Effect of hydroscopic water on dielectric constant of dust at X-band

Ghobrial, S.I.

doi:10.1049/el:19800277

Cited by 22 publications

(11 citation statements)

References 1 publication

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“…Similar to the case of Ahmed, discrepancy was however noted in the loss tangent of clay. Measurements on samples collected in Khartoum were carried out by [20] using the conventional resonant cavity technique. The results showed a loss tangent of 0.039 which was larger than the Chu assumption.…”

Section: Permittivitymentioning

confidence: 99%

“…At this stage of development, it is obvious that sufficient interest was shown to knowledge of dielectric constants, and it was noted that the dielectric constant, though dependent on frequency, is not sensitive to frequency above 4 GHz [20,32]. At frequencies up to 18 GHz, [15] evaluated the MW dielectric behaviour of soil-water mixtures and presented a semi empirical mixing model based upon the index of refraction as a function of water content and soil textural composition.…”

Section: Permittivitymentioning

confidence: 99%

See 1 more Smart Citation

Review and Assessment of Electromagnetic Wave Propagation in Sand and Dust Storms at Microwave and Millimeter Wave Bands --- Part I

Musa¹,

Bashir²,

Abdalla³

2014

PIER M

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Abstract-Electromagnetic wave propagation in arid and semi-arid regions is influenced by sand and dust storms. Meagre information has hitherto been reported as to the effect of storms on telecommunication systems operating in such regions. This paper presents a survey of current understanding of the wave propagation during storms. In this first part of the review-Part I, detailed parametric assessment of some electrical and mechanical properties affecting wave propagation in sand and dust storms is given. The second part of the review-Part II describes the principle of approach and technology adopted for the investigation highlighting both strengths and drawbacks. The results demonstrate that most authors have calculated signal attenuation effect, revealing that it is not very significant unless during severe storms. A few papers indicate the possibility of more significant cross polarisation. Part I explicitly gives an account of the sand and dust storms' phenomenon, reviews the storms' parameters affecting electromagnetic wave propagations and discusses the microwave and millimeter wave bands.

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Section: Permittivitymentioning

confidence: 99%

Section: Permittivitymentioning

confidence: 99%

Review and Assessment of Electromagnetic Wave Propagation in Sand and Dust Storms at Microwave and Millimeter Wave Bands --- Part I

Musa¹,

Bashir²,

Abdalla³

2014

PIER M

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“…Also the permittivity of the sand particles is an important factor [15]. Attenuations in the order of 1 dB/km were derived from several theories [e.g., 16], but the measured attenuations were often much higher. For instance, 34 dB/km was obtained for the incident frequency of 9.4 GHz [41].…”

Section: Theorymentioning

confidence: 99%

“…Various theoretical investigations were carried out to explain the difference. The moisture content of sand particles influences the permittivity [16,17]. The increase of moisture content results in the increase of attenuation.…”

Section: Theorymentioning

confidence: 99%

Impact of Saharan Dust on Ocean Surface Wind Speed Derived by Microwave Satellite Sensors

Ohde

2010

J Infrared Milli Terahz Waves

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In the present paper ground truth and remotely sensed datasets were used for the investigation and quantification of the impact of Saharan dust on microwave propagation, the verification of theoretical results, and the validation of wind speeds determined by satellite microwave sensors. The influence of atmospheric dust was verified in two different study areas by investigations of single dust storms, wind statistics, wind speed scatter plots divided by the strength of Saharan dust storms, and wind speed differences in dependence of microwave frequencies and dust component of aerosol optical depth. An increase of the deviations of satellite wind speeds to ground truth wind speeds with higher microwave frequencies, with stronger dust storms, and with higher amount of coarse dust aerosols in coastal regions was obtained. Strong Saharan dust storms in coastal areas caused mean relative errors in the determination of wind speed by satellite microwave sensors of 16.3% at 10.7 GHz and of 20.3% at 37 GHz. The mean relative errors were smaller in the open sea area with 3.7% at 10.7 GHz and with 11.9% at 37 GHz.

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“…The reasons why the difference is so great are analyzed to describe and predict the attenuation properly. Ghobial [8] and Ansari & Evan [9] presented the effect of moisture content of sand particles on permittivity and found that the increase of moisture content results in the increase of attenuation. But the increase is not large enough to match the measured value.…”

mentioning

confidence: 99%

Effects of charged sand on electromagnetic wave propagation and its scattering field

2006

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Based on the Rayleigh's scattering theory, the effects of sandstorms on the propagation of electromagnetic wave with different visibilities are presented by solving the scattering field of charged sand particles. Because of the electric charges on the sand surface, the theoretical attenuation will be large enough to match the measured value under certain conditions. And the results show that the effect of sand with electric charges all over its surface on electromagnetic wave attenuation is the same as that of sand without charge, which proves that electric charges distribute on partial surface of the sand in fact.

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Effect of hydroscopic water on dielectric constant of dust at X-band

Cited by 22 publications

References 1 publication

Review and Assessment of Electromagnetic Wave Propagation in Sand and Dust Storms at Microwave and Millimeter Wave Bands --- Part I

Review and Assessment of Electromagnetic Wave Propagation in Sand and Dust Storms at Microwave and Millimeter Wave Bands --- Part I

Impact of Saharan Dust on Ocean Surface Wind Speed Derived by Microwave Satellite Sensors

Effects of charged sand on electromagnetic wave propagation and its scattering field

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