Frequency-Angle Two-Dimensional Reflection Coefficient Modeling Based on Terahertz Channel Measurement

TL;DR

This paper develops a new frequency-angle two-dimensional reflection coefficient model for THz channels based on extensive measurements, improving the accuracy of channel modeling by incorporating material-specific reflection properties.

Contribution

It introduces a modified Fresnel-based model using Lorenz and Drude models to better fit THz reflection data across frequencies and incident angles.

Findings

The model accurately fits measured reflection coefficients with low RMS error.

Reflection characteristics vary significantly with frequency and incident angle.

The model improves THz channel simulations for communication system design.

Abstract

Terahertz (THz) channel propagation characteristics are vital for the design, evaluation, and optimization for THz communication systems. Moreover, reflection plays a significant role in channel propagation. In this letter, the reflection coefficient of the THz channel is researched based on extensive measurement campaigns. Firstly, we set up the THz channel sounder from 220 to 320 GHz with the incident angle ranging from 10{\deg} to 80{\deg}. Based on the measured propagation loss, the reflection coefficients of five building materials, i.e., glass, tile, aluminium alloy, board, and plasterboard, are calculated separately for frequencies and incident angles. It is found that the lack of THz relative parameters leads to the Fresnel model of non-metallic materials can not fit the measured data well. Thus, we propose a frequency-angle two-dimensional reflection coefficient model by modifying the Fresnel model with the Lorenz and Drude model. The proposed model characterizes the frequency and incident angle for reflection coefficients and shows low root-mean-square error with the measured data. Generally, these results are useful for modeling THz channels.