A compact microstrip line fed open-ended slot antenna with an inverted U-shaped stub in ground plane for application in WLAN systems

In the paper presented here, a microstrip-line fed open ended slot antenna is presented which is compact in size. This antenna has an inverted U-shaped stub rested with the help of two horizontal strips from the left and right inner sides of a rectangular slot cut in the ground plane. The dimension of the antenna is reasonably small i.e. (20×22 mm
²
). This antenna performs at two resonating frequencies i.e. at 2.38 GHz and 5.19 GHz and these two bands are operating for the 2.4/2.48 and 5.15/5.35 GHz wireless LAN application. The percentage bandwidths of both the resonance bands are 20.57 and 6.94 respectively. The gain varies in the range of 3 dBi to 3.2 dBi and 3.5 dBi to 3.6 dBi in the band of 2.38 GHz and 5.19 GHz respectively and these are enough for the operation in WLAN system. This proposed antenna shows a consistent co-polar as well as an allowable cross-polar i.e. the good radiation patterns for the desired bands of frequencies.