Abstract
In this paper, a dual-band microstrip bandpass filter is designed with stepped-impedance resonator technique employing Moore fractal geometry. There exist an inevitable requirement for the filters to be compact in size and structure for various communication applications. The space filling property of fractal helps to miniaturize the filter with an increase in the order of iteration. The filter is designed on a high-cost substrate of dielectric constant 10.2 and thickness 1.27 mm to operate for both Wi-Fi and Wi-Max applications. The performance of the filter is analyzed using EM simulation tool. Similarly, the filter design is performed on a low-cost substrate with dielectric constant 4.4 and thickness 1.6 mm. The simulation results of both the filters are analyzed and compared. The filter designed on high-cost substrate shows better dual pass-band response with greater selectivity as compared to the filter designed on a low-cost substrate.
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