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Design of Crooked Wire Antennas for UHF Band RFID Reader  

Choo Jae-Yul (School of Electronic and Electrical Engineering, Hongik University)
Choo Ho-Sung (School of Electronic and Electrical Engineering, Hongik University)
Park Ik-Mo (Department School of Electrical and Computer Engineering, Ajou University)
Oh Yi-Sok (School of Electronic and Electrical Engineering, Hongik University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.16, no.5, 2005 , pp. 472-481 More about this Journal
Abstract
This paper reports the design of RFID reader antennas working in UHF band. The reader antennas were designed using a Pareto Genetic Algorithm(Pareto GA). Antennas were optimized to have circular polarization(CP) with less than 3 dB axial ratio, impedance matching with less than VSWR=2 within the frequency range of UHF, an adequate readable range, a restricted size(kr<2.22) considering the practical condition. After Pareto GA optimization, we selected and built the most suitable antenna design and compared the measured results to the simulations. Operating principle of the antenna was explained by investigating the amplitude and the phase of the induced current on the antenna body. We also researched the stability of the antenna with respect to the manufacturing error and studied the critical design parameters by applying the random error method on the antenna bent points.
Keywords
Pareto Genetic Algorithm; Characteristics of Reader Antenna; Cost Functions;
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