Abstract: In this paper, a novel low-profile Fabry-Perot cavity antenna is designed based on the Artificial Magnetic Conductor（AMC） which works at 7 GHz. A rectangular microstrip patch antenna with a metal ground plane is utilized as the primary feed source, and it is fed by a coaxial probe. A single-layer double-sided printed AMC surface is used as the partially reflective surface of the antenna. The proposed AMC surface consists of elements, each element is composed of three layers. The upper layer consists of a square patch and a square ring, and the lower layer consists of a diamond-shaped patch. By analyzing the influences of different structural parameters on the reflection characteristics of the AMC element, the reflection phase is fixed to-25°, so that the profile height of the cavity is reduced to about 9.2 mm（0.215λ, λ-the wavelength in free space at 7 GHz）. A prototype antenna has been fabricated and tested. The results show that the impedance bandwidth of the antenna(|S₁₁|＜-10 dB) is 14%（7 GHz～8.5 GHz）. And the gain of the antenna reaches up to 13.8 dBi, and the side lobe level is lower than-21.3 dB. The results indicate that the antenna exhibits good radiation performance with a low profile.