Figure 7 - uploaded by Abdelrahman Ijjeh
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VI, original domain discretized (thin PEC wire of radius 1mm). The number of cells is 1732. Mesh created using COMSOL.
Source publication
![Figure 1.A, TLM one-dimensional cell [1.A]](profile/Abdelrahman-Ijjeh/publication/282864705/figure/fig62/AS:434137074016262@1480517752421/A-TLM-one-dimensional-cell-1A_Q320.jpg)
During this PhD project, we worked on time-domain numerical techniques in electromagnetism for analysing structures that include complex media. We used transmission-line matrix method (TLM) as a computational method to implement a general electromagnetic simulator. Then, it was validated by several comparisons with analytical solutions and measurem...
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Citations
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 TLM (Transmission-Line Matrix) procedure is proposed to model those media in time-domain. It accounts for effects such as non-homogeneous DC magnetization and arbitrary magnetization state by inserting a physical causal model and coupling static simulation to accurately account for the demagnetization field which depends also on the ferrite sample geometry.
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 process at the node center. However, SCN requires operations and storage of 18 voltages in general. Other nodes with reduced number of voltages were proposed and studies have shown that for lossless media, some computer cost reduction was obtained at the price of slightly more dispersion. In this paper, it is proposed to investigate on the performance of the various nodes, in terms of computer expenditure, in presence of dispersive, non-homogenous media.
