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Rectangular microstrip antenna with annular slot for WLAN

In recent years, microstrip antenna has been the most interesting topic research in wireless telecommunication system. In this paper, we present a compact rectangular microstrip antenna with annular slot for wireless local area network (WLAN) application. We inserted an annular slot to increase the gain of the antenna and use proximity coupled as feed line to increase the bandwidth of the antenna. The microstrip antenna had been studied and designed using ansys HFSS for the verified of simulation result. The measured results show that the antenna can be designed to cover the resonant frequencies at 2.4 GHz and 5.8 GHz used for IEEE 802.11.a/b/g WLAN system.