An efficient electrically small planar loop antenna with capacitive feed is proposed for WiFi applications. The feeding element of our antenna is a printed T-shaped monopole, which is capacitively coupled to the radiating capacitively-loaded loop and good impedance matching is achieved through the capacitive coupling mechanism. Thus the capacitive feed leads to high radiation efficiency, gain and broad impedance bandwidth. The radiating element of the proposed antenna is comprised of a planar printed loop with an interdigital capacitor inserted on one side and a copper wall with height of 3 mm and thickness of 0.3 mm attached to the printed loop. The attached wall enables the antenna occupies more volume, which lowers its Q value and contributes to larger bandwidth. The proposed antenna exhibits a simulated −10 dB impedance bandwidth of 190 MHz from 2.39 GHz to 2.58 GHz, which is suitable for WiFi application.