In the dual-polarized antenna according to at least one embodiment of the present disclosure, the straight line connecting first point P1 and second point P2 on the radiation plate 50 and the straight line connecting third point P3 and fourth point P4 on the radiation plate 50 are orthogonal to each other. Therefore, a polarized wave (45 polarization) may be radiated in the direction of the straight line connecting first point P1 and second point P2, and the other polarized wave (?45 polarization) may be radiated in the direction of the straight line connecting third point P3 and fourth point P4.

A distance L between first point P1 and second point P2 and distance L between third point P3 and fourth point P4 depend on a center frequency wavelength λg of the frequency band currently in use, but they may vary depending on the desired characteristics and material. For example, distance L may vary depending on the degree of separation between cross polarized waves or degree of inter-polarization isolation, the halfpower beamwidth, and the dielectric constant of the material of the radiation plate 50.