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http://dx.doi.org/10.5762/KAIS.2012.13.5.2325

Planar Square-spiral Antenna using a strip conductor  

Yang, Doo-Yeong (Dept. of Telecommunication Engineering, Jeju National University)
Lee, Min-Soo (Dept. of Telecommunication Engineering, Daejin University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.13, no.5, 2012 , pp. 2325-2331 More about this Journal
Abstract
Planar square-spiral antenna using a strip conductor is proposed and analyzed for RFID system in UHF band operating from 860MHz to 960MHz. By varying the length of common line, detached distance, strip line-space, strip line-width and the number of spiral turn, the optimized antenna are designed and fabricated in compact size without a matching-stub between the input port of the proposed antenna and RFID tag chip. From the optimized results, the frequency bandwidth in VSWR<2 has covered 100MHz in the RFID UHF band. The antenna gain has obtained 3.5dBi at the center frequency of 910MHz and the desired beam pattern has shown directional pattern on elevation and azimuth angle. Therefore, the proposed antenna is suitable for practical RFID applications requiring various tag chips with the specific input impedance.
Keywords
Planar square-spiral antenna; strip conductor; RFID tag; UHF band;
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