The Propagation Constants of Higher-Order Modes in Coaxial Waveguides With Finite Conductivity
Source: International Journal of Infrared and Millimeter Waves, Volume 26, Number 1, January 2005 , pp. 29-39(11)
Abstract:Overmoded coaxial waveguides have been used in coaxial gyrotrons as a key interaction structure. To achieve the required mode selectivity, the resistivity of the center conductor is properly chosen to damp unwanted modes. Considering attenuation due to conductor loss, this study employs the perturbational method to determine the propagation constants of higher-order modes in the coaxial waveguide. The validity of the theoretical model is confirmed by comparison with results obtained using the high-frequency structure simulator (HFSS). Moreover, the method proposed herein is applied to analyze the ohmic mode selection of the coaxial waveguide.
Document Type: Research Article
Affiliations: 1: Department of Communication Engineering, National Penghu Institute of Technology, Penghu, Taiwan, 2: Department of Electrical Engineering, Southern Taiwan University of Technology, Tainan, Taiwan,
Publication date: 2005-01-01