A 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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Volume53, Issue12

December 2011

Pages 2821-2827

A CPW-fed annular slot-antenna with an L-shaped strip

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A CPW-fed annular slot-antenna with an L-shaped strip

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