ABSTRACT
In this paper, a band notched ultra-wideband (UWB) patch antenna is presented with its circuit modelling. The rectangular patch antenna is designed on dielectric substrate and fed with 50 Ω microstrip by optimizing the width of partial ground, the width of the feed line to operate in UWB. This antenna consists of a radiating element with a strip, and a partial ground plane and feeding line has been demonstrated. With the design, the return loss is lower than 10 dB in 3.1-10.6 GHz frequency range and show the band-notch characteristic in the UWB band to avoid interferences, which is caused by WLAN (5.15–5.825 GHz) and WIMAX (5.25–5.85 GHz) systems. In addition, band-notched filtering properties in the 5.15- 5.825 GHz are achieved by cutting a circular slot on the radiating patch. The antenna design is simulated on electromagnetic (EM) simulation software using FR-4 substrate with dielectric constant of 4.4 and thickness of 1.6 mm. The proposed antenna has a compact structure and the total size is 15×14.5 mm2. Simplified lumped element circuit model of band notched UWB patch antenna had been derived. The circuit model had been simulated in Serenade simulator and the S- parameters is compared with the obtained scattering parameter from simulating in EM simulator.
