A Dual-Band Circularly Polarized Antenna With a Dual-Band AMC Reflector for RFID Readers
- 12 March 2020
- journal article
- research article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Antennas and Wireless Propagation Letters
- Vol. 19 (5) , 796-800
Abstract
This letter proposes a circular patch antenna with dual band circular polarization (CP) at the UHF-RFID and WLAN bands. Two perpendicular slots are etched on the patch to down-shift the first resonance to 915MHz (UHF-RFID band) and introduce a new resonance at 2.45GHz (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 back lobe level and improve the gain at both bands. Measured 3dB AR bandwidths of 5.25% and 2% are achieved at UHF-RFID and WLAN bands respectively with gains of 3.1dBi (UHF-RFID) and 6.25dBi (WLAN). The antenna system can be used with RFID readers for detecting tags and sending information via the WLAN band.Keywords
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