Parallel Physical Optics Simulation Of Quasi - Optical System

Quasi-optical system is largely adopted in the design of millimeter and submillimeter wave radio telescopes and scientific instruments at home and aboard present. In comparison with many other transmission lines, quasi-optical technique, which making use of the propagation of electromagnetic wave in a paraxial beam in millimeter/submillimeter and terahertz spectrum, is with lower loss from media and higher power-handling capability and the ability of working with multi-mode and multi-polarization. But a fast and efficient analysis and simulation method is lacking in a quasi-optical system composed of large scale reflectors or a quasi-optical system with large number of mirrors and lenses. The purpose of research work in this paper is attempting to solve this problem.In general, a certain number of both mirrors and lenses are included in quasi-optical system. But the traditional Physical Optics method can only deal with reflective optics. In this paper, obeying the rule of asymptotic high frequency method, the plane-wave reflection/transmission formulas are employed at the dielectric interface. With this extended Physical Optics algorithm, we can handle both reflective and refractive optics. A set of simulation software is developed based on the extended Physical Optics algorithm for the convenience of engineering application. It can offer the modeling of feed, mirror with the shape of plane, sphere, paraboloid, hyperboloid and ellipsoid, and lens and so on. It can analyses the distribution of near-field and far-field of a quasi-optical system and can draw the figure of both of them. This set of software is simply in modeling. The speed of the simulation computation is fast and the simulation result meets the demand of accuracy.Firstly, the concepts about quasi-optics, quasi-optical techniques and quasi-optical system are introduced in brief. Then a detailed discussion is drawn about the characters and components of quasi-optical system. An introduction of the typically used methods in the analysis of quasi-optical system is presented, and comparison is made to analysis advantages and disadvantages of each. In this paper, an extended algorithm of Physical Optics is proposed, which is capable of both reflective and refractive optics with enough accuracy and computational efficiency.According to the modeling needs of extended Physical Optics algorithm, clear descriptions about both the modeling method of interfaces in Quasi-optics system and the algorithm of mesh generation are given.Explanation about the graphical user interface and parallel computing are presented in this paper. The code design is omitted due to limited space.Finally, two simulation examples are presented. Results comparison with full-wave method and measurement and performance analysis are made to quality the good ability of this software.