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

The invention belongs to an electromagnetic simulation technology, and provides an integral equation grid adaptive encryption method based on non-conformal grid current discontinuity estimation, which is used for efficiently obtaining a high-precision simulation result. The method comprises the following steps: firstly, using a conformal or non-conformal triangular mesh discrete model surface, defining a MultiBranch-RWG primary function on a discrete mesh unit, establishing an electric field integral equation, and solving to obtain surface current distribution; then, according to the surface current distribution, a current discontinuity error estimation method is utilized to calculate and obtain a current discontinuity error of each grid unit; and finally, traversing current discontinuity errors of all grid units, when the current discontinuity error of any grid unit is greater than a preset threshold value, executing adaptive encryption, and executing iteration by taking the adaptively encrypted grid as input. Otherwise, outputting the grid information. According to the method, higher precision can be realized with lower calculation cost, grid generation is more flexible, and the method is more suitable for complex targets.

The invention discloses an electromagnetic modeling method and device based on rotation primary function discrete total current, and the method comprises the steps: constructing a rotation primary function based on the generated unit pair information of a non-uniform medium target, the unit pair information is splitting unit data corresponding to a body splitting unit generated after geometric splitting is carried out on the inhomogeneous medium target; removing the redundant degree of freedom of the rotation primary function to obtain a target rotation primary function set; performing numerical discretization on the electric field integral equation of the total current of the inhomogeneous medium target through the target rotation basis function set to obtain a target electric field integral equation, and testing the target electric field integral equation through the test function set to obtain a global coupling matrix equation; and carrying out iterative solution on the global coupling matrix equation to obtain the electromagnetic characteristics of the inhomogeneous medium target.

The invention relates to an interconnection line parameter extraction method based on a layered medium Green function improved moment method and a program product, and the method comprises the following steps: setting a sweep frequency parameter and a layered medium structure parameter, constructing a layered medium Green function, and carrying out the calculation to obtain an approximate solution of the layered medium Green function; establishing an electric field integral equation under the layered medium, and performing discretization processing to obtain a corresponding matrix equation; and performing iterative solution on the matrix equation to obtain the overall current distribution of the model, calculating the current value and impedance / admittance value of a port, performing electromagnetic calculation in a frequency sweep mode to obtain different port parameter values, and finally obtaining a parameter-frequency curve to complete the extraction of the port parameters. Compared with the prior art, the stratified medium Green function is fused into the frame of the enhanced electric field integral equation, electromagnetic simulation calculation of the full wave band from 0 frequency to 20 GHz can be achieved, and the method has the advantage of being high in calculation and solving efficiency.

The application provides a training method and device of a current density distribution identification model, the method comprising: inputting a plurality of sampling source points into the current density distribution identification model, and obtaining a loss function in the current density distribution identification model, which is constructed based on a current density distribution function and an electric field integral equation; wherein the loss function comprises a hyperbolic tangent function, a derivative of the hyperbolic tangent function and a product of the Green function; performing series expansion on the hyperbolic tangent function in the loss function, and extracting singular terms from the electric field integral equation in the series expanded loss function to obtain a plurality of singular integrals; performing inner integral calculation and outer integral calculation on each high-order singular integral in the singular integrals to determine the current density distribution function corresponding to the minimum value of the loss function on all sampling source points. The application can quickly solve the singular integrals comprising the hyperbolic tangent function, the derivative of the hyperbolic tangent function and the product of the Green function to obtain the current density distribution function.

The present invention relates to the field of electromagnetic computing, and specifically to a frequency domain electromagnetic computing method, which can realize efficient electromagnetic computing of complex integrated circuit structures. The technical scheme includes: dividing the calculated area into two parts, an outer area and an inner area, according to the material distribution characteristics of the integrated circuit structure; using a two-dimensional finite element method to analyze and solve the outer area, and when solving, the electromagnetic influence of the inner area on it is equivalent to an equivalent current term containing a surface admittance operator, which is added to the electric field partial differential equation obtained by the non-homogeneous Helmholtz equation in the outer area to obtain the outer area electric field equation, and the outer area field distribution is obtained according to the outer area electric field equation; when solving the inner area, according to the outer area field distribution, the field distribution of the inner area boundary is obtained by the condition of longitudinal electric field continuity, and finally the inner area field distribution is obtained by combining the electric field integral equation. The present invention is suitable for frequency domain electromagnetic efficient computing of complex integrated circuit structures.

The invention discloses a conductor ultra wide band electromagnetic scattering simulation method based on a time domain discontinuous Galerkin integral equation. The method allows calculation of target electromagnetic scattering results from ultra-low frequency to extremely high frequency under non-conformal grid conditions while covering near-field and far-field electromagnetic fields. Specifically, the method is suitable for processing a wavelength structure with the electrical size range from 1 time to 10-8 times, and the problem of low-frequency numerical value collapse is effectively solved. Compared with a frequency domain discontinuous Galerkin electric field integral equation numerical method, the method has obvious advantages in ultra-wideband scattering analysis. In addition, the method can be easily integrated into the existing time domain discrete Galerkin electric field integral equation method. Compared with an existing order stepping (MOD) method, the method has remarkable advantages, and a valuable tool is provided for ultra-wideband electromagnetic scattering analysis under the non-conformal grid condition; a plurality of typical examples verify the accuracy and effectiveness of the method at the same time.

The invention provides a training method and device for a current density distribution identification model, and the method comprises the steps: inputting a plurality of sampling source points into the current density distribution identification model, and obtaining a loss function which is constructed based on a current density distribution function and an electric field integral equation in the current density distribution identification model; wherein the loss function comprises a hyperbolic tangent function and a product of a derivative of the hyperbolic tangent function and a Green function; performing series expansion on a hyperbolic tangent function in the loss function, and extracting singular terms from an electric field integral equation in the loss function after series expansion to obtain a plurality of singular integrals; and performing inner-layer integral calculation and outer-layer integral calculation on each high-order singular integral in the singular integral to determine a corresponding current density distribution function when the loss function takes a minimum value on all sampling source points. According to the method, the current density distribution function can be obtained by quickly solving the singular integral which contains the hyperbolic tangent function and is formed by the product of the derivative of the hyperbolic tangent function and the Green function.