Title :
Modal attenuation in multilayered coated waveguides
Author :
Chou, Ri-Chee ; Lee, Shung-wu
Author_Institution :
Dept. of Electr. & Comput. Eng., Illinois Univ., Urbana, IL, USA
fDate :
7/1/1988 12:00:00 AM
Abstract :
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
Keywords :
dielectric-loaded waveguides; radar cross-sections; waveguide theory; RCS; circular waveguide; generalized dispersion equation; lossless padding layer; lossy coating layers; lossy magnetic coating; low-order normal modes; modal attenuations; multilayered coated waveguides; radar cross section reduction; Attenuation; Coatings; Engine cylinders; Equations; Frequency; Laboratories; Magnetic losses; NASA; Propagation losses; Radar cross section; Waveguide components;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
