In this paper, the characteristics of a small antenna using an H-shaped microstrip patch antenna are analyzed. Operating frequency of H-shaped microsrip antenna is 2 GHz. The theoretical results are compared with experimental result using cavity model. Comparison with other reported results justify the veracity of the proposed method. Significant reduction of antenna size can be realized when the H-shaped patch is used instead of the conventional rectangular microstrip patch antenna. The designed antenna is simulated by using IE3D software. A comparison between the simulation and MATLAB result is shown. Good agreement with the experimental results is demonstrated.