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E L I T E C H A N N E L PA R T N E R simulation@rand.com | RandSIM.com | 888.483.0674 Ansys HFSS vs. Ansys EMA3D Cable; Which is Right for You? 2. Field Visualizations – Once the model is solved, use HFSS to see the energy escaping from the enclosure in either a magnitude or vector format. Add animations to further understand how fields propagate from the model and then make design changes to ensure the enclosure achieves the right amount of suppression. 3. Surface Field Visualization – In addition to plotting in a 2D cross sectional plane, HFSS can also be used to look at the model from a surface visualization. Two of the most common field plots or surfaces leveraged are the E-Field and the J-Field, which help further pinpoint points of failure and necessary changes well before the fabrication phase. 4. Parametric Analysis – Once the analysis has identified the problem, the built-in Optimetrics tool can be used to create a parametric analysis over a span of design variables, so you can determine if a given design change will yield the desirable result. 5. Radiated Susceptibility – Take parametric analysis a step further by using the antenna toolkit to create a representative test antenna and a simulated EMC test environment. 6. EMC Over Frequency – HFSS solves everything inside of the frequency domain, which allows users to view different representations of the fields at different frequencies. About EMA3D Cable Where HFSS is done in the frequency domain, EMA3D Cable is done in the time domain. It is a full-wave solver that uses the Finite-Difference Time-Domain (FDTD) electromagnetic solver, and it is fantastic at solving EMI/ EMC problems in enclosures and cables. It is housed within Ansys Spaceclaim, a direct modeler, as well as the Discovery modeling platform. Engineers import enclosure designs into Spaceclaim and use EMA3D Cable simulation software to run the analyses. When a model is brought into Spaceclaim or EMA3D Cable, the software assigns a traditional FEA mesh, so fewer changes to the step plot are needed than in HFSS. This difference is convenient for mechanical engineers who don't have a lot of experience with RF or modeling inside of HFSS. Uses of EMA3D Cable for EMC • Import SIwave Near-Field Results – Use EMA3D Cable with Ansys SIwave, a power integrity and signal integrity analysis tool, by extracting a model's S parameters to SIwave to compute the simulated near fields from the PCB. Then bring that data into EMA3D Cable to compute the radiated fields generated from the SIwave near-field source.

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