Design of ultra-wideband antenna with triple band-notched characteristics

A compact coplanar-waveguide-fed ultra-wideband antenna with triple band-notched characteristics is designed. The antenna uses rectangle patches as a radiation unit. By etching nested inverted U-shaped, circular arc shaped and S-shaped slots, band-notched function is achieved in the three subbands of 3.3-3.7 GHz for worldwide interoperability for microwave access(WiMAX), 5.150-5.825 GHz for wireless local area networks(WLAN) and 7.25-7.75 GHz for the downlink of X-band satellite communication systems. The result shows that the voltage standing wave ratio(VSWR) of the antenna in the band of 3.1-12.0 GHz is less than 2. The proposed antenna has a stable gain and almost omnidirectional radiation patterns.