34 results about "Electric-field integral equation" patented technology

The invention discloses a method for simulating the wide-band electromagnetic scattering property of a conductor target. The method comprises the following steps that the geometric model of the conductor target is built, and mesh generation is conducted on the surface of the conductor target by a curved surface triangle unit; a time domain electric field integral equation of the conductor target is determined; a surface induction current in the time domain electric field integral equation expands through a space CRWG primary function and a time delay primary function; an expanding surface induction current expression is substituted into the time domain electric field integral equation, and then the time domain electric field integral equation in a discrete form is tested in a time and space mode so as to obtain a system impedance matrix equation; singularity integrals are eliminated to obtain a sparse expression of a impedance matrix; the equation of the impedance matrix is solved to determine the distribution of the time domain current of the surface of the conductor target, and wide-band electromagnetic property parameters of the target are obtained according to the distribution of the time domain current so as to finish simulation. The method for simulating the wide-band electromagnetic scattering property of the conductor target has the advantages of being high in simulation precision, little in required time and low in memory consumption, and has wide application prospect.

The invention relates to an impedance load point selection method for electromagnetic scattering of high tension overhead transmission lines. The method comprises that (1) an electric field integration equation of induction current generated by excitation of a metal conductor incident field of the transmission lines is established; (2) the electric field integration equation is converted into a metal-conductor matrix equation set based on a matrix method; (3) an overhead-line matrix equation set is established based on frequency-domain multi-conductor transmission line method; (4) a mixed equation set of the metal-conductor matrix equation set and the overhead-line matrix equation set is established; and (5) the impedance load point of electromagnetic scattering of the high tension overhead transmission lines is selected according to the mixed equation set. The provided method is highly accurate, and can be used to select the optimal load point when the electromagnetic scattering for electromagnetic waves of specific frequency of the high tension transmission lines is inhibited, and thus, electromagnetic scattering for different types of radio stations of the high tension transmission lines can be inhibited in an economical and efficient way.

The invention provides a laminated matrix decomposition-based low frequency electromagnetic property simulation method. Firstly, the problem of low frequency collapse of the conventional electric field integral equation method is eliminated by employing an augmented electric field integral equation method; a low frequency multi-level fast multi-pole method is adopted to establish a laminated matrix expression for the coefficient matrix of the augmented electric field integral equation; the laminated matrix is further compressed by using a double compression method to remove redundant information; finally, a laminated matrix format algorithm is adopted to perform upper-lower triangular decomposition on the compressed laminated matrix. The laminated matrix decomposition can reduce calculating complexity and memory consumption to be almost linear; a precondition technology is constructed for an iteration solution and a direct solution is constructed. The method has the advantages of high solving speed, low memory consumption and precision controllability and can be applied to various kinds of low frequency electromagnetic property analysis.

The invention provides a full wave analysis method for a microstrip circuit based on improved MDA (model driven arthitecture) -SVD (singular value decomposition) compression representation. The method comprises the following steps of establishing an octree structure for a target to be analyzed; acquiring sparse low rank representation which is formed by a discrete electric field integral equation and corresponds to a far field action part in a dense impedance matrix by the MDA-SVD method; then representing the part which is represented by the low rank in the impedance matrix by the improved MDA-SVD method; and finally, constructing an algorithm which quickly calculates matrix vectors and is suitable for iteration computation on the basis of the MDA-SVD method representation. According to the full wave analysis method for the microstrip circuit, on the basis of the traditional MDA-SVD method, a new compressed format is constructed to represent the impedance matrix, so that memory requirements and computation complexity can be effectively reduced, and computation time is shortened.

The invention discloses a rotational symmetric body electromagnetic scattering property simulation method based on matrix nest compression. The method includes the following steps: building a generatrix of a rotational symmetric body, performing subdividing and discretization to obtain subdivided line segments, establishing a binary tree grouping relation among the subdivided line segments, establishing an index relation between a near-field group and a far-field group, establishing an electric field integral equation of the rotational symmetric body, determining a simulating vector and the total number of modes, breaking every thinnest-layer far-field group mode impedance matrix into two strip-shaped matrixes to be stored respectively with a matrix extraction method, dividing the far-field group impedance matrixes into parent layer near fields and parent layer far fields through the index of layers, performing nest processing layer by layer, breaking each far-field impedance matrix into small matrixes, sequentially determining mode impedance matrixes of all the modes, solving the equations of the mode impedance matrixes one by one, calculating and obtaining far-field information according to the reciprocal theorem to complete the simulation. The method is low in memory consumption, high in equation iteration speed, and capable of efficiently simulating electromagnetic scattering properties of the rotational symmetric body in a large size.