In this paper, a S-shaped multi frequency antenna is designed. The S-shaped patch is obtained from conventional rectangular patch by using a rectangular slot. The antenna is excited by the use of simple probe feed. This antenna has a very simple and compact structure and thus is easy to be fabricated. The proposed antenna is operating at 1.7GHz, 3.1GHz, 4.15GHz and 4.9GHz. The design frequency of antenna is 2.05GHz. Zeland IE3D software is used for simulation of proposed design.