Calculation Technology Of Finite Formulation On Radio-frequency Electromagnetic Wave

Complex and high frequency electromagnetic field calculation and analysis have become an important subject to modern technologies and its development, which play a great important part in lots of fields. So, numerical calculation technology of electromagnetic field and imploring a novel calculation method are great value subject.Finite formulation method, also named after cell method, is a novel electromagnetic field numerical calculation method. The method expresses the equations of electromagnetism in finite form, starting directly from experimental facts, and has broken through the thinking model of differential and integral calculus, which has lasted for nearly one hundred years. And electromagnetic field variables to be calculated directly are easy to be measured physical variables. Comparing with the presented numerical methods, it has apparent advantages over calculating accuracy, scale,efficiency and so on.The thesis introduces the basic theory and idea on finite formulation method. Its technologies to deal with open area electromagnetic field are discussed: according to absorbing boundary conditions based on field variables , one dimension, first-order and second-order absorbing boundary conditions based on global variables are obtained; according to idea of connective boundary conditions on FDTD, connective boundary conditions on finite formulation are obtained. Through concrete calculating cases, it is proved that FFM is valid and high efficient, and has higher accuracy, providing a new ideal to calculate electromagnetic field; and boundary conditions in finite form ,gained in this article, are right. At last, applying FFM to calculating RCS, the results are compared with those obtained by FDTD, which are in good agreement.