Circularly Polarized Bidirectional S-Slot Antenna for Universal UHF-RFID Reader
Keywords:
Circular polarization (CP), RF Identification (RFID), Ultra high frequency (UHF), Reader antenna.Abstract
This paper presents a design of the universal reader antenna applied for the ultra-high frequency (UHF) - radio frequency identification (RFID) system with the operating frequency from 840 MHz to 960 MHz. The antenna structure consists of S-Slot to produce the circular polarization. The total size of the reader antenna is 120 mm ×120 mm fabricated on the FR4 substrate with the dielectric constant of 4.3 and
a thickness of 3.18 mm. From the measured results, it is shown that the proposed reader antenna radiates
a bidirectional pattern with the circular polarization, covering the operating frequency from 660 MHz to 1050 MHz with axial ratio bandwidth of 46%. The axial ratio and gain at the boresight direction are 1.03 -dB and 3.23 dBic, respectively at 900 MHz which is the center frequency of universal UHF RFID standard band.
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