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.