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With the advancement of technology, modern equipment involves new functionalities that require complex media (e.g., anisotropic dispersive media such as ferrite, lossy dielectrics, or graphene) for a variety of applications. This imposes the necessity to extend simulation techniques capable of solving Maxwell’s equations in such media. However, as far as discrete time-domain models are concerned,...
The interaction between electromagnetic waves and complex media and its consequences on other physical phenomena such as hyperthermia is a crucial issue for various types of applications. To name a few, electromagnetic compatibility, microwave ovens design, medical applications, and the design of electromagnetic devices and circuits that include lossy media. In this article, we present a full-wave...
Complex dispersive media not only play some ever increasing role in modern microwave components such as isolator, circulator and phase shifter but they are also involved in computational dosimetry. Recently, a general TLM (Transmission-Line Matrix) procedure based on the Symmetrical Condensed Node (SCN) was proposed to model such media: field components are corrected at every time step by a filtering...
Ferrite material plays an important role in modern microwave components such as isolator, circulator and phase shifter. Also, they provide some agility to externally tune devices by adjusting a DC magnetic field which modifies the constitutive parameters. However, ferrite medium is complex and elaborated modelling procedures are required to carry out full-wave electromagnetic simulation. A general...
Time-Domain volumic methods in electromagnetics, such as Finite-Difference (FDTD), Finite Integration Technique (FIT) or Transmission-Line Matrix (TLM) methods are investigated when dealing with structures that contain interfaces separating media with highly different constitutive parameters. Similar issues appear when dealing with adjacent irregular structured meshes with high step-size ratio. Simulation...
Inherent to time-domain method that use space-time discretization, the model dispersion produces field propagation velocity error. In methods such as finite-differences or TLM in time domain, it is customary to choose a maximum mesh size of one tenth of the minimum operating wavelength. If this criterion is easily applicable for normal ordinary media, it is more ambiguous to give interpretation of...
Like other so-called volumic methods, the TLM requires artificial boundaries when simulations of open problems are performed. There are two cases for which artificial boundaries are needed: when structures under investigation are surrounded by unbounded space or when discontinuity characterization needs matched loads. These artificial boundaries enforce conditions commonly named absorbing boundary...
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