Compact wideband antenna with double-fed structure having band-notched characteristics

A compact ultra-wideband (UWB) printed planar antenna with double band-notched characteristic is presented. This antenna consists of a circular monopole and two W-shaped slots etched into the monopole and the truncated ground plane, which lead to the desired high attenuation at the two notch frequencies: WiMAX (3.4-3.8 GHz), WLAN (4.8-6.2 GHz). It is fed by a microstrip line with a double-fed structure and built on an FR-4 substrate with 20 × 30 mm surface area. The antenna is successfully simulated by CST, and measured to cover the bandwidth for UWB (3.0-10.8 GHz), which is obtained with promising performances, including stable radiation patterns and constant gain over its whole frequency band of interest.