Designing Accurate EMC/EMI Testing Equipment with RF Modeling

Bridget Cunningham August 14, 2017

Compliance testing is used to ensure that various products, processes, and systems meet standard requirements. Just as important as these tests is the equipment used to perform them. This testing equipment must be designed so that it delivers precise measurements that are reflective of real-world performance. RF modeling is a useful approach to analyzing and optimizing such devices, generating greater confidence in the measurements they obtain. To showcase this, we’ll look at a well-known equipment choice in EMC/EMI testing…

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Bridget Cunningham August 3, 2017

There are many ways to improve the frequency response of frequency-selective surfaces. However, optimizing these structures can require multiple steps. Every change to a design parameter — unit cell type, polarization, substrate properties, etc. — needs the expertise of simulation engineers. Simulation apps enable those with little or no simulation experience to run analyses for their specific stage of the design process on their own.

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Jiyoun Munn July 19, 2017

When simulating electromagnetic devices, a common mistake is putting everything into a model at the same time, including a complicated geometry, complex material properties, and a mixed bag of boundary conditions. This makes the model run for a long time and you might get frustrated when your simulation results are physically wrong, without any clues as to why. Today, we will discuss how to efficiently set up simple RF, microwave, and millimeter-wave circuit models in the COMSOL Multiphysics® software.

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Caty Fairclough June 27, 2017

When looking for a cost-effective feed network, engineers can turn to the Butler matrix as a potential solution. This passive beamforming feed network is used with phased array antennas, which have applications in upcoming technologies like 5G. To efficiently analyze and design Butler matrix feed networks, we can turn to the COMSOL Multiphysics® software and the add-on RF Module.

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Bridget Paulus June 8, 2017

Solar-grade silicon is becoming more popular for applications such as communications and photovoltaics. While it’s important to keep up with this growing demand, the current method of producing solar-grade silicon is energy intensive and expensive. To find a more efficient process, researchers at JPM Silicon GmbH explored a novel method using a microwave furnace. By simulating the internal processes, they aim to optimize their microwave furnace design to produce low-cost solar-grade silicon.

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Brianne Costa May 1, 2017

We thrive on the ability to stay constantly connected to the rest of the world through technology. But there are times when our devices hold us back, distracting us when we should be working on an important project or connecting with friends over dinner. Fortunately, a device that was first theorized over 200 years ago — the Faraday cage — offers a way to take ourselves offline, if only for a little while.

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Bridget Cunningham April 24, 2017

Due to the complex pumping scheme of high-power CO2 lasers, there are many species and collisions to consider in their analysis. This makes modeling plasma behavior in these devices — a key element in their optimization — a challenging task. Applying a multilevel approach, one researcher used the COMSOL Multiphysics® software to create a full 3D model of planar discharge in a CO2 laser. The results showcase the homogeneity of the discharge while offering further potential for optimizing laser designs.

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Bridget Cunningham April 17, 2017

Optical fibers that deliver midinfrared wavelengths are in high demand for a range of relative applications. As infrared transparent materials, semiconductors are useful for this purpose when combined with silica, helping to realize a new generation of midinfrared fiber optics. While important to performance, measuring the optical losses of such structures can be challenging experimentally because of time and costs. Simulation enables us to efficiently model this behavior for varying wavelengths and fiber geometries and identify strategies to reduce losses.

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Caty Fairclough April 14, 2017

Current wireless power transfer technologies require charging stands or pads and only work over small distances, limiting their possible applications. But what if we can provide safe wireless power to electronic devices anywhere in a room, regardless of their location? The quasistatic cavity resonance (QSCR) method, developed by a team at Disney Research, may be the solution. Let’s explore the inner workings of this method as well as the simulation and experiments used to test its functionality and safety.

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Caty Fairclough April 11, 2017

Microwave filters can help prevent unwanted frequency components in the output of a microwave transmitter design. However, when the microwave system experiences thermal drift, it can be difficult to achieve high-frequency stability in the filters. To address this issue and improve filter designs, system engineers need to predict the change of the passband frequency caused by thermal expansion. As we’ll see today, one way to achieve this is with multiphysics modeling.

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Caty Fairclough March 24, 2017

Magnetic resonance imaging (MRI) systems must produce high-resolution images in order for doctors to accurately diagnose their patients. To achieve this level of image quality, there must be a known reliable base magnetic field distribution within the MRI machine and its components, such as birdcage coils. This is where simulation comes in. By designing MRI birdcage coils with the COMSOL Multiphysics® software, we can manipulate and optimize the magnetic field and improve the scanned data that MRI machines generate.

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