Abstract: According to the theory of Fabry Perot resonant cavity, a new type of double S low profile antenna is de signed and measuremented. The antenna adopts the method of loading metamaterial surface to reduce resonant distance of Fabry Perot antenna. Theoretical analysis shows that double S metamaterial superstrate exhibits negative phase characteristic at special frequency band. According to the Fabry Perot resonance condition, the profile of the antenna can be reduced. The results from measurement show that the resonant distance of the proposed antenna is reduced to姿/12. 7, which is far less than 姿/2 of the conventional antenna.