부산대학교 도서관

This article presents a novel low-profile broadband polarizing reflector to convert dual linear polarization (LP) into dual circular polarization (CP). The polarizing cell is based on printed dipole technology and presents a wideband performance in Ka -band. The dimensions of the printed dipoles are adjusted cell by cell to improve the reflection phase performance against variations in the incidence angles or in the cell dimensions. A 25 cm flat polarizing reflector demonstrator has been designed, fabricated, and tested. The design has been optimized for transmit (19.2–20.2 GHz) and receive (29–30 GHz) frequencies in Ka -band, but the broadband behavior of the cell provides satisfactory results also at the intermediate frequencies. The measured patterns show a good agreement with the simulations, with an axial ratio lower than 1.8 dB within the 19.2–30 GHz band. The proposed polarizing reflector can be used for novel multibeam antenna configurations to produce multispot coverage in Ka -band with a smaller number of apertures.