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This paper presents a simple method of estimating the attenuation constant due to conductivity losses and surface finish in a helix slow-wave structure, using the quality factor and dispersion characteristics obtainable from the eigen-mode solutions through 3D HFSS modeling. The method has been benchmarked against two practical structures published in the literature, and effect of surface finish on...
Attenuator-coated helix-support rods in a helical slow-wave structure were modeled by considering them to be made up of lossy dielectric material having equivalent bulk conductivity. The same conductivity values were used in 3D HFSS modeling of the helical slow-wave structure having the helix supported by three such support rods inside a metal envelope, and the attenuation constant of the structure...
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