Measurement of Rain Attenuation in Terahertz Wave Range

Ishii, Shigeyuki; Sayama, Shuji; Kamei, Takeshi

doi:10.4236/wet.2011.23017

Cited by 40 publications

(32 citation statements)

References 13 publications

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“…The rain attenuation curve in dB/km is linearly proportional to the rain rate in mm/hr. A recent single frequency 355 GHz measurement of rain attenuation vs rain rate gave an attenuation of approximately 4 dB/km for 5 mm/h with a great deal of data scatter [19]. As can be seen in Fig.…”

Section: Measurementsmentioning

confidence: 91%

Long-Path THz-TDS Atmospheric Measurements Between Buildings

Moon

Jeon

Grischkowsky

2015

IEEE Trans. THz Sci. Technol.

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We have measured THz pulse propagation through a 186 m distance for which the THz pulses propagated in the atmosphere between two buildings separated by 79.3 m, with different relative humidity (RH) and weather conditions such as clouds, rain, and snow. The THz pulses propagated through rain falling at 3.5 mm/h and snow falling at 2 cm/h equivalent to 2.0 mm/h rainfall. For calm weather, the transmitted THz pulseshapes and relative transit times were measured to a precision of 0.1 ps. These broadband measurements demonstrate the potential of line-of-sight THz communications, THz sensing, and THz imaging through fog and smoke.

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Section: Measurementsmentioning

confidence: 91%

Long-Path THz-TDS Atmospheric Measurements Between Buildings

Moon

Jeon

Grischkowsky

2015

IEEE Trans. THz Sci. Technol.

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“…There have been many investigations of THz attenuation based on different raindrop size distributions in outdoor rain conditions [21][22][23][24]. Several empirical raindrop size distributions have been presented such as exponential distribution, log-normal distribution, gamma distribution, and normalized gamma distribution.…”

mentioning

confidence: 99%

Comparison of Experimental and Theoretical Determined Terahertz Attenuation in Controlled Rain

Vorrius

Lamb

et al. 2015

J Infrared Milli Terahz Waves

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The effects of rain attenuation on 0.1-to 1-THz frequencies are reported in this paper. The THz pulses propagate through a rain chamber over a 4-m distance and are measured by THz time-domain spectroscopy (THz-TDS). A rain chamber is designed to generate controllable and reproducible rain conditions with different intensities. Image analysis software is employed to characterize the distribution of generated raindrop sizes. Theoretical THz power attenuations due to rain are calculated using Mie scattering theory and are compared with our measurements. Results show that both experimental and theoretical results are in very good agreement with each other.

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“…Rainfall is a significant impediment that obstructs the propagation of mm‐wave signals from transmitter to receiver. Millimeter‐wave signals can be absorbed, scattered, depolarized, and diffracted by rain . This can restrict the propagation of mm‐wave signals, causing high signal attenuation loss through the effective propagation path length (km) measured in dB/km.…”

Section: Introductionmentioning

confidence: 99%

“…Rain attenuation harshly increases when the frequency, rain density, or effective length are increased. This attenuation reduces the reliability, availability, and degraded the overall performance of the communications link . As a result, rain attenuation is a real and concerning issue facing the implementation of mm‐waves, especially in tropical regions with consistent heavy rainfall.…”

Section: Introductionmentioning

confidence: 99%

“…Several rain attenuation studies have been conducted to investigate the effect of rain on the propagation of mm‐wave bands in different environments while considering several scenarios. A number of these studies succeeded in conducting measurements . They gave indications about the behavior of mm‐wave band propagation during precipitation.…”

Section: Introductionmentioning

confidence: 99%

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Rain attenuation of millimetre wave above 10 GHz for terrestrial links in tropical regions

Shayea

Rahman

Azmi

et al. 2018

Trans Emerging Tel Tech

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Millimeter waves (mm‐waves) within frequency bands of 10 to 86 GHz will be used for both microwave and access link fifth‐generation (5G) systems. Thus, it is very important to investigate these bands to ensure reliability when 5G is applied in tropical regions like Malaysia in the coming few years. One of the major obstacles facing the propagation of mm‐waves in tropical regions is the rain attenuation. Rainfall results in the absorption, scattering, and diffraction of radio waves. This contributes to increased transmission losses and a reduction in the received signal levels. The effect is more severe in tropical regions that are characterized by intense heavy rainfall and large raindrop sizes. This paper provides a general overview on rain attenuation of mm‐wave bands. It highlights the nature of rain in tropical regions and its effects on the propagation of mm‐waves. It also reports the latest measurement studies focused on rain attenuation in mm‐wave frequency bands and the prediction methods used to estimate rain attenuation in mm‐waves. It contributes to the understanding of channel behavior and the characterization of mm‐wave bands during rainfall in tropical regions, especially in Malaysia. This study further strives to determine research gaps in this field as well as the future work and various propagation measurement systems that can be used to conduct real measurements and to develop prediction models for rain attenuation in mm‐waves for 5G systems. Furthermore, this paper analyzes the rain rate and rain attenuation on the basis of real measurement data conducted in Universiti Teknologi Malaysia at Skudai Campus, Malaysia. The analyzed results indicated that the rain attenuation at 38 GHz is critical and it can result in 18.4 dB/km as specific rain attenuation at 0.01% percentage of the time.

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Measurement of Rain Attenuation in Terahertz Wave Range

Cited by 40 publications

References 13 publications

Long-Path THz-TDS Atmospheric Measurements Between Buildings

Long-Path THz-TDS Atmospheric Measurements Between Buildings

Comparison of Experimental and Theoretical Determined Terahertz Attenuation in Controlled Rain

Rain attenuation of millimetre wave above 10 GHz for terrestrial links in tropical regions

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