Millimeter-wave emission characteristics of bilayer radar-infrared compound stealth material

Yayun Cheng; Fei Hu; Feng He; Liang Wu; Xiaoqin He

doi:10.3788/COL201614.062802

Journals >Chinese Optics Letters >Volume 14 >Issue 6 >Page 062802 > Article

Chinese Optics Letters
Vol. 14, Issue 6, 062802 (2016)

Millimeter-wave emission characteristics of bilayer radar-infrared compound stealth material

Yayun Cheng^1、2, Fei Hu^1、2, Feng He^1、2、*, Liang Wu^1、2, and Xiaoqin He^1、2

Author Affiliations

¹School of EIC, Huazhong University of Science and Technology, Wuhan 430074, China

²National Key Laboratory of Science and Technology on Multi-Spectral Information Processing, Wuhan 430074, China

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DOI: 10.3788/COL201614.062802 Cite this Article Set citation alerts

Yayun Cheng, Fei Hu, Feng He, Liang Wu, Xiaoqin He. Millimeter-wave emission characteristics of bilayer radar-infrared compound stealth material[J]. Chinese Optics Letters, 2016, 14(6): 062802 Copy Citation Text

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Abstract

To achieve radar and infrared stealth, an infrared stealth layer is usually added to the radar absorbing material (RAM) of stealth aircraft. By analyzing the millimeter-wave (MMW) emissivities of three stealth materials, this Letter investigates the impact of the added infrared stealth layer on the originally “hot” MMW emission of RAM. The theoretical and measured results indicate that, compared with the monolayer RAM, the MMW emission of the bilayer material is still strong and its emissivity is reduced by 0.1–0.2 at almost every incident angle. The results partially demonstrate the feasibility of detecting stealth aircraft coated with this bilayer stealth material.

E^{i} = \hat{y} E_{y} = \hat{y} \exp [j ω t - j k_{0} \sin θ + j k_{0} z \cos θ],

(1)

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(\frac{\partial^{2}}{\partial x^{2}} + \frac{\partial^{2}}{\partial z^{2}} + ω^{2} μ ϵ) E_{y} = 0 .

(2)

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E_{y} = (A_{m} e^{j k_{z m} z} + B_{m} e^{- j k_{z m} z}) e^{- j k_{0} x \sin θ},

(3)

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k_{z m} = {(ω^{2} μ_{m} ϵ_{m} - k_{0}^{2} \sin^{2} θ_{0})}^{1 / 2},

(4)

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H_{x m} = \frac{k_{z m}}{ω μ_{m}} (A_{m} e^{j k_{z m} z} - B_{m} e^{- j k_{z m} z}) e^{- j k_{0} x \sin θ},

(5)

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H_{z m} = \frac{k_{0} \sin θ}{ω μ_{m}} (A_{m} e^{j k_{z m} z} + B_{m} e^{- j k_{z m} z}) e^{- j k_{0} x \sin θ} .

(6)

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[\begin{matrix} A_{m} e^{- j k_{z m} d_{m}} \\ B_{m} e^{j k_{z m} d_{m}} \end{matrix}] = M_{m (m + 1)} [\begin{matrix} A_{m + 1} e^{- j k_{z (m + 1)} d_{m + 1}} \\ B_{m + 1} e^{j k_{z (m + 1)} d_{m + 1}} \end{matrix}] .

(7)

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M_{m (m + 1)} = \frac{1}{2} (1 + \frac{μ_{m} k_{z (m + 1)}}{μ_{m + 1} k_{z m}}) \times [\begin{matrix} e^{j Θ} & R_{m (m + 1)} e^{- j Θ} \\ R_{m (m + 1)} e^{j Θ} & e^{- j Θ} \end{matrix}],

(8)

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R_{m (m + 1)} = \frac{μ_{m} k_{z m} - μ_{m} k_{z (m + 1)}}{μ_{m} k_{z m} + μ_{m} k_{z (m + 1)}},

(9)

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Θ = k_{z (m + 1)} (d_{m + 1} - d_{m}),

(10)

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[\begin{matrix} 1 \\ R \end{matrix}] = M_{01} M_{12} M_{23} [\begin{matrix} T e^{- j k_{z 3} d_{3}} \\ 0 \end{matrix}],

(11)

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e = 1 - {| R |}^{2} .

(12)

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T_{B} (θ, p) = e (θ, p) T_{0} + [1 - e (θ, p)] T_{a m} (θ, p),

(13)

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e (θ, p) = \frac{T_{B} (θ, p) - T_{a m} (θ, p)}{T_{0} - T_{a m} (θ, p)} .

(14)

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Yayun Cheng, Fei Hu, Feng He, Liang Wu, Xiaoqin He. Millimeter-wave emission characteristics of bilayer radar-infrared compound stealth material[J]. Chinese Optics Letters, 2016, 14(6): 062802

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