Asymmetric-Circular Shaped Slotted Microstrip Antennas for Circular Polarization and RFID Applications

被引：205
|
作者：
Nasimuddin [1 ]
Chen, Zhi Ning [1 ]
Qing, Xianming [1 ]
机构：
[1] Inst Infocomm Res, Singapore 138632, Singapore
来源：
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION | 2010年 / 58卷 / 12期
关键词：
Circular polarization (CP); circularly polarized antenna; microstrip antenna; radio frequency identification (RFID); slotted patch; UHF; DESIGN;
D O I：
10.1109/TAP.2010.2078476
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：
Novel asymmetric-circular shaped slotted microstrip patch antennas with slits are proposed for circularly polarized (CP) radiation and radio frequency identification (RFID) reader applications. A single-feed configuration based asymmetric-circular shaped slotted square microstrip patches are adopted to realize the compact circularly polarized microstrip antennas. The asymmetric-circular shaped slot(s) along the diagonal directions are embedded symmetrically onto a square microstrip patch for CP radiation and small antenna size. The CP radiation can be achieved by slightly asymmetric (unbalanced) patch along the diagonal directions by slot areas. Four symmetric-slits are also embedded symmetrically along the orthogonal directions of the asymmetric-circular shaped slotted patch to further reduce antenna size. The operating frequency of the antenna can be tuned by varying the slit length while keeping the CP radiation unchanged. The measured 3-dB axial-ratio (AR) bandwidth of around 6.0 MHz with 17.0 MHz impedance bandwidth is achieved for the antenna on a RO4003C substrate. The overall antenna size is 0.27 lambda(o) x 0.27 lambda(o) x 0.0137 lambda(o) at 900 MHz.
引用
收藏
页码：3821 / 3828
页数：8
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