A design of slot antenna loaded with circuit components is presented in this paper. The antenna is accommodated at the edge of the printed circuit board and loaded with circuit components. Using the folded slot and loaded with circuit components can miniaturize the antenna area. The slot antenna is deposed into several sub-networks, and the corresponding equivalent circuit is presented. The design equation can be acquired from the equivalent circuit by using the resonant condition. The antenna is operated for both Bluetooth and WLAN applications at 2.45 GHz. The design procedure of the antenna will be described in details. The experimental results of the antenna are shown for validation.