Circularly Polarized Stacked Annular-Ring Microstrip Antenna With Integrated Feeding Network for UHF RFID Readers

被引:88
作者
Chen, Xi [1 ]
Fu, Guang [1 ]
Gong, Shu-Xi [1 ]
Yan, Ya-Li [1 ]
Zhao, Wei [1 ]
机构
[1] Xidian Univ, Natl Key Lab Antenna & Microwave Technol, Xian 710071, Peoples R China
来源
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS | 2010年 / 9卷
关键词
Annular-ring; axial ratio (AR); circularly polarized (CP); feeding network; microstrip antenna;
D O I
10.1109/LAWP.2010.2051791
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A novel circularly polarized (CP) annular-ring microstrip antenna (ARMSA) is proposed for American ultrahigh frequency (UHF) radio frequency identification (RFID) readers. The annular ring is fed by an equal-split power divider with 90 degrees phase difference. For the compactness of the entire antenna, the divider with the shape of Archimedes gradual-change lines is designed at the inside of the annular ring. A circular parasitic patch is suspended above the ring to improve the impedance matching and bandwidth. It also enhances the performances of axial ratio (AR). The impedance bandwidth for S-11 < -10 dB and 3-dB AR bandwidth are 870-967 MHz (10.6% at 915 MHz) and 893-948 MHz (6%), respectively. The CP gain is 8.9 dBi at 915 MHz with the front-to-back ratio (F/B) of 16.5 dB. The proposed antenna is low profile as the total height is 0.043 lambda(0) (lambda(0) is the free-space wavelength).
引用
收藏
页码:542 / 545
页数:4
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