Abstract
The proposed RFID reader antenna progressed with perfect electric conductor (PEC) as the radiating element and FR 4 as the substrate to achieve circular polarization, enhancement in bandwidth, and read range. The design presents a CPW feed RFID antenna for near-field reading applications, between the range of 903 MHz to 929 MHz. The operating frequency of the proposed design is 900 MHz, axial ratio of the model is less than 3 dB, impedance bandwidth is 256 MHz, and axial bandwidth is 36 MHz, proving to be adequate for near-field RFID reader applications such as item-level tagging and smart shelf. The proposed antenna model is realized with fractal structure to achieve miniaturization. The developed antenna is optimized using EM software for numerical analysis. The designed antenna is fabricated, and the prototype is characterized in terms of dielectric constant and loss tangent. The obtained results indicate high correlation with simulation results.
Highlights
Monopole RFID antennas are widely applicable in the field of mobile applications and military, biomedical, and aerospace industries. e important property of monopole antenna selection is broad-band achievement. e performance of the antenna greatly depends upon the substrate parameters such as uniformity, dielectric constant, and loss tangent [1]
Extensive literature surveys were performed regarding the parameters stating that certain substrates produce an improvement in bandwidth performance [2,3,4,5,6,7,8]. Another survey reported that the material contains less values of loss tangent and dielectric constants and produces better result compared to higher values [9]
Design of the RFID Reader Antenna e proposed coplanar waveguide (CPW)-UHF-RFID reader antenna implemented with FR 4 as the substrate with an optimum thickness of 1.6 mm and medium dielectric constant of 4.3 to achieve circular polarization with good bandwidth performance at 900 MHz resonance frequency
Summary
Monopole RFID antennas are widely applicable in the field of mobile applications and military, biomedical, and aerospace industries. e important property of monopole antenna selection is broad-band achievement. e performance of the antenna greatly depends upon the substrate parameters such as uniformity, dielectric constant, and loss tangent [1]. Extensive literature surveys were performed regarding the parameters stating that certain substrates produce an improvement in bandwidth performance [2,3,4,5,6,7,8] Another survey reported that the material contains less values of loss tangent and dielectric constants and produces better result compared to higher values [9]. In the RFID domain, reader construction in the UHF band is widely used due to the long read range (1 m–10 m), and this is mostly applicable in container tracking, pallet tracking, parking lot access, and electronic toll fee collection [10,11,12,13,14,15,16]. Considering all these bands, the experiment selected an RFID range from 840 to 928 MHz
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