Power loss and attenuation in a disc-loaded cylindrical waveguide

Abstract

In the present paper, a disc-loaded circular waveguide structure has been field analyzed for the power loss and attenuation characteristics. The structure has also been simulated with commercially available simulation tool'CST Microwave Studio'. The analytical results have been found in close agreement with the simulation results. Attenuation characteristics have been observed for a disc-loaded circular waveguide interaction structure made of materials of different electrical conductivity and has been observed that the material with higher conductivity results in lower attenuation. Further, the variation of attenuation characteristics has been observed for two different azimuthally symmetric modes typically TE _{01} and TE _{02} . Power loss at different surfaces of the disc-loaded circular waveguide excited in TE _{01} mode has also been observed and it has been found that the tip of the discs is the surface where maximum power loss per unit area occurs. Further, it has been found that with increasing the disc-hole radius the ohmic power loss as well as attenuation constant decreases and with increasing the structure periodicity, the ohmic power loss and attenuation increases. Hence, the structure dimensions should be optimally selected for higher bandwidths and gains.