Research Of Tabulated Feed And Reflector Distortion Based On Dgba

Millimeter and sub-millimeter wave is a new hot topic around the world, the research of millimeter wave was started from1960s. After years of research, now millimeter and sub-millimeter wave has been applied in many industries. In the aerospace industry, the European Space Agency’s Planck deep space probes,"Chang-e Ⅲ" satellites and "braggadocio One" satellites have been successfully launched. In the biomedical field, millimeter-wave radiation has been applied to gastrointestinal disease. In the military field, the millimeter-wave radar got high tracking precision and wide search range, it is more suitable to be located in bad climatic conditions.The system and techniques to analyze the millimeter or sub-millimeter wave are called quasi-optical system and techniques. Diffracted Gaussian Beam Analysis, short for DGBA, can be used to analyze the’electromagnetic field of antenna system. Several quasi-optical systems have already been applied. Currently the most widely used software is a commercial software GRASP which is based on physical optical method. Compared to DGBA, when simulating large-size antenna system, the GRASP is time consuming, on the other hand, the calculation of DGBA is more concise.In this paper, the research.of tabulated feed module and reflector distortion module has been done. Tabulated feed module is a general way to represent the radiation pattern from a feed. This paper implements the feed spherical wave expansion, for the given far-field tabulated measurements data of a feed, more electromagnetic field information can be got by the spherical wave expansion, and finally the simulation and comparison have been done based on the induced field information. By the ideal Gaussian feed simulation and comparison, the accuracy of code has been verified; By the simulation and comparison of the induced tabulated measurements data, the accuracy of the module has been verified, too.This paper has also finished the evaluation of the influence on the antenna system of the reflector distortion. In this paper, the reflector numerical expression has been introduced, reflector distortion was made, and the model of antenna system with reflector distortion has been created. At the last, simulation and comparison of the model has been done.