Iteration method for the passive waveguide components design used in high power area

An iterative method based on coupled mode theory is proposed in this paper, also structural controlling and multi-frequency design techniques are proposed to satisfy the structural property and frequency response property requirements. The iteration method can be used to design many kinds of waveguide components. A TE01-TE11 mode converter is designed, the working frequency of which is 35 GHz, and the radius is 13.6 mm. The multi-frequency technique is utilized. The bandwidth reaches 13.6%, which is the 2.3 times of conventional method.