"A Measurement-Based Parameterization of Physics Reflection Models for Terahertz Communication: S21 raw data at 300-400 GHz"

"To support reflection coefficient modeling, we employ a VNA-based frequency-domain channel measurement system. Two laser alignment tools are used to ensure angle accuracy. The measurement radius is set to 40 cm to satisfy the far-field condition, and wave absorbers are placed to prevent interference with the received signal. The incident angle ranges from 10\u00b0 to 80\u00b0 with an angle step of 10\u00b0. The measurements are performed for the transverse electric (TE) mode. A total of ten test materials are tested at 300-400GHz. "