A wireless communication apparatus and a planar antenna thereof are provided. The wireless communication apparatus comprises a connecting port, a printed circuit board, and a planar antenna. The printed circuit board is connected to the connecting port, and the planar antenna is formed on the printed circuit board. The planar antenna comprises a radiation portion, a shorting portion, and a feeding portion. The feeding portion is connected to the radiation portion and the shorting portion, and the radiation portion and the shorting portion are in a bent shape so that the radiation portion, the shorting portion and the feeding portion are distributed in a rectangular region.