Transmission type polarization converter

The embodiment of the invention provides a transmission type polarization converter which comprises a plurality of unit structures, any unit structure comprises a first dielectric material plate, a first metal patch is arranged on a first surface in the thickness direction, and a second surface in the thickness direction is connected with a second dielectric material plate; the third surface of the second dielectric material plate along the thickness direction is connected with the second surface of the first dielectric material plate, and the fourth surface of the second dielectric material plate along the thickness direction is provided with a second metal patch; wherein a circular metal patch is arranged between the second surface of the first dielectric material plate and the third surface of the second dielectric material plate. The transmission-type polarization converter can convert incident electromagnetic waves into circularly polarized waves, thereby realizing polarization conversion of converting t