing, China

Search for more papers by this author

First published: 12 April 2021

https://doi.org/10.1002/mmce.22648

Citations: 8

Funding information: Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications; Key Laboratory of Universal Wireless Communications of Ministry of Education; National Natural Science Foundation of China

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Abstract

A novel method for a single-feed circularly polarized (CP) loop antenna with both broad impedance bandwidth and axial ratio (AR) bandwidth is presented based on characteristic mode analysis (CMA). The circular polarization characteristics are generated by exciting two orthogonal degenerate modes (DMs) via single feeding simultaneously. The 90^° phase difference is achieved by loading the lumped inductors or capacitors. The wide bandwidth characteristics are generated by splitting a pair of DMs. Consequently, the two overlapping resonance points are split. The positions of feeding and loadings are determined with the aid of CMA. Compared with conventional methods, the presented method can simplify the feeding structure and provided a compact antenna. Based on this method, a loop antenna with two inductors is demonstrated for circular polarization application. The measured results show an impedance bandwidth of 47% and 3 dB AR bandwidth of 8.3% at 2.4 GHz wireless local area network (WLAN) bands. Both the simulated and measured results agree well.

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