An aperture coupled circularly polarized(CP) stacked patch antenna with low profile thickness was designed based on LTCC（low temperature co fired ceramic）technology. The proposed antenna was composed of the two layer stacked LTCC substrates. The fractal patch on the front of radiant substrate can reduce size and expand bandwidth of the antenna. A cross slot on the front of feed layer substrate was fed by Wilkinson power divider with 90° phase difference, which was used for phase shifting of the perpendicularity electric field and circularly polarized radiation.The profile thickness of the antenna was restricted in 3 mm. The simulated results showed that the impedance bandwidth of the antenna exceeded 60 MHz, the axial ratio was less than 1.5 dB and the gain approached 5 dB with the centre frequency of 1.268 GHz.