Abstract
An L-shaped slot loaded inside a C-shaped slot is used to realize a dual-band antenna fed by a microstrip line. Two circularly polarized waves are generated at the 1.57 and the 2.45 GHz band. The width in the C-slot is uniform, whereas the width in the L-slot is nonuniform. In the L-slot, the width in the vertical part is made wider than that in the horizontal part. We found that the width in the vertical part of the L-slot is an efficient tuning parameter. The antenna can achieve about 6% axial ratio bandwidth at both bands. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1041–1044, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25928
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