Abstract
AbstractA slot‐ring with any type of asymmetry can support more than one mode. Based on this simple observation, a short coplanar waveguide (CPW)‐fed annular slot‐antenna backed by an L‐shaped strip is investigated in this article. On one hand, the annular slot‐ring with a backed L‐shaped strip and without the shorted stub is enough to generate a circularly polarized (CP) wave. On the other hand, the annular slot‐ring with a shorted stub and without the backed L‐shaped strip is enough to yield a broadband operation. In this article, we integrate both types of asymmetry in an annular slot‐ring. We can achieve 10 dB return loss bandwidth from 2.4 to 4.5 GHz. Within this wide band, a CP wave is observed at the 2.45 GHz band. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2821–2827, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26416
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