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2012-09-29
Design and Analysis of a Novel CPW-Fed Koch Fractal Yagi-Uda Antenna with Small Electric Length
By
Progress In Electromagnetics Research C, Vol. 33, 67-79, 2012
Abstract
A novel Koch fractal printed Yagi-Uda antenna fed by coplanar waveguide (CPW) is proposed and analyzed. The antenna has first-order Koch fractal monopoles, and the monopoles' ground plane acts as the ground plane of the antenna. The radiation characteristics of the antenna are simulated by CST Microwave Studio® and explained by the simulated results. The antenna's currents distribution becomes more uniform after being fractal, which is conducive to increasing antenna's radiation directivity. The proposed Koch fractal Yagi-Uda antenna has an operating band of 885-913 MHz (relative bandwidth 3.1%) with the center frequency of 900 MHz. The total antenna size is 171 mm×85 mm (0.51λ×0.25λ) and the length in the antenna's polarization direction is only 25% of the wavelength corresponding to the center frequency. Compared to traditional Yagi-Uda antenna, the proposed antenna can achieve a 50% miniaturization effect.
Citation
Shu Lin, Xi Liu, and Xin-Ru Ma, "Design and Analysis of a Novel CPW-Fed Koch Fractal Yagi-Uda Antenna with Small Electric Length," Progress In Electromagnetics Research C, Vol. 33, 67-79, 2012.
doi:10.2528/PIERC12082707
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