Near-field Electromagnetic Scattering Characteristics of Dielectric Targets in the Terahertz Regime
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摘要: 該文基于廣義的Kirchhoff阻抗邊界條件和物理光學(xué)法，對太赫茲頻段介質(zhì)體近場散射特性進(jìn)行了研究，給出了介質(zhì)體近場散射計算公式。針對在太赫茲頻段由于波長較短引起的計算量大幅提升的問題，采用以面元為計算單位、以像素為遮擋判斷單位的太赫茲頻段介質(zhì)體近場散射的快速計算方法，該方法在保證計算精度的基礎(chǔ)上，大大降低了計算復(fù)雜度和時間。計算了圓柱體和鴨嘴形介質(zhì)體在不同距離下的雷達(dá)散射截面，并且分析了電磁場與物體相互作用后，相位項在不同距離、不同頻率下對介質(zhì)體雷達(dá)散射截面的影響。
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關(guān)鍵詞:
- 雷達(dá)散射截面 /
- 圖形電磁學(xué) /
- 太赫茲 /
- 近場
Abstract: The near-field scattering characteristics of dielectric targets are studied in the terahertz band based on the generalized Kirchhoff impedance boundary conditions and the physical optics method. The formula of the near field scattering for dielectric targets is deduced. In the light of the increase in calculation amount caused by the shorter wavelength, a fast computational method using surface element as the calculating unit and pixel as occlusion judgment unit is proposed for the near field scattering computation in terahertz band. The method ensures the calculation accuracy and reduces greatly the computational complexity and the time consumption of occlusion judging. The calculation of the near-field Radar Cross Section (RCS) produced by a dielectric cylinder and a duck mouth scatterer is performed in terahertz band. Meanwhile, the effect of the phase on the near field RCS in different distances and frequency is analyzed. -
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