The Waveguide Port Theory And Its Application In Parallel High-Order MoM

Waveguide is widely used in industrial and military. Circular waveguide and coaxial waveguide are two common types. So the analysis of the circular waveguide and the coaxial waveguide is important. Method of moments is one of the most accurate methods of computational electromagnetics. And high-order method of moments is a kind of method of moments using high order polynomial basis functions, it can reduce the number of unknown variables significantly. In high-order method of moments, the study of circular waveguide and coaxial waveguide's field source is relatively small. In this thesis, the waveguide port theory applied to circular waveguide and the coaxial line is presented, then the theory combined with parallel high-order method of moments, which form an excitation model.According to the basic theory of electromagnetic field and the different transmission modes of circular waveguide and coaxial, the port of the waveguide equivalent model established using equivalence principle. Then the integral equations at the waveguide port is introduced. With the combination of the theory waveguide port and high-order Mo M, two kinds of excitation models are established which can load waveguide field excitation and analog port matching.Finally, using the method introduced in this thesis calculate the model with waveguide port feeder, including horn antenna, reflector antenna, circular waveguide filters which feed by circular waveguide port and microstrip filter and cavity filter which feed by coaxial waveguide port. And the calculations results contrast with commercial software with a good agreement, so as to validate the correctness of the theory and feasibility.