Fast Design And Analysis Of The Waveguide Slots Arry Antennas

Waveguide slots antennas were widely used in navigation, meteorological analysis,and most military radar due to their high efficiency, low sidelobe, controlled aperture distribution and compacting structure. Besides, waveguide slots antennas are also very easy to feed and install. They were and will be the focus in all these related fields.In the thesis, the author analysed a single longitudinal slot on the broad wall of a rectangular waveguide with method of moment (MOM), which is based on the dyadic green's function theory and boundary continuity theory. With the obtained MOM results, the single slot was equivalented to a shunt admittance using circuit principle. And the admittace parameters was extraced in a further step. Through array synthesis technique, we acquired the necessary aperture distribution of the slots. Finally, we design the longitudinal slots array fastly with the help of Elliott's idea and three key formulas which were derived by the author.Applying Babinet principle, we compared the slots to the dipoles which only radiated to the related half space. Then the radiation pattern of the slots array could be calculated swiftly. We calculated the input standing wave ratio and the antenna efficiency by equaivalenting each waveguide to a transmission line, which resulted in rising necessary transmission matrix we needed in calcualtion.All the results in the thesis were compared to the Ansoft HFSS results, and we found the two results were very good in agreement. Through the data acquired, the author modified Elliott's idea and proved the correctness of the modification.