A High Gain Cavity-Backed Antenna Array Based on the SICL Structure for Q-Band Application

A new substrate integrated coaxial line (SICL) is proposed at 45 GHz for low loss and small size. The insertion loss of designed transmission line is less than 0.2 dB. Then, a high gain cavity-backed antenna array based on the SICL structure is proposed for Q-band applications. The antenna array consists of 1×4 cavity-backed patch antenna array, T-junction power divider based on SICL, and SICL to ground coplanar waveguide (GCPW) transition. The -10 dB impedance bandwidth is 11.44 GHz (25.42%). The gain is 15.8 dBi at 45 GHz.