Performance Evaluation of a Circularly Polarized Circular Loop Antenna Printed on GaAs, InP, and 4H-SIC Substrates in the Q/V band Frequencies

In this paper, the performance of an on-chip circularly polarized circular loop antenna has been evaluated using three various dielectric substrates in the Q/V band. To this end, Gallium Arsenide, GaAs, Indium Phosphide, InP, and Silicon Carbide, 4H-SIC, substrates are used with dielectric constants of 12.94, 12.4, and 6.52, respectively. The simulation results demonstrate impedance matching at 43 GHz, 44 GHz, and 45 GHz for 4H-SIC, GaAs, and InP, respectively. On the other hand, an axial ratio (AR) of less than 3 dB has been achieved in all cases with different bandwidths and frequency bands depending on the dielectric constant of each material. Moreover, the simulation results demonstrate a left-hand circularly polarized, LHCP, wave. Furthermore, the gain, radiation efficiency, and radiation pattern for the three configurations have been compared with each other. The antenna has been designed using Computer Simulation Technology (CST).