Frequency notched wide slot antenna for UWB/2.4 GHz WLAN applications

A compact frequencynotched microstrip slot antenna for ultra-wideband (UWB) /2.4 GHz-band wireless local areanetwork (WLAN) applications is proposed. The antenna is similar to a conventionalmicrostrip slot antenna; however, by introducing a cross wide slot and a meandered-slottedstub, both compact size and frequency notched function can be achieved. It has beenstudied both numerically and experi- mentally for its impedance bandwidth, surface currentdistribution, radiation patterns, and gain. As will be seen, an operation bandwidth ofover 4.61 ranging from 2.39 to 11.25 GHz for return loss lower than having a frequencynotched band ranging from 4.75 to 5.85 GHz has been achieved, and good radiationperformance over the entire frequency range has also been achieved.