Theoretical and Empirical Study of Spatial Power Focusing Effect for Sparse Arrays at Terahertz Band

TL;DR

This paper combines theoretical analysis and experimental validation to study the spatial power focusing effect in large-scale sparse arrays at terahertz frequencies, providing insights into the factors influencing focusing and confirming the effect through measurements.

Contribution

It presents a closed-form expression for the power distribution along the z-axis and validates the focusing effect experimentally at 300 GHz.

Findings

Close agreement between measurements and theoretical simulations

Confirmation of the spatial power focusing effect for sparse arrays

Analysis of phase noise and positional deviations impact

Abstract

This work investigates the spatial power focusing effect for large-scale sparse arrays at terahertz (THz) band, combining theoretical analysis with experimental validation. Specifically, based on a Green's function channel model, we analyze the power distribution along the $z$-axis, deriving a closed-form expression to characterize the focusing effect. Furthermore, the factors influencing the focusing effect, including phase noise and positional deviations, are theoretically analyzed and numerically simulated. Finally, a 300 GHz measurement platform based on a vector network analyzer (VNA) is constructed for experimental validation. The measurement results demonstrate close consistence with theoretical simulation results, confirming the spatial power focusing effect for sparse arrays.