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Open AccessArticle

A Circularly Polarized Antenna Array with Gain Enhancement for Long-Range UHF RFID Systems

1
School of Information and Communication Engineering, University of Electronics Science and Technology of China, Chengdu 611731, China
2
School of Electronic Science and Engineering, University of Electronics Science and Technology of China, Chengdu 611731, China
3
Department of Electrical and Computer Engineering, Dalhousie University, Halifax, NS B3H 4R2, Canada
4
College of Physics and Information Engineering, Fuzhou University, Fuzhou 350108, China
*
Authors to whom correspondence should be addressed.
Electronics 2019, 8(4), 400; https://doi.org/10.3390/electronics8040400
Received: 18 February 2019 / Revised: 29 March 2019 / Accepted: 29 March 2019 / Published: 3 April 2019
(This article belongs to the Special Issue Recent Advances in Array Antenna and Array Signal Processing)
A 2 × 2 circularly polarized (CP) sequential rotation microstrip patch antenna array with high gain for long-range ultra-high frequency (UHF) radio frequency identification (RFID) communication is proposed in this paper. In order to meet the operational frequency band requirement of 840–960 MHz and, at the same time, achieve enhanced broadside gain, a two-level sequential rotation structure is developed. Series power divider is used as the basic element of the feed network that is implemented with the substrate-integrated coaxial line technology for minimizing radiation losses. The manufactured prototype exhibits a peak gain of 12.5 dBic at 900 MHz and an axial ratio (AR) bandwidth (AR ≤ 3 dB) of 18.2% from 828 to 994 MHz. In comparison with the state-of-the-art, the proposed antenna shows an excellent gain/size trade-off. View Full-Text
Keywords: antenna arrays; high gain; circular polarization; sequential phase antenna arrays; high gain; circular polarization; sequential phase
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MDPI and ACS Style

Hu, W.; Wen, G.; Inserra, D.; Huang, Y.; Li, J.; Chen, Z. A Circularly Polarized Antenna Array with Gain Enhancement for Long-Range UHF RFID Systems. Electronics 2019, 8, 400. https://doi.org/10.3390/electronics8040400

AMA Style

Hu W, Wen G, Inserra D, Huang Y, Li J, Chen Z. A Circularly Polarized Antenna Array with Gain Enhancement for Long-Range UHF RFID Systems. Electronics. 2019; 8(4):400. https://doi.org/10.3390/electronics8040400

Chicago/Turabian Style

Hu, Wei; Wen, Guangjun; Inserra, Daniele; Huang, Yongjun; Li, Jian; Chen, Zhizhang 2019. "A Circularly Polarized Antenna Array with Gain Enhancement for Long-Range UHF RFID Systems" Electronics 8, no. 4: 400. https://doi.org/10.3390/electronics8040400

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