University of Oulu

J. Kokkoniemi, J. Lehtomäki and M. Juntti, "Simplified molecular absorption loss model for 275–400 gigahertz frequency band," 12th European Conference on Antennas and Propagation (EuCAP 2018), London, 2018, pp. 1-5. doi: 10.1049/cp.2018.0446

Simplified molecular absorption loss model for 275 – 400 gigahertz frequency band

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Author: Kokkoniemi, Joonas1; Lehtomäki, Janne1; Juntti, Markku1
Organizations: 1Centre for Wireless Communications (CWC), University of Oulu, P.O. Box 4500, 90014 Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.4 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2018
Publish Date: 2019-02-14


This paper focuses on giving a simplified molecular absorption loss model for a 275–400 GHz frequency band, which has significant potential for variety of future short and medium range communications. The band offers large theoretical data rates with reasonable path loss to theoretically allow even up to kilometer long link distances when sufficiently high gain antennas are used. The molecular absorption loss in the band requires a large number of parameters from spectroscopic databases, and, thus, the exact modeling of its propagation characteristics is demanding. In this paper, we provide a simple, yet accurate absorption model, which can be utilized to predict the absorption loss at the above frequency band. The model is valid at a regular atmospheric pressure, it depends on the distance, the relative humidity, and the frequency. The existing simplified model by ITU does not cover frequencies above 350 GHz and has more complexity than our proposed model. The molecular absorption loss increases exponentially with the distance, decreasing the utilizable bandwidth in the vicinity of the absorption lines. We provide a model to approximate the window widths at the above frequency band. This model depends on the distance, the relative humidity, the frequency, and the maximum tolerable loss. It is shown to be very accurate below one kilometer link distances.

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ISBN: 978-1-78561-816-1
ISBN Print: 978-1-78561-815-4
Article number: 8568124
DOI: 10.1049/cp.2018.0446
Host publication: 12th European Conference on Antennas and Propagation (EuCAP 2018)
Conference: European Conference on Antennas and Propagation
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This project (TERRANOVA) has received funding from Horizon 2020, European Union’s Framework Programme for Research and Innovation, under grant agreement No. 761794.
EU Grant Number: (761794) TERRANOVA - Terabit/s Wireless Connectivity by TeraHertz innovative technologies to deliver Optical Network Quality of Experience in Systems beyond 5G
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