Abstract: A patch antenna array capable of simultaneously receiving signals polarized in orthogonal or opposite directions, i.e. vertical and horizontal or right-handed and left-handed circular directions, comprises an electrical signal outputting means for outputting electrical signals generated in response to the orthogonally polarized signals through two output feedlines, a plurality of lower patch antennas, a lower feedline with one end that connects to the electrical signal outputting means and the other end that branches out and connects to each of the lower patch antennas, a plurality of upper patch antennas capable of receiving signals with the orthogonal polarizations in relation to signals received by the lower patch antennae, and an upper feedline with one end that connects to the electrical signal outputting means and the other end that branches out and connects to each of the upper patch antennae.