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| Citation: | Chen Gang, Dang Hongxing, Tan Xiaomin, Chen Hui, Cui Tiejun. Scattering Properties of Electromagnetic Waves from Randomly Oriented Rough Metal Plate in the Lower Terahertz Region[J]. Journal of Radars, 2018, 7(1): 75-82. doi: 10.12000/JR17093
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Scattering Properties of Electromagnetic Waves from Randomly Oriented Rough Metal Plate in the Lower Terahertz Region
DOI: 10.12000/JR17093
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Abstract
An efficient hybrid algorithm is proposed to analyze the electromagnetic scattering properties of an infinitely thin metal plate in the lower terahertz (THz) frequency region. In this region, the metal plate can be viewed as a perfect electrically conductive object with a marginally rough surface. Hence, the THz scattered field from the metal plate can be divided into coherent and incoherent parts. The physical optics and truncated-wedge incremental-length diffraction coefficients methods are used to compute the coherent part, whereas the small perturbation method is used to compute the incoherent part. Then, the radar cross section of the rough metal plate surface is computed by the multilevel fast multipole and proposed hybrid algorithms. The numerical results show that the proposed algorithm has a good accuracy when rapidly simulating the scattering properties in the lower THz region. -
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References
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- Figure 1. Schematic diagram of the scattered field with PO method
- Figure 2. Schematic diagram of rough surface scattering
- Figure 3. Schematic diagram of an infinitely thin rough PEC plate
- Figure 4. Monostatic VV-polarization RCS of the infinitely thin PEC plate by MLFMA algorithm
- Figure 5. Bistatic VV-polarization RCS of the infinitely thin PEC plateby MLFMA algorithm
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Figure 6. Bistatic VV-polarization RCS of the infinitely thin rough PEC plate at 300 GHz. The incident direction is given by
${\theta _{\rm{i}}}$ ${\varphi _{\rm{i}}}$ ${\theta _{\rm{s}}}$ ${\theta _{\rm{s}}}$ ${\varphi _{\rm{s}}}$ -
Figure 7. Bistatic HH-polarization RCS of the infinitely thin rough PEC plate at 300 GHz. The incident direction is given by
${\theta _{\rm{i}}}$ ${\varphi _{\rm{i}}}$ ${\theta _{\rm{s}}}$ ${\theta _{\rm{s}}}$ ${\varphi _{\rm{s}}}$ -
Figure 8. Bistatic VV-polarization RCS of the infinitely thin rough PEC plate at 300 GHz. The incident direction is given by
${\theta _{\rm{i}}}$ ${\varphi _{\rm{i}}}$ ${\varphi _{\rm{s}}}$ ${\varphi _{\rm{s}}}$ ${\theta _{\rm{s}}}$ -
Figure 9. Bistatic HH-polarization RCS of the infinitely thin rough PEC plate at 300 GHz. The incident direction is given by
${\theta _{\rm{i}}}$ ${\varphi _{\rm{i}}}$ ${\varphi _{\rm{s}}}$ ${\varphi _{\rm{s}}}$ ${\theta _{\rm{s}}}$ -
Figure 10. Monostatic VV-polarization RCS of the PEC infinitely thin rough plate at 300 GHz. The observation angle is from
${\theta _{\rm{i}}}$ ${\theta _{\rm{i}}}$ ${\varphi _{\rm{i}}}$ -
Figure 11. Monostatic HH-polarization RCS of the PEC infinitely thin rough plate at 300 GHz. The observation angle is from
${\theta _{\rm{i}}}$ ${\theta _{\rm{i}}}$ ${\varphi _{\rm{i}}}$