Abstract
New microstrip antenna initiated from the portions of 1st order structures of Sierpinski square geometry is modeled in this paper as quasi-fractal device using an FR4 substrate of 4.4 dielectric constant, 1.6 mm thickness and 0.02 loss tangent. The intended microstrip antenna is designed for band frequencies of 3.5 and 7.8 GHz for WiMAX and metrological satellite applications with a bandwidth of 0.66 and 0.78 GHz for each band respectively. The designed antenna has considerable compact size that is smaller than many reported fractal and non-fractal antenna structures in the literature. Also, it has interesting return loss and radiation results that can be employed in diverse wireless devices. Measured input reflection coefficient, radiation patterns and gain results have been found in good agreement with those predicted by simulations.
Highlights
The accelerated development of wireless technologies has pioneered new demands for integrated components including microwave circuits like antennas
In this research article, a new quasi-fractal printed slot antenna has been mainly designed as dual-band device at 3.5 and 7.8 GHz center band frequencies for WiMAX and metrological satellite applications respectively
The antenna structure is based on the modified first order of Sierpinski fractal geometry
Summary
The accelerated development of wireless technologies has pioneered new demands for integrated components including microwave circuits like antennas. Fractal antennas can be remarkably miniature for applications requiring a fixed antenna or restricted in transparent materials to realize near-invisible larger-scale form factors [5] In this context, microstrip and printed fractal antennas have been investigated widely in the literature using a variety of the standard fractal curves and their iterations like Koch, Sierpinski, Minkowski and Hilbert fractal geometries [6,7,8]. There are some applicable limitations of fractal antennas including numerical constraints, low gain, fractal iterations and design complexity [16] These limitations can be solved by reformation techniques like fractal reconfiguration and like pre-fractal geometries [17,18]. The designed antenna has dual-band response at 3.5 and 7.8 GHz with reflection coefficients of -21 and -15 dB for each band respectively
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