The double L shaped slot microstrip antenna is designed by using the magnetic material (JV 5) as substrate. Based on the magnetic material (JV 5) substrate, Double L shaped slot microstrip antenna is designed. The bandwidth is 2 times more than the normal substrate, size reduction of 40%. And then, the electromagnetic band gap (EBG) structure is introduced to design the microstrip antenna based on magnetic base plate EBG structure, the EBG structure uses the joint floor corrosion, namely the cycle H type and circular structures are corroded on the floor. Numerical simulation is performed with HFSS14.0. The results show that comparing with the microstrip antenna based on the non magnetic material substrate, the EBG structure of magnetic material has a prominent advantage of the miniaturization and high speed. The relative bandwidth is up to 10% but the gain is slight reduced. The introduction of the EBG structure can to some extent reduce the size of the antenna while increase the bandwidth of the antenna, and improve the gain and radiation characteristics.