Scholarlink

<p>Radar-absorbing structures (RAS) for high-temperature aero-thermal environments must provide deep absorption and predictable matching-frequency stability. We design and validate a single-layer (Dallenbach) structure-integrated RAS using a CNT-modified phenolic laminate. Complex permittivity was measured by a free-space method versus CNT loading and dispersion time and mapped onto a Cole–Cole plot chart to specify an impedance-matched thickness (≈0.085–0.087·<i>λ</i><sub>center</sub>). The Glass/CNT–phenolic RAS showed close simulation–measurement agreement at room temperature and, upon heating to 350&#xa0;°C, maintained ≥ 90% absorption at <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({f}_{\text{center}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>f</mi> <mtext>center</mtext> </msub> </math></EquationSource> </InlineEquation> with small, predictable shifts forming a plateau near ~ 0.93·<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({f}_{\text{center}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>f</mi> <mtext>center</mtext> </msub> </math></EquationSource> </InlineEquation>. An epoxy counterpart became unstable above ~ 300&#xa0;°C and failed to achieve ≥ 90% absorption. Post-exposure inspection confirmed no visible delamination or blistering in the phenolic laminate. These results demonstrate high-temperature durability together with matching-frequency stability, confirming the potential of the proposed RAS for aero-thermal environments up to 350&#xa0;°C.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Design, Fabrication, and Validation of a CNT–Phenolic Dallenbach RAS with High-Temperature Matching-Frequency Stability

  • 期刊论文

  • 发表日期：

    2026年1月26日

查看全文
  • Yeon-Gwan Lee,
  • Min-Su Jang

摘要

Radar-absorbing structures (RAS) for high-temperature aero-thermal environments must provide deep absorption and predictable matching-frequency stability. We design and validate a single-layer (Dallenbach) structure-integrated RAS using a CNT-modified phenolic laminate. Complex permittivity was measured by a free-space method versus CNT loading and dispersion time and mapped onto a Cole–Cole plot chart to specify an impedance-matched thickness (≈0.085–0.087·λcenter). The Glass/CNT–phenolic RAS showed close simulation–measurement agreement at room temperature and, upon heating to 350 °C, maintained ≥ 90% absorption at \({f}_{\text{center}}\) f center with small, predictable shifts forming a plateau near ~ 0.93· \({f}_{\text{center}}\) f center . An epoxy counterpart became unstable above ~ 300 °C and failed to achieve ≥ 90% absorption. Post-exposure inspection confirmed no visible delamination or blistering in the phenolic laminate. These results demonstrate high-temperature durability together with matching-frequency stability, confirming the potential of the proposed RAS for aero-thermal environments up to 350 °C.