CPW-Fed Slotted Hexagonal-Shaped Antenna with Circular Splits for Ultra Wideband Applications
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Abstract
This paper presents a coplanar waveguide-fed (CPW) slotted hexagonal-shaped antenna for ultra-wideband (UWB) applications. The proposed antenna consists of a radiating patch with a standard hexagonal shape. Fractal structures are etched into the hexagonal radiating patch to increase the impedance bandwidth. These fractal structures are formed by etching five different slots into the radiating element.The antenna is designed at 3 GHz on an RO4350B substrate, with a compact footprint of 0.388 λ0 ×0.364 λ0 × 0.015 λ0 at 2.98 GHz. A prototype was fabricated and tested to validate the simulation results. Measurements performed with a well-calibrated Agilent 8722ES vector network analyzer show that the proposed antenna achieves a −10 dB bandwidth covering 2.98 GHz to 11.8 GHz, corresponding to 119.35%. Radiation patterns measured in an anechoic chamber exhibit stable and well-defined characteristics across the band. Furthermore, the antenna demonstrates high efficiency and reasonable realized gain over the entire operating bandwidth. Hence, the proposed antenna is a suitable candidate for many modern UWB wireless systems.
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