Abstract:Microstrip antenna with a C-shaped slot is analyzed, and a multi-band microstrip antenna with C-shaped slot is designed. Numerical simulation is performed for the characteristics of the antenna with the software HFSS 10.0, which is a kind of simulation software based on Finite Element Mehod (FEM). The simulation results show that the C-shaped antenna's radiation character in the high frequency was separated. By changing the current path in the patch to improved the performance, the operation frequency channels of the improved antenna are 2.26~2.51, 3.38~3.60 and 4.19~4.48GHz, when return loss is less than -10dB, and the size of the microstrip antenna is reduced availably. Moreover, the antenna has a very well unitary radiation character and simple configuration. Therefore, this kind of antenna can be used in RF communication as a multi-band and compact microstrip antenna.