Design and Validation of the Phase-Compensated Long-Range Sub-THz VNA-Based Channel Sounder

This letter presents the first vector network analyzer based subterahertz (sub-THz) phase-compensated channel sounder at 220–330 GHz using radio-over-fiber techniques that could enable long-range phase-coherent measurements. The optical cable solution enables measurements sub-THz bands, since it can effectively minimize loss. also proposes a novel phase compensation scheme to stabilize variations introduced by fiber of its application in multichannel/antenna proposed is validated back-to-back under two conditions, i.e., with presence thermal changes and mechanical stress. variation effects system shown be over $400^\circ$ GHz, compared notation="LaTeX">$15^\circ$ 220–288 notation="LaTeX">$37^\circ$ 288–330 after compensation, respectively, demonstrating robustness effectiveness developed practice. system, which has dynamic range 106.7 dB, support measurement up 300 m (limited length our subject over-the-air signal transmission loss practical environment).