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Modeling of 3-D Surface Roughness Effects With Application to μ-Coaxial Lines

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2 Author(s)
Milan V. Lukic ; Dept. of Electr. & Comput. Eng., Colorado Univ., Boulder, CO ; Dejan S. Filipovic

Effects of 3-D surface roughness on the propagation constant of transverse electromagnetic transmission lines are calculated using finite-element method software by solving for the fields inside conductors. The modeling is validated by comparison with available literature results for the special case of 2-D surface roughness and by simulations using the finite-integration technique. Results for cubical, semiellipsoidal, and pyramidal indentations, as well as rectangular, semicircular, and triangular grooves in conductor surfaces are presented. A developed surface roughness model is applied to rectangular mu-coaxial lines. It is shown that roughness contributes up to 9.2% to their overall loss for frequencies below 40 GHz

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:55 ,  Issue: 3 )