Undergraduate engineering students must acquire practical skills alongside learning theory to better prepare them for their career. In the last two decades, simulation softwares in electromagnetics have become widespread in both industry and academia. But these softwares are not usually taught in electrical engineering (EE) programs, thus leaving a gap in skills of graduates when entering the job market or graduate school. In the first semester of 2020-2021, a new course entitled “, Computer simulations in electromagnetics”,was designed and offered in the School of EE of Sharif University of Technology which was a new step on a national and international level. The course objective was to teach the correct methods of simulation using three widespread softwares in the field of microwave and photonics, which cover most aspects of this field. In this paper, we discuss the main ideas behind the creation of this course, its syllabus, presentation method, as well as challenges and achievements in this effort. In addition to filling the educational gap in EE programs, this laboratory increases student interest and motivation, better prepares students for future, and allows for a virtual laboratory (especially in periods such as the Covid 19 pandemic).

To calculate and evaluate wave scattering and penetration of electromagnetic waves in different biological tissues it is necessary to use a realistic model of the human body, with all tissues resolved and separately assigned with appropriate electric/magnetic properties. We report the development of a realistic 3D whole-body human model that has been adapted for simulation in CST software, containing 46 different resolved tissues with their relevant electrical properties over 1Hz-100 GHz, non-ionizing electromagnetic radiation. The model is based on whole-body magnetic resonance images (MRI) of Zubal-phantom data with voxel dimensions of 3. 6 mm. Wideband simulations are performed to show the successful application of the model in computational dosimetry. The results of the electric field calculation indicate that the peak of electric field in the body occurs at around 70 MHz, which is the same as the well-known resonant frequency of the body. Moreover, the difference between electric field intensity among tissues can be as high as 30 dB, and that tissues with lower water content (e. g. bones, knee) can generally have higher induced electric fields. High water content tissues such as the eye vitreous humor have generally lower induced electric fields. The model is available free of charge for research purposes at bioelectromag. ir.

In this paper, heat transfer and magnetic fields in a vacuum induction melting furnace have been studied numerically. To solve the coupled equations of thermal and magnetic induction heating, the finite element method has been used. An induction furnace model is simulated using an industrial geometry. The studies indicate that the effect of the geometry of the crucible and the coil on the melting time has not been thoroughly investigated and requires more indepth studies. It is attempted to improve the shape of the induction furnace, so that in less time aluminum is melted in a small scale furnace. The effect of the diameter-to-height ratio of the crucible on the duration of melting has been investigated. By decreasing the diameter-toheight ratio, the temperature reaches melting temperature in a shorter time. The results show that for the diameter-to-height ratio of less than 0. 4, there will not be a significant change at the average temperature. 10% reduction in the distance between the coils leads to an increase in the average temperature of the working material inside the furnace. With considering the constant density of the coil current and the constant induced current in the heated material, the effects of the number of coil turns on the temperature distribution and magnetic flux are investigated. In this way, the accuracy of the model is also checked by induction heating concepts. The effect of frequency on temperature has been investigated in different coil lengths. The results show that an increase of 4 times in the frequency caused an increase of 1. 7 times in the average temperature.

Since their invention, microwaves have found significant use in different fields, including medicines and food processing, as well as sterilization of microorganisms for use in biomedical treatment and research. Various scientific studies have demonstrated microwave application’, s capability as clean technology and a veritable solution for producing a pure and desirable drug candidate in bionutraceuticals processing....

A simple new closed form of the Green function for axisymmetric magnetostatic problems is found analytically in cylindrical coordinates. The result is verified by applying several examples.  

Purpose: Cell experiments are vitally dependent on CO2 incubators. The heating system of usual incubators result in undesirable induction of Electromagnetic (EM) fields on cells that result in decreased accuracy in bio-electromagnetic tests. EM shields can cause a considerable decrease in the stray fields and eliminate the undesirable induction. Materials and Methods: CST-2019 is used for simulations. five different shielding systems have been examined in this paper. We try to modify shape and material used for shielding to achieve better result. (Iron, Mu-Metal, steel). Results: We introduce a simple practical design, together with variations of previously reported ones, and numerical evaluation of their magnetic field attenuation. Conclusion: The targeted design decreases the field within the shield to about 0. 03 times of the incident magnetic field, while having holes for air and CO2 exchange.

This paper poses two magnetostatic problems in cylindrical with different ‎permeabilities for each region. In the first problem the boundary condition of the ‎second kind is used while in the second one, the boundary condition of the third kind ‎is utilized. These problems are solved using the finite element and finite difference ‎methods. In second problem, the results of the finite difference method show low ‎magnetic vector potential as well as the magnetic field density when compared t the ‎finite element results and in the linear case, to the analytical solution. This paper ‎investigates the reason behind the low magnetostatic field computation in cylindrical ‎coordinates using the finite difference method when boundary condition of the third ‎kind is used. It then, presents a technique to overcome the problem of low magnetic ‎field calculation using the finite difference method. The results obtained by the new ‎technique are in close agreement with the finite element method as well as the ‎analytical solution. Finally, it analyzes the possible source of error in modeling ‎magnetostatic boundary conditions in finite difference formulation of vector Poisson ‎or Laplace"s equation in cylindrical coordinates‎‏.‏

In this paper, some applications of the Method of Least Squares (MLS) for the solution of various problems in electromagnetics engineering is briefly reviewed. Here, MLS is employed for the solution of various problems such as solution of equations, curve fitting to measured data, generalized Fourier coefficients, linear operator equations, inegro-differential equations, electrostatics and magnetostatics problems, boundary value problems (by the Least Square Boundary Residual Method LSBRM), design of impedance transformers and matching by step and tapered lines, optimum design of multihole directional couplers, coupled-line couplers, branch line couplers, ring couplers, analysis of wire antennas, antenna pattern synthesis, array synthesis and scattering. In this study, it becomes clear that MLS can be applied to devise effective numerical algorithms for the analysis and design of problems in the subject areas of radiation, scattering, antennas, microwaves, engineering mathematic, etc. Some papers and books published in the area of MLS applications for the analysis and design of problems in electromagnetics engineering are grouped and presented in references.