The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The A-$\Phi $ formulation with generalized-Lorenz gauge is free of catastrophic breakdown in low-frequency regime. In the formulation, A and $\Phi $ are completely separated and Maxwell’s equations are reduced into two independent equations pertinent to A and $\Phi $ . This, however, leads to more complicated equations in contrast to the traditional E formulation. The numerical dicretization...
In this paper, we propose a new integral equation method based on the formulations for vector potential A and scalar potential Φ. The new formulation, which is immune from low-frequency breakdown problem, is proposed for both electromagnetic scattering and circuit problems. Since both vector and scalar potentials are important for capturing the low-frequency physics, the contribution from scalar potential...
In this paper, a solution to the double curl equation with generalized Coulomb gauge is proposed based on the vectorial representation of the magnetic vector potential. Coulomb gauge is applied to remove the null space of the curl operator and hence the uniqueness of the solution is guaranteed. However, as the divergence operator cannot act on the curl-conforming edge basis functions directly, the...
In this paper, a full-wave semi-analytical solution of self and mutual impedances for a coil-based system is proposed. It consists of two concentric circular coils with rectangular cross sections. Traditionally, the calculation of self and mutual impedances of these coils are based on eddy current approximation, where a simple background is assumed to achieve analytical and semi-analytical solutions...
Electromagnetic scattering by dielectric objects in the presence of a layered medium is investigated by applying the Poggio-Miller-Chang-Harrington-Wu-Tsai (PMCHWT) equation combined with the layered medium Green's function. Due to the electric field integral equation (EFIE) operator involved, the spectrum of the PMCHWT equation is also undesired. When the surface is densely discretized, the condition...
In this paper, the wireless power transfer system based on magnetic-coupled resonators is modeled and optimized by using low-frequency integral equation solver. For the low-frequency transfer system, the mesh size after discretization is usually much smaller than the wavelength. Hence, the low-frequency solvers are proposed to model this kind of structures with tiny meshes. After the spiral resonators...
Traditional equivalent source reconstruction methods are only operating at a single frequency point each time. However, for wide band radiators, their computation cost of the source reconstruction increases linearly with the number of frequency points. In this paper, a wide-band equivalent source reconstruction method (WB-SRM) based on the Neville-type Stoer-Bulirsch (SB) algorithm is developed. Supported...
This paper reviews our recently developed fast and efficient algorithms for multiscale structure modeling. Low-frequency electromagnetic analysis becomes indispensable for multi-scale structures because of the involved minute length-scale compared to wavelength and mid length-scale on the order of wavelength or larger, where wave physics meets circuit physics. We are currently investigating stable...
In this paper, a simplified form of electric field integral equation with Calderón multiplicative preconditioner (CMP-EFIE) is presented for solving capacitive problems in the low-frequency regime. The decomposed three-term CMP-EFIE, though very stable, cannot capture the current accurately for a capacitor at low frequencies. By omitting the part of the hypersingular preconditioned term, the electric...
This work describes a novel modeling and simulation approach of brushless DC motor control system depended on analysis of it's mathematical model. The brushless DC motor ontology model, the voltage type inverter circuit model, the hysteresis current tracking comparative model and the PID speed controller model were constructed in the Simulink environment of Matlab. S-function was used in modeling...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.