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Low-profile wide-beamwidth circularly-polarised patch antenna on a suspended substrate
Liu N.-W.; Zhu L.; Choi W.-W.
2016-06-05
Source PublicationIET Microwaves, Antennas and Propagation
ISSN17518733 17518725
Volume10Issue:8Pages:885-890
Abstract

A low-profile circularly-polarised (CP) patch antenna with wide axial-ratio (AR) beamwidth is proposed. Based on the transmission-line model, the radiation patterns of a CP patch antenna are calculated by modelling the entire patch as two pairs of equivalent parallel slots. Initially, the mechanism of wide-beamwidth CP radiation pattern is investigated. The results show that the |E| and |E| radiation patterns can be made nearly equalized over a large angular range, if the spacing L between two parallel slots is selected as 0.45 λ (Condition I). For a square patch, the length of each slot must be equal to the spacing L, and it needs to be maintained as one half wavelength at resonance for radiation (Condition II). By using a suspended dielectric substrate, the two above conditions is simultaneously satisfied, resulting to achieve a wide AR beamwidth. After that, the effect of the finite ground size on the 3-dB AR beamwidth is analysed to constitute a practical CP antenna. Finally, the proposed CP antenna is designed and fabricated. Experimental results are in good agreement with the simulated ones in terms of radiation beamwidth, reflection coefficient and AR bandwidth. Practically, the antenna achieves a wide 3-dB AR beamwidth of 120°.

DOI10.1049/iet-map.2016.0081
URLView the original
Indexed BySCI
WOS Research AreaEngineering ; Telecommunications
WOS SubjectEngineering, Electrical & Electronic ; Telecommunications
WOS IDWOS:000376760200010
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Citation statistics
Cited Times [WOS]:14   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionDEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
AffiliationUniversidade de Macau
Recommended Citation
GB/T 7714
Liu N.-W.,Zhu L.,Choi W.-W.. Low-profile wide-beamwidth circularly-polarised patch antenna on a suspended substrate[J]. IET Microwaves, Antennas and Propagation,2016,10(8):885-890.
APA Liu N.-W.,Zhu L.,&Choi W.-W..(2016).Low-profile wide-beamwidth circularly-polarised patch antenna on a suspended substrate.IET Microwaves, Antennas and Propagation,10(8),885-890.
MLA Liu N.-W.,et al."Low-profile wide-beamwidth circularly-polarised patch antenna on a suspended substrate".IET Microwaves, Antennas and Propagation 10.8(2016):885-890.
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