Abstract
In this paper, a new planar hexagonal shaped antenna with triple band rejections is presented. The hexagonal patch is designed on FR4-substrate, having circular cuts at its vertices and fed by $50 \Omega $ micro-strip triangular tapered feed line. This antenna with a partial ground plane and five half circular sleeves achieves a 26.15 GHz bandwidth (with return loss $\geq 10$ dB). Triple-frequency band rejections are achieved by adding an inverted E-shaped stub in addition to two triangular slots in the patch and square slot with a parasitic square inside. The proposed antenna is investigated using the high-frequency structure simulator (HFSS). The simulated scattering parameter S11 (Reflection Coefficient) results show three band rejections (1.66. – 3.29), (4.72 - 5.81) and (7.86 - 8.62) GHz to reject the unwanted interference from several applications as WiMAX and satellite communications. A small value of gain at the rejection bands with good radiation patterns in E-plane and H-plane are achieved.
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