In this paper, a high-gain multilayer 2×2 antenna array for the application of WLAN (wireless local area network) AP (access point) is presented. The antenna array consists of four square patch antenna elements fabricated on FR4 substrate. The FR4 substrate is with air gap to the ground plane. By adjusting the thickness of FR4 substrate and geometry of antenna array the maximum gain of array can be achieved. The proposed antenna is designed, fabricated and tested. The measured 10 dB return loss impedance bandwidth is around 14.2% (2.30 ~ 2.65 GHz). The gain of simulated and tested antenna array is about 13 dBi. The radiation efficiency for 2.4, 2.5 and 2.6 GHz are all larger than 65% at 2.4 GHz band. The 3dB beamwidth for .E-plane and ff-plane is about 30°. The test results of power gain and return loss are agreed with that of simulation.
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