A Dual-Band Circularly Polarized Antenna With a Dual-Band AMC Reflector for RFID Readers

被引：51
作者：
Sarkar, Sayan [1 ]
Gupta, Bhaskar [1 ]
机构：
[1] Jadavpur Univ, Dept Elect & Telecommun Engn, Kolkata 700032, India
来源：
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS | 2020年 / 19卷 / 05期
关键词：
Antennas; Dual band; Wireless LAN; Radiofrequency identification; Antenna measurements; Gain measurement; Gain; Artificial magnetic conductor (AMC); circular polarization; dual band; high impedance surfaces (HIS); UHF-RFID; WLAN;
D O I：
10.1109/LAWP.2020.2980325
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：
This letter proposes a circular patch antenna with dual-band circular polarization at the UHF-RFID and WLAN bands. Two perpendicular slots are etched on the patch to down-shift the first resonance to 915 MHz (UHF-RFID band) and introduce a new resonance at 2.45 GHz (WLAN band). Four slits are etched on the ground plane to improve axial ratio (AR) mainly in the first band. A dual-band AMC reflector having 25 unit cells is placed a small distance below the patch to reduce the backlobe level and improve the gain at both bands. Measured 3 dB AR bandwidths of 5.25% and 2% are achieved at UHF-RFID and WLAN bands respectively with gains of 3.1 dBi (UHF-RFID) and 6.25 dBi (WLAN). The antenna system can be used with RFID readers for detecting tags and sending information via the WLAN band.
引用
收藏
页码：796 / 800
页数：5
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