Abstract
ABSTRACTA compact novel probe‐feed single‐layer annular ring, dual‐frequency circularly polarized (CP) microstrip antenna is assessed numerically and experimentally in this communication. The antenna characterizes a small frequency ratio with good impedance bandwidth. The dual band operations are realized using two circular patches with one annular ring slot and exact feed position. In addition, a cross shaped slot is placed in the patch to achieve circular polarization. The antenna geometry structure is simulated using a commercially available electromagnetic solver high frequency structural simulator. The simulated and measured results, costly match within the operating bandwidth. The experimental results depict a 10‐dB return loss bandwidth of 15 MHz (2.415–2.430 GHz) for the lower band and 15 MHz (2.895–2.910 GHz) for the upper band, respectively. The measured 3‐dB axial ratio bandwidth is 0.826% (2.410–2.430 GHz) for the lower band and 0.862% (2.880–2.905 GHz) for the upper band. The frequency ratio of the upper and lower band is 1.19. The overall antenna size is 0.363 λ0 × 0.363 λ0 × 0.013 λ0 at 2.42 GHz. Details of the obtained dual band CP performances are also presented and discussed. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2711–2719, 2014
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