Page 49 - ITU Journal Future and evolving technologies Volume 2 (2021), Issue 7 – Terahertz communications

ITU Journal on Future and Evolving Technologies, Volume 2 (2021), Issue 7

show that even in a heavy dust storm, transmittance [8] Meltem Civas, Turker Yilmaz, and Ozgur B Akan.
values are close to 0.9 in the low THz band when the “Terahertz Band Intersatellite Communication
altitude is 0, which is the worst case. When the altitude Links”. In: Next Generation Wireless Terahertz
is increased, transmit‑ tance values are higher than Communication Networks. CRC Press, pp. 337–354.
0.9 up to 1 THz. [9] Vineeth Venugopal. “The light way to go 6G”. In:
Photonics Focus 2.1 (2021), pp. 30–33.
5. CONCLUSION
[10] Oltjon Kodheli, Eva Lagunas, Nicola Maturo, Shree
THz space links can pave the way for services inclu- Krishna Sharma, Bhavani Shankar, JF Montoya, JC
ding live video feeding, high‑resolution imagery, and Duncan, Danilo Spano, Symeon Chatzinotas, Steven
virtual reality from space. Apart from its inherent Kisseleff, et al. “Satellite Communications in the
challenges such as molecular absorption loss, THz band New Space Era: A Survey and Future Challenges”.
communications pose other challenges due to In: arXiv preprint arXiv:2002.08811
developing THz source and antenna technologies. (2020).
Therefore, in this study, we discuss the major challenges [11] Meltem Civas, Oktay Cetinkaya, Murat Kuscu, and
of THz space links, namely molecular absorption loss, Ozgur B Akan. “Universal Transceivers: Opportu‑
spreading loss, and interference from RAS and EESS. The nities and Future Directions for the Internet of
possible solutions for ground/space links are locating Everything (IoE)”. In: arXiv preprint
ground stations to high and dry locations, and arXiv:2107.01028 (2021).
multiband antennas. Regarding spreading loss, large
[12] Kaushik Sengupta, Tadao Nagatsuma, and Daniel
aperture antennas can be used for ground stations
M Mittleman. “Terahertz integrated electronic and
bene iting from radio astronomy optics. Re lect‑arrays
hybrid electronic–photonic systems”. In: Nature
and UM‑MIMO are other solutions.
Electronics 1.12 (2018), pp. 622–635.
ACKNOWLEDGEMENT [13] NASA. Communications with Earth. URL:
https : / / mars . nasa . gov / mro /
This work was supported in part by Huawei Graduate mission /communications/.
Research Scholarship.
[14] Mohammad Ali Khalighi and Murat Uysal. “Survey
on free space optical communication: A commu‑
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