CALCULATED DIFFRACTION PATTERNS OF DIELECTRIC RODS AT CENTIMETRIC WAVELENGTHS

1954 ◽  
Vol 32 (12) ◽  
pp. 775-781 ◽  
Author(s):  
Charlotte Froese ◽  
James R. Wait
Keyword(s):  
Electromagnetic Wave ◽  
Experimental Results ◽  
Wave Incident ◽  
Infinite Length ◽  
Dielectric Cylinder ◽  
Electromagnetic Wave Incident ◽  
Diffraction Patterns ◽  
Good Agreement

Diffraction patterns are calculated for a cylindrical electromagnetic wave incident normally on a dielectric cylinder of infinite length whose diameter is comparable to the wavelength. Reasonably good agreement is obtained when the results are compared with published experimental results.

Decay Instability of an Electromagnetic Wave Incident on a Weakly-Inhomogeneous Magnetised Plasma

1982 ◽  
Vol 37 (2) ◽  
pp. 97-101
Author(s):  
Bhimsen K. Shivamoggi
Keyword(s):  
Electromagnetic Wave ◽  
Pump Wave ◽  
Low Frequency ◽  
Langmuir Wave ◽  
Density Perturbation ◽  
Threshold Value ◽  
Wave Incident ◽  
Ion Acoustic Wave ◽  
Decay Instability ◽  
Electromagnetic Wave Incident

Abstract This paper considers the parametric decay of an electromagnetic wave incident on a weakly-inhomogeneous magnetised plasma into a Langmuir wave and an ion-acoustic wave. The Vlasov model is used in order to calculate the low-frequency electron-density perturbation produced by the beating of the side-band modes with the pump wave. The results show that the threshold value of the pump wave to undergo a decay instability drops in the presence of an inhomogeneity in the plasma.

Electromagnetic Properties of Bearing Cement-Based Materials

2011 ◽  
Vol 261-263 ◽  
pp. 663-668
Author(s):  
Ai Li Guo ◽  
Ri Gao ◽  
Heng Jing Ba
Keyword(s):  
Electromagnetic Wave ◽  
Electromagnetic Waves ◽  
Building Materials ◽  
Incident Angle ◽  
High Strength ◽  
Wave Incident ◽  
Electromagnetic Properties ◽  
Frequency Range ◽  
Electromagnetic Wave Incident ◽  
Cement Based Materials

For studying absorption/bearing integration of building materials, high-strength cement-based materials were prepared by using active fly ash, silica fume and quartz, etc. Electromagnetic parameters of the cement-based materials were measured through coaxial method, and then by means of these parameters, the reflectivity of electromagnetic waves of the cement-based materials were simulated under variable electromagnetic wave incident angle (θ), frequency (f) and thickness of the material(d).The reflectivity of electromagnetic waves with 8~18GHz frequency range vertically transmitting into the cement-based materials was obtained through far field radar scattered cross-section measurement, and was compared with simulated reflectance under the same incident conditions. The results show that the high-strength cement-based materials with imaginary part of dielectric constant can consume energy of the incident electromagnetic wave. Incident angle less than 15° has little effect on the reflectivity of the cement-based materials in 2~18GHz frequency range. While the thickness of the cement-based materials is 15mm or 25mm, simulation results of the reflectivity are in good agreement with measured ones. Measured absorption peak and -10dB bandwidth increase with the increasing of thickness of the cement-based materials with compressive strength of 120.7MPa. This suggests that the cement-based materials studied in this paper have the characteristics of absorption/bearing integration.

The diffraction of electro-magnetic waves by a semi-infinite circular wave guide

1953 ◽  
Vol 49 (4) ◽  
pp. 659-667 ◽  
Author(s):  
J. D. Pearson
Keyword(s):  
Exact Solution ◽  
Electromagnetic Wave ◽  
Wave Incident ◽  
Wave Guide ◽  
Electromagnetic Wave Incident ◽  
Electro Magnetic ◽  
Magnetic Waves

ABSTRACTAn exact solution is obtained for the diffraction of a plane harmonic electromagnetic wave incident on a semi-infinite open-ended perfectly conducting circular wave guide.

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