Ultrawide-band printed monopole antenna with dual notched bands for WiMAX and WLAN applications

A novel UWB printed monopole antenna with dual notched bands for WiMAX and WLAN applications is presented. The impedance bandwidth of 2.89GHz–12GHz with S11<−10dB is achieved based on the wideband property of the annular ring monopole. Two notched bands are created by embed inverted-U-slots in the tapered microstrip feed line for minimize the interference from other wireless communication systems operating in 3.3–3.6GHz and 5.15–5.825GHz bands. The more important point is that the two slots have weak mutual coupling to be tuned individually and randomly, and the notched frequencies can be easily designed to fit for the different wireless standards. Besides, the presented antenna has a very compact overall size of 20mm × 16mm, and stable gain and patterns are obtained during the design procedure.