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

页码：542 / 545

页数：4