High efficiency Ka-Band single layer air vias Reflectarray: Design and analysis

Design and analysis of a linearly polarized Ka-Band single layer Reflectarray (RA) based on the principle of dielectric perforation, are presented. The phase characteristics of a single layer unit cell is obtained by varying single air via diameter, located at the cell center. A 340 degrees reflected phase is realized. The resulted 29*29 air vias array design shows good performance in lowering Side Lobe Levels (SLL) and cross polarization while providing wider bandwidth and higher aperture efficiency. The proposed RA provides a 3-dB gain bandwidth of 17.3%, SLL of -23 dB, Half Power Beam width (HPBW) of 6.2 degrees, gain of 28.3 dBi (at 30 GHz), and a maximum aperture efficiency of 59 %. For comprehensive understanding, incident, total and scattered fields are analyzed in terms of amplitude and phase.