Comparative Study of a 15 GHz Coaxial Bragg Reflector

A 15 GHz coaxial Bragg reflector corrugated with sinusoidal ripples is studied by the coupled mode theory. Numerical analysis is carried out to compare with the software CST microwave studio. It is found that, although the results obtained by the coupled mode theory and the software are in agreement, both the calculation time and memories used by the coupled mode theory are much less than that needed by the software CST, and especially, the coupled mode theory is still valid for higher-order mode and higher frequency up to hundreds giga hertz, whereas the software CST needs tremendous number of mesh cells and hence can hardly process in a PC.