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Journal of Infrared, Millimeter, and Terahertz Waves

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06-05-2024 | Research

Static Reflective Surfaces for Improved Terahertz Coverage

Authors: Thanh Le, Suresh Singh

Published in: Journal of Infrared, Millimeter, and Terahertz Waves | Issue 5-6/2024

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Abstract

LoS (Line of Sight) MIMO (Multiple Input Multiple Output) is considered the best way to deliver high-capacity channels for terahertz communications due to the severe attenuation suffered by reflected components. Unfortunately, terahertz links are easily blocked by any obstruction resulting in link breakage. Therefore, it is necessary to provide alternative paths via reflectors. A problem shared by LoS paths and reflected paths (via polished reflectors) is that the channel matrix is rank 1 in the far field. As a result, the achieved capacity is lower than what can theoretically be achieved in a rich multi-path environment. In this work, we simultaneously solve the channel rank problem and the coverage problem by using static reflective surfaces which provide limited scattering of the incident signal in a way that minimizes signal loss but provides multiple paths to the receiver with varying phase. We construct such a surface and characterize the received signal using a terahertz testbed. We show that using our surface, we can improve channel capacity for 2 × 2 LoS MIMO. We also develop a theoretical model for the received signal and show that the reflected capacity matches the measured capacity well.

previous article Hybrid Subterahertz Atmospheric Pressure Plasmatron for Plasma Chemical Applications

next article Experimental Delay Tests in Causal THz Channel Model

We use the terms reflective element and metal strip interchangeably in this paper.

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Title: Static Reflective Surfaces for Improved Terahertz Coverage
Authors: Thanh Le
Suresh Singh
Publication date: 06-05-2024
Publisher: Springer US
Published in: Journal of Infrared, Millimeter, and Terahertz Waves / Issue 5-6/2024
Print ISSN: 1866-6892
Electronic ISSN: 1866-6906
DOI: https://doi.org/10.1007/s10762-024-00985-y

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