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Electromagnetics Blog Posts

Modeling Electromagnetic Waves and Periodic Structures

January 17, 2014

Oftentimes, it is of interest to model an EM wave (light, microwaves) incident upon periodic structures, such as diffraction gratings, metamaterials, and frequency selective surfaces.

Simulating an RF MEMS Switch

January 7, 2014

An RF MEMS switch is typically made up of a micromechanical bridge or cantilever, a substrate, and an electrode or dielectric layer. You can design such a device using RF simulation.

Red Blood Cell Separation from a Flow Channel

January 3, 2014

Lab-on-a-chip technology can be used to separate red blood cell via magnetophoresis — for example, motion induced by magnetic fields. Simulation can be used to optimize such devices.

MEMS Microphone Model Presented at ASA 166 in San Francisco

January 2, 2014

What is a MEMS microphone? Learn about this versatile device, as well as how to model it using COMSOL Multiphysics® with the add-on MEMS Module and Acoustics Module.

The Linac-MR Project: Tumor Tracking and Treatment

December 30, 2013

Not too long ago, my colleague Jennifer wrote a blog post about the Cross Cancer Institute, and the research being conducted there into the design of a new device for treating cancerous tumors. The device, known as the Linac-MR, is revolutionary due to its ability to both image and treat cancer cells simultaneously — a capability that had previously been regarded as near impossible due to the conflicting physics interactions involved. Such a device would allow for extremely precise radiation […]

Optimizing Recloser Performance with Simulation

December 24, 2013

During snow storms or windy days, a branch might break and short-circuit a power line’s electric current as it falls. The first task of a recloser is to interrupt this short-circuit, i.e. to open or disconnect the affected overhead line from the feeding network source. The second task is to try to re-establish power after a short time by to re-closing the line, taking advantage of the fact that most of the reasons for a short-circuit of an overhead line […]

Microwave Plasmas

December 11, 2013

Microwave plasmas, or wave-heated discharges, find applications in many industrial areas such as semiconductor processing, surface treatment, and the abatement of hazardous gases. This blog post describes the theoretical basis of the Microwave Plasma interface available in the Plasma Module.

COMSOL 4.4 Brings Particle-Field and Fluid-Particle Interactions

December 5, 2013

The trajectories of particles through fields can often be modeled using a one-way coupling between physics interfaces. In other words, we can first compute the fields, such as an electric field, magnetic field, or fluid velocity field, and then use these fields to exert forces on the particles using the Particle Tracing Module. If the number density of the particles is very large, however, the particles begin to noticeably perturb the fields around them, and a two-way coupling is needed […]


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