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Design of Thin Frequency Selective Surface Superstrates for Dual-Band Directivity Enhancement  

Lee Dong-Hyun (Department of Electronic and Electrical Engineering, Pohang University of Science and Technology)
Lee Young-Ju (Mobile Communication Division, Samsung Electronics)
Yeo Jun-Ho (Telemetics USA Research Division, ETRI)
Mittra Raj (Department of Electronic and Electrical Engineering, Pennsylvania State University)
Park Wee-Sang (Department of Electronic and Electrical Engineering, Pohang University of Science and Technology)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.17, no.7, 2006 , pp. 648-658 More about this Journal
Abstract
We propose a thin frequency selective surface(FSS) superstrate etched on a substrate for dual-band directivity enhancement, and present a design method of the superstrate. In the proposed new design, two FSS arrays with the same periodicity, but with different alignments are placed above and below a thin dielectric layer to overcome the problem of conventional superstrates for dual band directivity enhancements. Based on the unit-cell simulation, several important parameters that characterize the thin FSS superstrate are investigated, and the procedure for designing such a superstrate is described. We compare the resonant frequencies and the qualify factors of the unit cell with those of three FSS antenna composites with different quality factors, and identify the quality factors which support similar directivity enhancement at the dual-band directivity enhancement. It was found that there is an optimum FSS array size of a superstrate to enhance the directivity most efficiently. Measured results for a fabricated superstrate show a good agreement with the simulated ones.
Keywords
Frequency Selective Surface(FSS); Directivity Enhancement; Dual-Band; Patch Antenna;
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