All EMCs
Electromagnetic simulation of anechoic chambers is a very difficult task. Gwenaël Dun, R&D Engineer for Siepel, used a variety of different electromagnetic simulation tools to address this challenge in the past but ran into problems with both poor accuracy and long compute times. He then worked with the developers of CST MICROSTRIPES™ electromagnetic simulation software, to implement a feature that makes it possible to model the ferrite absorbers used in the chamber as a boundary condition rather than part of the computational domain. This change made it possible to increase mesh size by a factor of 15, reducing compute time by more than 95%. The simulation results provided a near-perfect match to physical testing.
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This article deals with the modeling and simulation of shielded twisted pairs with CST CABLE STUDIO™. The quality of braided shields is investigated with respect to perfect solid shields. Crosstalk effects are calculated for unshielded twisted pairs, poorly shielded twisted pairs, and twisted pairs with high-quality shields. Explanations are given for the set up of realistic simulations in order to be able to compare them with measurement results.
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Transmitters used in vehicle environments present potential threats to the health and safety of vehicle users, in terms of both human exposure to electromagnetic fields and vehicle EMC (electromagnetic compatibility). The recently revised automotive EMC directive (2004/104/EC) now requires vehicle manufacturers to identify acceptable frequencies, powers and antenna installations that can be used on vehicles without compromising their EMC performance.
The simulations presented here were performed with CST MICROSTRIPES™.
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P. Sochoux, Cisco
Video of an Innovations 2009 workshop series presentation.
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John Contreras and Al Wallash, Hitachi Global Storage Technologies, presentation at the 5th North American Userforum, 2008.
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Heatsinks are large conductive objects which are typically ungrounded and placed above ASICs or other ICs. They may pickup and enhance radiation. With today's SerDes line rates, wavelength sizes in the system are now comparable to heatsink sizes.
A design flow is proposed that will allow quick and systematic simulations of heatsink for EMI.
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This article describes how CST MICROWAVE STUDIO® may be used for performing simulative tests of the immunity of devices to electrostatic discharge (ESD). A user defined input signal may be combined with an optimised model geometry to closely model the behaviour of a real ESD generator.
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In this article CST MICROWAVE STUDIO® (CST MWS) is applied to evaluate the radiated emissions due to a metallic enclosure when a loaded monopole antenna is located inside it. Good agreement with the measurements performed in a semi-anechoic chamber is obtained.
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This article concerns the application of CST MICROWAVE STUDIO® (CST MWS) to the simulation of electrically large automotive structures. CST MWS is ideal for such applications since the geometry can be easily imported and modified using the powerful user interface, the accurate and robust PERFECT BOUNDARY APPROXIMATION (PBA)® approximation is exploited, the linear scaling of memory with increasing mesh cells and the ability to simulate broadband in one single simulation. An example of an on-glass antenna simulation is also demonstrated highlighting the versatility of the CST MWS Transient solver.
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The aim of this article is to emphasize the application of a statistical approach to the analysis of the shielding properties of a real enclosure for radio communication equipment. A model of the enclosure was simulated with the CST MICROWAVE STUDIO® (CST MWS) Transient solver. Excellent agreement between simulation and measured was obtained.
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The shielding effectiveness (SE) of an enclosure has been simulated by using the CST MICROWAVE STUDIO® (CST MWS) and then compared to measurement from a known reference case.
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This article summarises the simulation of a System-in-Package (SiP) model using the CST MICROWAVE STUDIO® (CST MWS) Transient Solver to determine the S-Parameters, field distribution and system response when excited with 10 and 20 GHz pulses with additional noise signals. An analysis of the SiP with a board mounting and its effect on the is resonant frequency is also performed. The EMC behaviour of the SiP with and without the mounted board is also considered.
Permission and courtesy of AET Inc. Japan.
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This article examines the modelling of lightning strikes using CST MICROWAVE STUDIO® (CST MWS). The surface current distribution due to a double-exponential form lightning strike on the nose of an airplane is calculated by way of example.
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The coupled voltage at component level has been simulated using CST MWS for two PCB releases of the same Low Voltage Circuit Breaker (LV-CB) electronic control scheme. The results show a good agreement with actual measurements.
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This example shows the simulation of a conductor backed coplanar waveguide with a ground via fence for reducing EMI radiation. The excellent agreement between simulation and simulated results can be observed.
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This article demonstrates the simulatenous excitation of arbitrary waveforms at a number of different ports. A noise source in the form of a loop circuit is place above an IC package and the influence of the noise source on the transmission of differential signals in the IC feed tranmssion lines is investigated. Two frequency ranges were simulated, 1-10 GHz and 1-20 GHz. The simulations were carried out using the simultaneous excitation feature in CST MICROWAVE STUDIO® (CST MWS).
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Ms. Lis box: This shielding enclosure shows electromagnetic interference (EMI) from a slot, caused by the coupling of the internal source with cavity modes.
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