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On the Design of Multi-layered Polygonal Helix Antennas  

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 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.17, no.3, 2006 , pp. 249-258 More about this Journal
Abstract
In this letter, we propose a novel printed helix antenna for RFID reader in UHF band. The printed strip line of the antenna is first wound up outside a polygonal shaped layer and then the winding continues on an inner layer to control the overall gain and the radiation pattern. In addition, the winding pitch angles on each layer have either negative or positive values resulting in the broad CP bandwidth. The detail structure of the antenna was optimized using Pareto genetic algorithm(GA), so as to obtain excellent performances for RFID reader antennas. The optimized two-layered polygonal helix was fabricated on the cardboard of a flexible substrate and the performances were measured and compared with the simulations. The fabricated antenna was made up of copper tape which can adhere to a flexible cardboard and had 21.4 % matching bandwidth, 31.9 % CP bandwidth, readable range of $5.5m^2$ with kr=3.2. Also based on the current distribution of the strip line of the antenna and sensitivity of the antenna bents points, we confirmed that the antenna has the quarter-wave transformer near the feed for the broad matching bandwidth and radiates the traveling wave for the broad CP bandwidth using the bent strip line.
Keywords
Broad Bandwidth; Broad CP Bandwidth; Novel Helix Structure; Pareto Algorithm;
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