Millimeter-wave ultra-wideband log-periodic microstrip array antenna with frequency-selective surfaces

In this research paperwork, three ultra-wideband (UWB) millimeter wave (mmWave) 103 GHz log-periodic microstrip antenna arrays have been designed when antenna gain needed to be more significant in each model than in the previous one. The final model used frequency selective surfaces (FSSs) to increase the antenna gain. The simulation results of antenna design 1, which was designed with the CST MWS simulator, were compared with the simulation with an Ansys HFSS simulator, and the simulation results achieved from both simulators were in fair concurrence. In addition, the bandwidth (BW), total radiation efficiency, and peak gain obtained by simulation were > 54.3 GHz, 81.1%, and 21.43 dB. Additionally, a state-of-the-art error analysis simulation has been done to approximate the proposed future fabricated antenna’s gain and the BW because of the anticipated fabrication etching tolerance accuracy, the variation of the dielectric constant (ε_r) of the microstrip laminate, and the variation of the loss tangent (tan δ) of the microstrip laminate indicate the possible high-frequency losses, which are frequency-dependent. Therefore, these mmWave 103–150 GHz antennas may be used after experimental verification as a base beyond fifth-generation (B5G).