A semi circular shaped UWB body area network antenna with C-band and WLAN band rejection

Abstract

An ultra-wide band (UWB) antenna with C-band and WLAN band rejection is proposed in this paper. The antenna is designed with a semicircular patch which is fed by a 50 ohm microstrip line. This antenna exhibits an ultra-wide band with 10dB return loss bandwidth from 2GHz to 10.3GHz. An inverted U-slot is incorporated to introduce a band notch from 5.1 GHz to 5.8GHz (WLAN) and two split ring resonators are placed at both sides of the feed line to add another band notch from 3.7 GHz to 4.2 GHz (C band for satellite downlink communication), which avoid interferences between these wireless communication bands from the UWB. The antenna is simulated and performances are investigated in terms of return loss and radiation patterns. The antenna performances are measured both in free space and on the body. The measured results are well agreed with the simulated results.