Numerical method for solving characteristic parameters of square coaxial line

Square coaxial line has wide and practical applications to high power RF equipment, and solving its characteristic parameters is very important for engineering design. This paper presents a numerical method for inverse Schwarz-Christoffel transformations. No special initial value is needed and the convergence is guaranteed. The computational process is rapid and the computational results are accurate. Based on the technique, the characteristic impedance and distributed capacitance of square coaxial line are solved in detail.