Abstract
A hybrid fractal antenna inspired from sri yantra geometry covering multiple bands in the microwave frequency spectrum is presented in this paper with a reduced size of 45mm x 30mm x 1.6mm. The presented design aims at a multiband antenna with a polygon slots in- scribed in a circular patch with defected ground structure and the effect of Sri Yantra fractal iterations on the antenna characteristics are also studied. The gains achieved at respective bands for Sri Yantra geometry are 4.61dB at 4.04GHz, 2.71dB at 4.94GHz, 4.77dB at 5.88GHz, 3.41dB at 6.60GHz, 5.12dB at 7.24GHz, 3.11dB at 8.88GHz and 3.47dB at 10.92GHz.
Highlights
The present day mobile technology facilitates universal wireless communication access to citizens worldwide with ever evolving features
Ultra wide band (UWB) systems used for short range communications with stable gain
Mobile communication system operate at various frequency bands requires a multiband antenna
Summary
The present day mobile technology facilitates universal wireless communication access to citizens worldwide with ever evolving features. In [1], by introducing the circular and hexagonal ring slots in the bow tie antenna design , the wide band antenna characteristics has been altered to multiple resonances at 2.4GHz,3.5GHz and 5.3GHz. Fractal shapes implementation on planar antenna geometries for multiband applications is a well perceived notion. A novel implementation of right angled Koch fractal shapes on the edges of a end fed square patch has resulted in six resonances ranging from 4.3 GHz to 9.2 GHz [2]. An edge fed Sri Yantra circular fractal antenna is presented with iterative rectangular slots in ground. This proposed antenna results multi resonances with good impedance matching and sufficient gains achieved.
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