Abstract

This paper presents an improved approach for the propagation of electromagnetic (EM) fields along a helical
hollow waveguide, based on one bending and two bendings. The objective is to develop a mode model for
infrared (IR) wave propagation, in order to represent the effect of the radius of the cylinder of the helix and the
step’s angle on the output fields and the output power transmission. This model enables us to understand more
precisely the influence of the step’s angle and the radius of the cylinder of the helix on the output results of each
section of the helical waveguide, based on one bending and two bendings, for practical cases. The output power
transmission for all bending is improved by increasing the step’s angle or the radius of the cylinder of the helix,
especially in the cases of space curved waveguides. This mode model can be a useful tool to improve the output
results in all the cases of the helical hollow waveguides, based on one bending and two bendings, for industrial
and medical regimes.

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