| With the advent of information era, the demand of millimeter wave resources is increasing in military technology and national economy. But the output power of single solid state device decreases quickly with the increase of the frequency of millimeter wave. This can't meet the fact demand. To obtain higher power output, power synthesis technology is adopted in millimeter wave.Circular groove guide is a new type of transmission line, which was firstly introduced by prof. Yang Hong-sheng et al of southeast university. It has some attractive advantages, such as large structural dimension, higher power handling capacity, wide main-mode frequency band. It can be used in millimeter-wave and even sub-millimeter-wave bands. In this dissertation, a double-device power combiner in circular groove guide is designed based on the advantages.Research work has been done around this project as follow:Firstly, the field of the main mode in circular groove guide was obtained by use the analytical method and the numerical method (FEM) respectively. The cutoff frequency and the field pattern of the main mode were also obtained. Numerical results are good agreement with the analytical results, which verifies the mode of circular groove guide in HFSS.Secondly, the input impedance of post mount, low-pass filter, and mode converter are analyzed by the FEM method. These are the theory foundation of circular groove guide power combiners and give help in the practical testing of circular groove guide power combiners.Finally, we made a circular groove guide combiner at 8mm wave band based on the top theory and numerical results. And the testing results were made good agreement with the analytical and numerical results. |
PDF Full Text Request