THz radiation characteristics of the electric dipole in anisotropic media
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摘要: 研究了THz波段强降雨环境下电磁源的辐射特性。基于通用的麦克斯韦方程组和解析分析，提出了各向异性介质中的洛仑兹规范，得到了矢量势的非齐次波动方程及矢量势的精确表达式，并证明了它们的有效性。获得了各向异性介质中电偶极子的辐射场，将各向异性介质退化为各向同性时，得到的辐射场与已有资料中的辐射场一致。基于石膏晶体和强降雨介质的各向异性参数，对电偶极子的辐射特性进行了物理模拟和分析，结果发现：介质的各向异性对其中电磁源辐射有着显著的影响，强降雨中电磁源的辐射具有较弱的各向异性。Abstract: This article aims at the radiation property of the electromagnetic sources buried in heavy rainfall. Based on general Maxwell equations and analytical analysis, the Lorentz gauge of the anisotropic medium is proposed, the non-homogeneous wave equation of vector potential is obtained, the exact solutions of the vector potential of these medium are obtained, and their validity is proved. The radiation field of the current element in the anisotropic medium is obtained. When the anisotropic medium is changed into the isotropy material, the radiation field obtained is consistent with the available references. Based on the anisotropic parameters of gypsum crystal and heavy rain medium, the radiation characteristics of current element are physically simulated and analyzed. It is found that the anisotropy of the medium has a significant effect on the electromagnetic source radiation and the radiation of the electromagnetic source in heavy rainfall has the weak anisotropy.
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Key words:
- radiation /
- rain media /
- potential /
- anisotropy /
- THz wave
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图 1 能流密度随
$\theta$ 的变化Figure 1. Variation of energy flux density with angle
$\theta$ f=0.3 THz, θ0=π/4, φ0=π/4
图 2 能流密度随
$\phi$ 的变化Figure 2. Variation of energy flux density with angle
$\phi$ f=0.3 THz, θ0=π/4, φ0=π/4
图 3 能流密度随
${\theta}$ 和${\varphi}$ 的变化Figure 3. Variation of energy flux density with angles
${\theta}$ and${\varphi}$ 
图 5 仰起角对辐射的影响
Figure 5. Radiation of y-direction varies with elevation angle
r=3.5 km f=0.4 THz, Idl1=0.6235Idl, Idl2=0.4717Idl, Idl3=0.6235Idl
图 6 初始方位角对分量
$\left| {\Delta {E_\theta }} \right|$ 的影响Figure 6. Variation of the component
$\left| {\Delta {E_\theta }} \right|$ with the initial azimuth
图 7 初始方位角对分量
$\left| {\Delta {E_\phi }} \right|$ 的影响Figure 7. Variation of the component
$\left| {\Delta {E_\phi }} \right|$ with the initial azimuth
图 8 距离的变化r对y轴方向辐射的影响
Figure 8. Radiation of y-direction with distance
$r$ $f = 0.34 \; {\rm{TH}{\textit{z}}},I{\rm{d}}{l_1} = 0.6235I{\rm{d}}l,I{\rm{d}}{l_2} = 0.4717I{\rm{d}}l,I{\rm{d}}{l_3} = 0.6235I{\rm{d}}l$
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