Polarization means for generating circularly polarized electro-magnetic waves

A re-polarization means for the conversion of linearly polarized electro-magnetic waves into circularly polarized electro-magnetic waves upon employment of a device for linear polarization filtration and of a single-layer or multi-layer polarization conversion grid structure following the device for linear polarization and mounted in front of a radiation aperture and respectively consists of a plurality of conductors extending substantially parallel to each other in the form of straight lines, meander lines, line-rectangle combinations or the like, characterized in that the device for linear polarization filtration is a single-layer or multi-layer designed grid structure (1, 2) which precedes relative to the electro-magnetic waves the polarization conversion grid structure (3, 4, 5) in the direction toward the radiation aperture so that both grid structures are insulated from one another and are disposed so as to be above one another layer-by-layer in a substantially non-planar manner, and the grid structure layers forming the device for linear polarization filtration consists of straight-line conductors extending substantially parallel to each other and have a direction relative to the longitudinal direction of the conductors in the polarization conversion grid structure of 45.degree., and characterized in that, for a curved, non-planar lattice structure, the orientation of said straight lines for accomplishing linear polarization filtration and of said meander lines for accomplishing circularly polarization are shaped so that projection of them on one plane perpendicular to the primary radiation axis results in straight lines.