Author
Abstract
In this paper, a printed antenna with circular slot is presented as a candidate for use in multiband wireless communication applications. The slot structure of the proposed antenna is with a circular slot structure. A smaller annular conducting ring with thickness w has been embedded in the slot structure. The slot structure together with the conducting ring has been etched on the ground plane of a substrate with relative dielectric constant of 4.4 and 1.6 mm thickness. A 50 Ω microstrip feed line has been printed on the reverse side of the substrate. Modeling and performance evaluation of the proposed antenna have been carried out using the commercially available EM simulator, HFSS from Ans of Corp. Simulation results show that the proposed antenna has a return loss response with four resonant bands. A parametric study shows that the antenna can cover most of the communication services below 6.0 GHz by varying the width of the inner conducting ring. The results also reveal that for the multi-band configurations studied, the ratios of the resonant frequencies (f2/f1) and (f3/f2) are with a considerable range. This shows flexibility in designing dual frequency antennas with the desired resonant frequencies. Furthermore, results show that the antenna has reasonable radiation characteristics and gain throughout the four resonating bands.
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