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Modal attenuation in multilayered coated waveguides

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2 Author(s)
Chou, R.-C. ; Dept. of Electr. & Comput. Eng., Illinois Univ., Urbana, IL, USA ; Shung-Wu Lee

Propagation and attenuation constants of low-order normal modes in a circular waveguide lined with lossy coating layers are calculated using a generalized dispersion equation. It is found that the use of multilayered coating can significantly enhance modal attenuations over a broader frequency range compared to that for a single-layer coated structure. For a cylinder with radius a=2λ, the attenuation constants for the dominant modes are shown to increase by 20 dB per a by adding a lossless padding layer to a lossy magnetic coating. Application of this result in radar cross-section (RCS) reduction is discussed

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:36 ,  Issue: 7 )