The document describes the design of an inverted-pi antenna for wireless sensor network applications. It summarizes relevant literature on planar antennas and CPW-fed antennas. The objective is to design a simple planar antenna operating at 2.4GHz. A 26x32mm inverted-pi antenna is designed and simulated using IE3D software. The simulated results show a return loss of -22.5dB and gain of 1.4dBi at 2.4GHz. Fabricated antenna measurements match closely with simulations.