Microwave electric fields of an X -band H -plane tapered iris are calculated and plotted using the moment method for the first time. The moment method results are compared with previously obtained experimental measurements and numerical results based on an equivalent circuit approach, giving confirmation that the tapered iris is both a reciprocal and asymmetrical network. The moment method results now reveal that the asymmetry stems from the asymmetry in the phase of the input and output voltage reflection coefficients, their magnitudes being equal.
Natzke, John R. and Ishii, T. Koryu, "Electric Fields of an H-Plane Tapered Iris" (1993). Faculty Publications - Department of Electrical Engineering and Computer Science. 22.