A CPW fed octagonal patch UWB antenna with WiMAX band-notched characteristics

In this paper, We present a rectangular shaped antenna containing octagonal metal patch which covers entire ultra-wide bandwidth (UWB) from 3.0-10.6 GHz for VSWR ≤ 2 except a stop band at 3.1-3.6 GHz.A CPW-fed hexagonal slot with an octagonal tuning stub radiates through a hexagonal aperture, which ensures UWB impedance matching. A pair of coupling strips inserted in the hexagonal slot, which creates, a band-rejected filter characteristic at the world wide Interoperability for Microwave Access (WiMAX) band. The return loss, VSWR, current distributions, and radiation patterns of the proposed antenna are presented. The antenna is determined using design equation, and simulated by Mentor graphics IE3D electromagnetic solver, which is based on the method of moments. The simulation results show that the proposed antenna gives bi-directional radiation pattern in the E-plane and omni-directional radiation pattern in the H-plane. The antenna gains are varies from 3 dBi to 5.5dBi over the entire UWB region excluding at notch bands.