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A Novel Low-Profile Circularly Polarized Diversity Patch Antenna with Extremely Small Spacing, Reduced Size, and Low Mutual Coupling
Neng-Wu Liu1; Lei Zhu2; Zhong-Xun Liu1; Mei Li3; Guang Fu1; Ying Liu1
2022-01
Source PublicationIEEE Transactions on Antennas and Propagation
ISSN0018-926X
Volume70Issue:1Pages:135-144
Abstract

A novel low-profile circularly polarized (CP) diversity patch antenna with extremely small edge-to-edge distance, reduced size, and low mutual coupling is proposed under dual modes. Initially, the single microstrip patch antenna (MPA) is theoretically investigated by using characteristic mode analysis. It demonstrates that a large number of radiative modes, i.e., CM1 to CM7, are excited for the traditional MPA. By selecting its quarter patch configuration with shorting pins, only a few modes, i.e., CM2 and CM7, could be resonated for the quarter patch antenna (QPA). Meanwhile, their nonbroadside radiated fields could be transformed into the broadside radiation. Particularly, the polarizations of CM2 and CM7 are maintained orthogonally with each other. Next, a linear slot is etched on the patch to reduce the magnitude ratio between |Eθ| and |Eφ| components. After that, the resonant frequency of CM7 is moved closely to that of CM2 for nearby 90° phase difference. With these arrangements, the compact CP performance is acquired by combining its CM2 and CM7. Furthermore, a pair of QPAs with CP diversity is deeply studied. The results prove that the antenna has successfully acquired both of left-handed CP (LHCP) and right-handed CP (RHCP) performances at dual ports. Moreover, the low mutual coupling between them is generated under extremely small spacing. In final, the proposed antenna is fabricated and tested. Both of LHCP and RHCP patterns are formed of around 4.785 GHz. Besides, the proposed antenna occupies the small overall volume 0.023λg3 (λ g is the guided wavelength), that is only half of the traditional patch (0.045λg3), and maintains the isolation as high as about 24 dB under extremely small distance (0.3 mm).

KeywordCharacteristic Mode Analysis (Cma) Circularly Polarized Diversity Compact Size Extremely Small Spacing Mutual Coupling Patch Antenna
DOI10.1109/TAP.2021.3111344
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaEngineering ; Telecommunications
WOS SubjectEngineering, Electrical & Electronic ; Telecommunications
WOS IDWOS:000742198500018
Scopus ID2-s2.0-85123595372
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Citation statistics
Cited Times [WOS]:1   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionDEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
Corresponding AuthorLei Zhu; Ying Liu
Affiliation1.National Key Laboratory of Antennas and Microwave Technology, Xidian University, Xi'an, 710071, China
2.Department of Electrical and Computer Engineering, Faculty of Science and Technology, University of Macau, Macao
3.School of Microelectronics and Communication Engineering, Chongqing University, Chongqing, 400044, China
Corresponding Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
Neng-Wu Liu,Lei Zhu,Zhong-Xun Liu,et al. A Novel Low-Profile Circularly Polarized Diversity Patch Antenna with Extremely Small Spacing, Reduced Size, and Low Mutual Coupling[J]. IEEE Transactions on Antennas and Propagation,2022,70(1):135-144.
APA Neng-Wu Liu,Lei Zhu,Zhong-Xun Liu,Mei Li,Guang Fu,&Ying Liu.(2022).A Novel Low-Profile Circularly Polarized Diversity Patch Antenna with Extremely Small Spacing, Reduced Size, and Low Mutual Coupling.IEEE Transactions on Antennas and Propagation,70(1),135-144.
MLA Neng-Wu Liu,et al."A Novel Low-Profile Circularly Polarized Diversity Patch Antenna with Extremely Small Spacing, Reduced Size, and Low Mutual Coupling".IEEE Transactions on Antennas and Propagation 70.1(2022):135-144.
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