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As a dominant physical mechanism in the highly complicated nonlinear interaction between high-power electromagnetic (EM) fields and plasmas at microwave frequencies, the ionization-diffusion mechanism results in a plasma front with an extremely high density gradient. To capture such a high density gradient and the resulting highly localized secondary EM fields, a numerical method with a high spatial...
The high-power microwave (HPM) breakdown in air would result in a sharp increase of the number density of the plasma, which generates strong secondary electromagnetic (EM) fields that can cancel the incident fields and act like a macroscopic plasma shield. If such an air breakdown takes place in a HPM device, it will result in the so-called tail erosion and severely limit the performance of the device...
In 1987, Cangellaris, Lin, and Mei proposed the time-domain finite element method as a promising numerical approach to simulating electromagnetic radiation and scattering phenomena. In this paper, we provide a brief overview of the recent progress in the development of the time-domain finite element method at the University of Illinois.
In recent years the development of high-speed circuits leads to a demand in accurate and reliable full-wave electromagnetic analysis from high frequencies all the way to DC, and thus brings a challenge to current full-wave techniques. A full-wave solver yields solutions with deteriorated accuracy or even breakdowns at low frequencies due to ill-conditioned system matrices. The same situation also...
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