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The increasing demand of unoccupied and unregulated bandwidth for wireless communication systems will inevitably lead to the extension of operation frequencies toward the lower THz frequency range. Since atmospheric transmission windows exist in the lower THz frequency range, it can be realized that carrier frequencies of 300 GHz and beyond will be used for communications once the technology for high bitrate data transmission is available. However, the free-space path-loss and the attenuation due to molecules in the atmosphere can significantly reduce the transmittable data rate in the lower THz frequency range.The main factor affecting the behavior of terahertz band is the absorption by water vapor, which not only attenuates the transmitted signal, but also disperses the signal. A new model of the terahertz wave atmospheric propagation of attenuation and dispersion is developed by using the radiation transmission theory and the empirical continuum absorption based on the HITRAN database. Theoretical aspects of absorption are presented, emphasizing those that deserve special attention as frequency increases. The THz wave atmospheric attenuation experimental results and self- and foreign-continuum coefficients obtained with the improved THz-time domain spectroscopy (THz-TDS) technique are analyzed by this model. The intensities and locations of the observed absorption lines are in good agreement with spectral databases. This model accounts for the group velocity dispersion and the total path loss that a wave in the THz band suffers when propagating 1 km distance. The channel capacity of the THz band is investigated by this model under different conditions including antenna gains, channel bandwidth and transmitter power. In order to keep the considerations as general as possible, the derivations are based on simple assumptions and equations. The special requirement for antenna is also discussed.Three communication channels (340 GHz, 410 GHz and 667 GHz) are obtained in terms of the spectrum. The four parameters of the three channels, i.e., available bandwidth, center frequency, dispersion and transmittable data rate, are summarized and quantized. The signals through the atmosphere for the three communication channels within the corresponding atmospheric windows are not easy to broaden due to the low group velocity dispersion; high data rates of up to 10 Gbps or beyond per 1 GHz bandwidth can be transmitted via these channels if the antennas with high gains are used.
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Keywords:
- atmospheric propagation /
- terahertz time-domain spectroscopy /
- dispersion /
- channel capacity
[1] Cherry S 2004 IEEE Spectr. 41 58
[2] Huang K C, Wang Z 2011 IEEE Microw. Mag. 12 108
[3] Akyildiz I F, Jornet J M, Han C 2014 IEEE Microw. Mag. 21 130
[4] Akyildiz I F, Jornet J M, Han C 2014 Phys. Commun. 12 16
[5] Song H J, Nagatsuma T 2011 IEEE Trans. THz Sci. Technol. 1 256
[6] Inoue M, Hodono M, Oka M, Minamikata Y, Tsuji D, Fujita M, Nagatsuma T 2014 Asia-Pacific Microwave Conference Sendai, Japan, November 4-7, 2014 p1706
[7] Song H J, Kim J Y, Ajito K, Yaita M, Kukutsu N 2014 IEEE Trans. Microw. Theory Tech. 62 600
[8] Liebe H J 1989 Int. J. Infrared Millim. Waves 10 631
[9] Pardo J R, Cernicharo J, Serabyn E 2002 IEEE Trans. Antennas Propag. 49 1683
[10] Paine S https://www.cfa.harvard.edu/sma/memos/152.pdf [2014-3-3]
[11] Yang Y H, Mandehgar M, Grischkowsky D 2014 Opt. Express 22 4388
[12] Slocum D M, Slingerland E J, Giles R H, Goyette T M 2015 J. Quant. Spectrosc. Radiat. Transfer 159 69
[13] Wang Y W, Dong Z W, Li H Y, Zhou X, Deng H, Luo Z F 2015 J. Infrared Millim. Waves 34 557 (in Chinese) [王玉文, 董志伟, 李瀚宇, 周逊, 邓琥, 罗振飞 2015 红外与毫米波学报 34 557]
[14] Koshelev M A, Serov E A, Parshin V V, Tretyakov M Y 2011 J. Quant. Spectrosc. Radiat. Transfer 112 2704
[15] Rosenkranz P W 1998 Radio Sci. 33 919
[16] Agrawal G P 2002 Fiber-Optic Communication Systems (3rd Ed.) (New York: Wiley) pp38-47
[17] Schneider T 2015 J. Infrared, Millim. THz Waves 36 159
[18] Mottonen V S, Raisanen A V 2004 34th European Microwave Conference Amsterdam, Netherlands, October 12-14, 2004 p1145
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[1] Cherry S 2004 IEEE Spectr. 41 58
[2] Huang K C, Wang Z 2011 IEEE Microw. Mag. 12 108
[3] Akyildiz I F, Jornet J M, Han C 2014 IEEE Microw. Mag. 21 130
[4] Akyildiz I F, Jornet J M, Han C 2014 Phys. Commun. 12 16
[5] Song H J, Nagatsuma T 2011 IEEE Trans. THz Sci. Technol. 1 256
[6] Inoue M, Hodono M, Oka M, Minamikata Y, Tsuji D, Fujita M, Nagatsuma T 2014 Asia-Pacific Microwave Conference Sendai, Japan, November 4-7, 2014 p1706
[7] Song H J, Kim J Y, Ajito K, Yaita M, Kukutsu N 2014 IEEE Trans. Microw. Theory Tech. 62 600
[8] Liebe H J 1989 Int. J. Infrared Millim. Waves 10 631
[9] Pardo J R, Cernicharo J, Serabyn E 2002 IEEE Trans. Antennas Propag. 49 1683
[10] Paine S https://www.cfa.harvard.edu/sma/memos/152.pdf [2014-3-3]
[11] Yang Y H, Mandehgar M, Grischkowsky D 2014 Opt. Express 22 4388
[12] Slocum D M, Slingerland E J, Giles R H, Goyette T M 2015 J. Quant. Spectrosc. Radiat. Transfer 159 69
[13] Wang Y W, Dong Z W, Li H Y, Zhou X, Deng H, Luo Z F 2015 J. Infrared Millim. Waves 34 557 (in Chinese) [王玉文, 董志伟, 李瀚宇, 周逊, 邓琥, 罗振飞 2015 红外与毫米波学报 34 557]
[14] Koshelev M A, Serov E A, Parshin V V, Tretyakov M Y 2011 J. Quant. Spectrosc. Radiat. Transfer 112 2704
[15] Rosenkranz P W 1998 Radio Sci. 33 919
[16] Agrawal G P 2002 Fiber-Optic Communication Systems (3rd Ed.) (New York: Wiley) pp38-47
[17] Schneider T 2015 J. Infrared, Millim. THz Waves 36 159
[18] Mottonen V S, Raisanen A V 2004 34th European Microwave Conference Amsterdam, Netherlands, October 12-14, 2004 p1145
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