Abstract
ABSTRACTA microstrip‐fed UWB slot antenna with wide axial ratio is presented in this letter. The proposed antenna design comprises of an asymmetrical slot excited by an asymmetrical feed. The introduced asymmetrical nature alters the magnitude and phase of orthogonal E‐field components of the resonant modes generated. The asymmetry across the slot arms improves the axial ratio bandwidth (ARBW). The mechanism of obtaining circular polarization is discussed in detail and the steps taken for the improvement of ARBW is presented. The measured results of the proposed antenna have a wide impedance bandwidth (S11 < −10 dB) from 2.5 GHz to 12 GHz with ARBW of 81.1% (3.2 GHZ to 7.6 GHz). The antenna possesses the features like compact size (40 mm × 40 mm × 1.58 mm), low cost (FR4 substrate, ɛr = 4.4, tan δ = 0.02) and have easy integrability. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1088–1093, 2016
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