Design of Wideband Reflectarray Antennas

The method providing bandwidth increasing of reflect array antennas is proposed. The main idea of this method is to compensate phase errors by means of the spatial separation of layers with reflective elements. A full-metal reflectarray antenna has been designed with the use of the proposed method, manufactured and tested. The 18% relative frequency band upon a criteria of 3dB gain reduction is achieved. The peak directivity is 27.7 dB. In addition, issues related to the excitation of slot-element self modes are considered. The excitation of these modes can significantly affect the characteristics of the reflectarray antennas.