Design and Analysis of Dual-Reverse-Arrow Fractal Geometry Based Miniaturized Thin Strip Patch Antenna for Ultra-Wideband Applications
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Abstract
The military, radar and satellite systems require ultrawideband antennas. Microstrip patch antenna’s serve the purpose for such applications as they are low profile, occupies less volume and mechanically robust when applied on rigid surfaces. Fractals are space filling self similar structures where each sub part is the replica of the whole fractal. Fractal geometry when applied to microstrip patch antenna provides a good way to achieve the desired miniaturization and multiband properties. In this paper a miniaturized, wideband antenna based on novel fractal geometry is presented. The proposed design is a repeated S-fractal microstrip patch antenna. The simulation and optimization are performed using Ansoft HFSS. The results show that the proposed antenna shows multiple resonances at frequencies of 8.08GHz, 9.11GHz and 11.88GHz with the bandwidths of 240MHz, 745MHz, and 7.75GHz respectively. The maximum Gain of antenna at 11.88GHz is 9.25dB and the corresponding directivity is 9.88dB, thus making the antenna 93.62% efficient. To enhance the bandwidth of the antenna, the thickness of the substrate was increased. In order to have minimum reflections the terminal impedance of the antenna should match the characteristic impedance of the coaxial cable. The impedance matching was done by finding the best feed position parametrically, using HFSS.
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