Antena reflectarray polarizadora en banda K y Ka para satélites pequeños

This contribution describes a dual-band polarizing reflectarray antenna for small-satellite communications. The proposed antenna has been designed to convert the incident dual-linearly polarized field into dual-circular polarization in K and Ka bands, generating a high gain beam as well. The unit-cell is composed of two layers of metallization, where each layer has orthogonal groups of dipoles and is designed to independently operate at a different frequency. The polarization conversion process has been generalized to operate with non-stacked dual polarization elements, which allows to use a single dielectric layer per operating frequency. Simulated results of a 20 cm polarizing reflectarray antenna with a dual-layer configuration show a maximum gain larger than 30 dBi and an axial ratio below 1.5 dB at both design frequencies (19.7 and 29.5 GHz).