The reduced-order spectral-element time-domain method based on the proper orthogonal decomposition method is proposed to solve the electromagnetic scattering problem based on wave equation. The spectral-element time-domain method has been proved to have the advantages of high precision and block-diagonal mass matrix, so it is widely used to solve the electromagnetic scattering problem. The POD basis is obtained by the eigenvalues and eigenvectors of the correlation matrix, which is created by the snapshot matrix whose columns are the snapshot vectors extracted from the SETD simulation. It is proved that the method can reduce the computational cost on the basis of maintaining an acceptable accuracy. Numerical results demonstrate the advantage of the reduced-order SETD method.
GaN, as the third generation semiconductor material, has attracted much attention because of its superior properties. The GaN equivalent circuit model is the basis of microwave device characteristics research and circuit design optimization. Fast extraction of circuit model parameters by optimization algorithm can accurately establish the device model. This paper presents an efficient genetic optimization algorithm to quickly extract GaN equivalent circuit parameters and obtain the optimal values of model parameters with ADS software. Considering the non-linearity in the large signal circuit model, based on the measured I-V and C-V characteristics curves under different bias voltage, the parameters in the non-linear model are extracted by using genetic algorithm, and the simulation results are compared with the measured results[3]. The comparison results are expressed in the range of 0.1~40GHz, and the model fits well. The accuracy of the proposed parameter optimization method is verified.
With the increase of power and frequency, the internal electromagnetic environment of microwave active circuits is becoming more and more complex. It is urgent to strengthen the research of electromagnetic field-circuit coupling simulation and accurately analyze the electromagnetic characteristics of complex microwave active circuits. In this paper, a discontinuous Galerkin time domain method (DGTD) based on tetrahedron and hexahedron hybrid partition is proposed to analyze the electromagnetic characteristics of complex microwave active circuits. This method can effectively realize the coupling of electromagnetic field and circuit through numerical flux, and effectively reduce the computational unknowns and improve the computational efficiency through the tetrahedral hybrid subdivision method. The numerical results are in good agreement with those in references, which verifies the accuracy of the proposed method.
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