Wednesday, June 20, 2018

On the Road to Design Success with CST STUDIO SUITE : a new hands-on workshop series

From June 22-29, 2018 we will be traveling through Germany and Switzerland providing hands-on workshops using CST STUDIO SUITE®. We sat down with Dr. Matthias Tröscher to talk about what makes the On the Road workshops different and useful for our customers.

1. What was the motivation behind this series? What gaps were you trying to fill? 

We have offered traditional workshops with PowerPoint presentations and online demos as well as traditional trainings for EDA, MW&RF, EMC and other applications. We came up with our “On the Road” workshop series because we realized that there was interest in an easy-to-understand, timely, limited training with CST STUDIO SUITE®.

2. What makes this series different from our standard workshop series? 

We’ve moved away from our typical full-day workshop and introduced individual morning and afternoon sessions and attendees can choose between them or attend both.

There will be one dedicated example per session. In the morning, EMC, and afternoon, MW antenna design. The focus will be on having hands-on experience rather than listening to an instructor and watching a presentation.

3. What can users expect from these workshops?
These workshops will help attendees understand how electromagnetic simulation works and see how easy it is to run simulations with CST STUDIO SUITE®. They will run simulations in the time and frequency domains and couple 3D field simulation with network simulation. All of the do-it-yourself experiences will of course benefit from active support by CST experts.

Interested? Register here for a workshop near you. 

Dr. Matthias Tröscher 
Business Development Executive 
Transportation & Mobility 

Tuesday, June 19, 2018

A look back at EUC 2018

The 13th CST European User Conference (EUC) took place from June 4-6, 2018 at the INFINITY Hotel & Conference Resort Munich in Unterschleissheim.

EUC began on Monday with compact seminars on Electromagnetic-Thermal Co-Simulation, Antenna Installed Performance, Simulation Automation and Comparison of Measurement and Simulation on a Vector Network Analyzer. These seminars were very popular and provided a wealth of information in a short time, and were a welcome addition to EUC.There was also the opportunity to learn about strategy and innovation from Dassault Systèmes SIMULIA.

The official opening  of EUC took place on Tuesday morning with two keynote presentations. First, Prof. Claudio Paoloni, Head of the Engineering Department at Lancaster University, talked about the requirements of ever increasing data traffic to networks. His special focus is the development of cost-effective traveling wave tubes in the millimeter-wave range.

The second keynote, “A Coherent Lidar Utilizing Antenna Coupled MIM Sensors”, came from David Ben-Bassat, founder of Oryx Vision. Lidar, light detection and ranging, is a technology that provides information on the
environment of autonomous driving vehicles. In his presentation, he introduced Oryx Vision's approach to solving some of the typical challenges of Lidar technology.

The rest of the program included topics such as e-mobility, antennas for many applications, microwave components, the propagation of electromagnetic fields in the human body, as well as insights into current research and development activities. Presentations from EUC will be made available on our website.  To download them, users will simply need to set up a MyCST account.

Dr. Martin Timm
Marketing Director SIMULIA EMAG

Wednesday, June 13, 2018

New whitepaper: Designing a Compact Ridged Waveguide Filter

Designing a Compact Ridged Waveguide Filter

Multi-mode cavity filters offer high power handling and good performance as a compact device. Such filters are complex and sensitive to changes in the structure, meaning that their design can be time-consuming or even impossible with conventional methods. This article shows how the CST® filter synthesis tool Filter Designer 3D, part of the simulation software CST STUDIO SUITE®, can be used to design and tune a multi-mode compact ridged waveguide filter to meet stringent specifications.

The proliferation of mobile communication systems and protocols mean frequency spectrum
utilization is increasingly restricted – realizing the stringent channel specifications require high-performance band-pass filters. Satellite systems in particular are very exact in frequency, power, size and weight requirements: the filter response should produce steep cut-off to avoid channel interference and adhere to different standards, but size and space are typically restricted. Cavity filters are typically the preferred choice due to their power handling capabilities, but they are often bulky and heavy. Multi-mode cavity filters are therefore an attractive alternative. They use a number of modes in a single cavity, which significantly reduces the overall size. They also allow cross-couplings between cavities for a better filter response, which is not always possible for single mode resonators due to physical restrictions.

There are several simulation techniques that can be used in the tuning process of coupled-resonator filters. One traditional approach is to sequentially build up the filter by adding only one resonator at a time, while the group delay of the reflected signal is used as the figure of merit for the optimization. Another approach is to apply the inverse chirp Z-transformation to the reflected signal and from the transient response identify the individual detuned resonators and couplings. It is also possible to add additional ports to the full-wave simulation model and connect lumped components in a coupled schematic for space mapping[. All of these techniques typically involve using an equivalent circuit as a surrogate model where intermediate results can quickly be obtained as a reference during the process.

Friday, April 20, 2018

Announcing the 2017 YEP Award winners

The Yes! Education Program (YEP) Award, an initiative run by our partners AET Japan, grants an extended one-year license to universities that use CST software, in order to assist their research projects.

We spoke to this year's winners about their work and their experience with CST STUDIO SUITE the winners came from the National Defense Academy and the University of Yamanashi.

"A Linear Array Antenna of Microstrip Patch Antennas Fed by the Open-End of Coplanar Waveguides" by Toshihisa Kamei, Hiromi Shima, Syotaro Fukuda, Seishiro Ishii of the National Defense Academy 

Dr. Toshihisa Kamei
"It is our great pleasure that our recent paper [*] has been honored with the YEP Award. In this paper, we presented a 4-element linear array antenna using four 20 GHz band microstrip patch antennas. The signal is fed to the patch antennas from open-end coplanar waveguides without contact. We investigated factors related to the design of linear patch antenna arrays. Our group is working on communication, meteor burst communication systems, fundamental and
applied research of radio wave absorbers in the millimeter wave and microwave band from MHz to THz.
Our lab has been using CST for over 10 years. Based on the direct calculation along with realistic excitation ports and probes, we are able to model and investigate any novel structures on CST. CST STUDIO SUITE also serves as the best tool for our students to learn Maxwell’s equations and a common language. We believe that CST Software is very convenient for university education and research and allows quick testing of new and difficult ideas at a low cost.' - Dr. Toshihisa Kamei

[*] Toshihisa Kamei, Hiromi Shima, Syotaro fukuda, Seishiro Ishii

A Linear Array Antenna of Microstrip Patch Antennas Fed by the Open-End of Coplanar Waveguides, Pub. Date: April 14, 2017DOI:10.4236/wer.2017.820

“A Novel REBCO Wire Structure That Improves Coil Quality Factor in MHz Range and its Effect on Wireless Power Transfer Systems” by N. Sekiya and Y. Monjugawa of the University of Yamanashi

Dr. Sekiya's lab students
"We would be greatly honored to receive the CST YEP AWARD2017 for our published paper [*]. We also appreciate the cooperation between our lab students and CST support.

In this paper, we described the development and application of superconducting wire which realizes low losses at high frequencies. Conventional superconducting wire has no loss in direct current, but a high loss at high frequencies. That is why the application in this field has not developed. To solve this problem, we propose a new superconducting wire structure and investigate its effect through simulation and experimental verification.

Superconducting wire requires a substantial amount of time to calculate because they have a multilayer structure. As our lab had the small number of staff, we needed to proceed our research effectively. Under these circumstances, CST STUDIO SUITE helped us to proceed our research more efficiently. We will continue to use CST STUDIO SUITE to create innovative research." -Dr. Naoto Sekiya
Dr. Naoto Sekiya

[*] N. Sekiya and Y. Monjugawa, “A Novel REBCO Wire Structure That Improves Coil Quality Factor in MHz Range and its Effect on Wireless Power Transfer Systems”
Learn more about our academic programs here. 

Thursday, April 19, 2018

Featured whitepaper: Optical Materials in CST STUDIO SUITE

CST recently published a new whitepaper about simulating special optical materials in integrated components with CST STUDIO SUITE®. 

For many optical applications, materials are needed with anisotropic or nonlinear
properties. Two important examples of such properties are birefringence and dichroism.
Such materials exhibit different refractive indices and attenuation for orthogonal optical
polarization states. They are used to alter the polarization state of the light for example in
polarizers or polarization converters. A special case of a polarization dependent material
property is magneto-optical activity. Magneto-optical active materials can also be used to
alter the polarization state, but more importantly they can be used to build non-reciprocal
components like isolators. Further, the optical properties can not only depend on the state of
polarization but also on the electric field amplitude of the light wave. The optical properties
can depend on the second, third power or even higher powers of the electric field. Here,
the effects and applications are vast – amplification, frequency conversion, and all-optical
switching to name but a few.

To learn more, read "Optical Materials in CST STUDIO SUITE"

Wednesday, April 11, 2018

Submit to the CST University Publication Award

The deadline to submit your work for the CST University Publication Award is April 15, 2018. To honor the work that is done using CST STUDIO SUITE® at institutions around the world, we present the CST University Publication Award. Past awardees have pioneered breakthroughs in a wide range of fields. The winners' respective university institutes will recieve upgraded licenses for one year.

We recently published an interview with one of the 2017 winners about their breakthrough in filter design for satellite communications using CST STUDIO SUITE®You can see all of last year's winners here: 2017 University Publication Award Winners

Work published April 1, 2017 - March 31, 2018 can be submitted for our University Publication Award. The submission must be in English and should also state the place of publication. Only one paper per candidate will be considered so please limit your submissions to one paper.

Friday, April 6, 2018

NVIDIA Quadro GPU acceleration in CST STUDIO SUITE®

The high memory bandwidth and parallel processing abilities of GPU cards mean that GPU computing can provide significant simulation speed advantages over conventional CPU computing.  A series of comparative analyses were carried out to test the performance of NVIDIA’s Quadro GP100 and the brand new GV100 device, pictured below in Figure 1. These tests were performed using various models which represent typical applications that are simulated in the CST STUDIO SUITE® Time-Domain Solver.

Figure 1 - The NVIDIA Quadro GV100 features 5120 CUDA cores, 32GB of HBM2 memory, 7.4 TFLOPs double precision performance and a remarkable 900GB/s memory bandwidth, making it the fastest GPU device for simulation acceleration.

An initial study was done to compare the Quadro GP100 and Quadro GV100 against a high-end CPU model of the Intel Xeon Broadwell family. The CPU vs. GPU performance in Figure 2 shows that the NVIDIA Quadro devices can provide a significant speed-up to the Time-Domain Solver Loop*. On average, the latest GV100 model is shown to perform about 8 times faster than a high-end CPU; the performance of the GP100 model is not too far behind with an average speed-up factor around 7.

Figure 2  - The above plot represents the solver loop speed-up factor due to GPU computing, in reference to Dual Intel Xeon E5-2643 v4 CPUs with 12 physical cores, 3.4GHz clock, DDR4 2400MHz memory modules, on a Windows Server 2012 R2 system.

In another test, a direct comparison of the GP100 vs. GV100 was performed. The benchmark results shown in Figure 3 illustrate the GV100 performs about 20% faster than the GP100 device. This is in-line with what is expected, since the solver speed-up tends to be proportional to the difference in memory bandwidth of the GPU devices. The new Quadro GV100 device has an impressive memory bandwidth specification of 900GB/s vs. the GP100 at 732GB/s.

Figure 3 - The above plot represents the Solver Loop percentage speed-up (%) provided by the Quadro GV100 in reference to the Quadro GP100.

Along with high memory bandwidth and parallelization capabilities, NVIDIA Quadro GPU devices have many additional noteworthy features. For instance, select Quadro cards can be utilized for the CST STUDIO SUITE double-precision solvers due to their powerful performance capabilities in this aspect. The Quadro GP100 and GV100 cards have fast double-precision performance at 5.2TFLOPs and 7.4TFLOPS respectively. The new Quadro GV100 also provides a significant increase in GPU RAM at 32GB making it very suitable for larger and more demanding tasks, which have not been possible for single GPU devices thus far.

In parallel to their computational acceleration capabilities, Quadro series GPU cards can be utilized for their accelerated graphics capabilities; this means there is no requirement for an additional adapter. Quadro cards are specifically dedicated to CAD/CAE applications and well tested with CST STUDIO SUITE, making them the recommended option for display. They are also a particularly interesting option for those who are interested in a GPU dedicated for a workstation over a server-class system. Since these devices are actively cooled, they can be installed into a workstation chassis, which tends to be a more cost efficient option for simulations which can be solved within the resources of a single system.

NVIDIA just announced the release of the NVIDIA Quadro GV100 at the end of Q1 in 2018. This device is scheduled to be supported in CST STUDIO SUITE 2018 Service Pack 4 for the Time Domain solver. Full support of the GV100 for all GPU-empowered solvers will become available in the next major release. GPU-empowered solvers consist of: Transient FIT & TLM, Particle-in-Cell, Asymptotic, Integral-Equation, Multilayer and Conjugate Heat Transfer solvers. The NVIDIA Quadro GP100 device, which was also used in this study, has been fully supported since CST STUDIO SUITE 2017 Service Pack 2.

*Note that the solver loop time is not a representation of the total simulation time. The solver loop is the main, and most compute intensive phase of a time-domain simulation. The solver is the only phase of the simulation which takes advantage of GPU computation.

 Melissa Reis 
 Application Engineer
 CST of America