Friday, March 16, 2018

Success story: Drayson Technologies Develops Innovative Energy Harvesting Technology with CST STUDIO SUITE

The CleanSpace Tag monitors air pollution and includes
Freevolt RF Energy Harvesting technology.
When Drayson Technologies were working on a compact smart sensor for monitoring air pollution incorporating Freevolt™ RF energy harvesting, Drayson's proprietary wireless charging technology, they looked to CST STUDIO SUITE® to help solve a tough electromagnetic challenge. 

The challenge: recharge the battery of an IOT sensor device. What resulted was a device that can harvest RF energy when sufficient RF power density is available. Check out the success story on our website for all the details.

“CST offers Complete Technology for simulation, with all its different solvers in one user interface. This meant that we were able to use the best solver for each application: for example, the Time Domain Solver for high-frequency simulations such as designing CleanSpace tag or the Bluetooth antenna, but easily transfer to the Frequency Domain Solver for low-frequency simulations of inductive power transfer. GPU acceleration made it possible to simulate the entire tag efficiently, speeding up simulation time and saving money.” 
-Drayson Technologies 

Read the full success story here


Wednesday, March 14, 2018

A breakthrough in filter design for satellite communications using CST STUDIO SUITE®

In December, we announced the winners of our CST University Publication Award. Every year, we select three papers and one short paper to honor and we are excited to share some of the details behind the winning research. We spoke to Dr. Miguel Laso to learn more about his team's award winning paper, “Chirping Techniques to Maximize the Power-Handling Capability of Harmonic Waveguide Low-Pass Filters.”

CST: What is the challenge that this new filter method addresses? 

Dr. Laso: The filter in this paper is the result of a multi-year collaboration between TESAT Spacecom GmbH and the Microwave Components Group at UPNA in the framework of several contracts and ESA projects. TESAT and UPNA have successfully developed a new standard of  output lowpass filter for the communications satellite payload, which withstands the combined power of all the satellite channels and cleans all the channel signals at the same time from spurious responses. This avoids the use of many individual low-pass filters, one per channel, as it is usually done now. In this paper, we surpassed our previous results, getting a filter to handle more than 100 kW, while the equivalent classical waffle-iron filter handles only 0.15 kW (!!!) before the multipactor effect appears and ruins communication.

How does this chirping technique help engineers improve their filter designs? 

Currently, although very good high-power analysis tools such as SPARK3D or CST PARTICLE STUDIO® exist, the space industry usually conducts also a costly testing campaign of the satellite parts before they are launched into space to check that everything works fine. The European Cooperation for Space Standardization (ECSS) - Multipaction design and test- is the document that the industry uses to conduct such testing campaigns. Getting such high-power handling capability, such as 100 kW in an analysis, theoretically avoids the use of this “just-in-case” testing to check whether the filter will withstand the conditions in a real working situation in space. This saves a lot of time and budget. According to the current ECSS document, the filter in the paper should handle at least 70 kW in simulation for testing to be considered unnecessary. We easily get more than 100 kW.

EM fields inside the filter using CST STUDIO SUITE. Image courtesy of Dr. Miguel Laso.

How did you use FEST3D in your research project? 

FEST3D is the ideal tool to simulate such kind of devices based on the concatenation of waveguide sections, and we can obtain the S-parameters of the filter very quickly and reliably. FEST3D also allows us to optimize the device very easily. Finally, FEST3D is also used to check the filter behavior for multimode excitation.

How did you use CST STUDIO SUITE®? 

In the paper, CST MICROWAVE STUDIO® (CST MWS), part of CST STUDIO SUITE®, is used to see the fields inside the filter. This allows us to adjust several of the most important filter parameters, such as the minimum mechanical gap, the waveguide length between the filter elements, and the length of the elements themselves, to maximize the filter power-handling capability. The power-handling was checked with SPARK3D, where we used the fields previously calculated. We also make use of CST MWS to include in the design phenomena such as the milling rounding, wall tilting, and several other imperfections that we have in the real world when the part is milled at the workshop. CST STUDIO SUITE® has also been used by our research group to simulate the frequency response of passive devices with unconventional non-step-shaped profiles, such as smooth or continuous profiles, a flagship of our research outcomes and papers for many years.

More generally, has the CST academic license and the CST University Publication Award helped your team? 
A lot, not only to simulate the sometimes “strange” devices that we imagine or which result from our design techniques but also to train our younger undergraduate students in class or at the doctoral level in the design of satellite components. The CST University Publication Award confirms that we are taking full advantage of the CST tools and it is an incentive for us to continue exploring their possibilities.

What’s next for you – are you working on this technique further? 

We have been working on this idea for years and have applied it to several scenarios. We recently successfully closed an ESA project on its use for future Ka-band multibeam payloads. Although the improvement of a novel concept is endless, we believe that the idea is already very mature and it is being used by TESAT, which is also the current owner of the patent. More generally, we will continue working on microwave filters and passive devices in the future, particularly for space applications. As an example of our current interests, we are currently working hard on a new design method for bandpass filters for the future high-capacity Q/V/W –bands and above (this is a Ph.D. thesis co-funded by ESA). We have already reported very good results in combining excellent frequency behavior, power-handling, and fabrication easiness, the latter using the same milling tolerances employed at the workshop for lower (Ku/Ka) frequency bands.

Is there anything else you would like to mention? 

We thank the CST family for their support. We believe we were one of your first clients in Europe many years ago and you have been a part of many of our research papers ever since. We feel honoured that you have considered our work as an outstanding good practice example for the community.

The team that authored this paper at Universidad Publica de Navarra consisted of Fernando Teberio, Ivan Arregui, Adrian Gomez-Torrent, Israel Arnedo, Magdalena Chudzik, Michael Zedler, Franz-Josef Görtz, Rolf Jost, Txema Lopetegi, and Miguel A. G. Laso.

The research team at Universidad Publica de Navarra. Photo courtesy of Dr. Miguel Laso.

Tuesday, March 6, 2018

Call for contributions: CST SIMULIA EUC 2018

We are in full gear preparing for one of the highlights of the CST year, our annual European User Conference (EUC) and we are looking forward to seeing our users' presentation submissions. There’s nothing quite like the intellectual energy that comes from so many of our customers coming together to share their work, their ideas and to discuss the bright future of simulation.

Customer contributions are crucial to the success of this conference and EUC provides a valuable opportunity to share your knowledge and advance the collective expertise of CST users.
To contribute a presentation, please submit an abstract of between 100-200 words by registering and submitting your abstract online.

For contributors with an accepted presentation who hold a valid CST maintenance contract, the registration fee will be waived. To qualify for this discount, the final abstract must be received by March 15, 2018, and the finished presentation by April 30, 2018. See our website for full details

Still not sure? Hear what people have to say about the EUC experience.

"We have the chance to meet with different companies who are working closely together with electronic products and simulation and I think there is a big benefit for all the people here who attend these sessions, learn new things and learn what is coming in the future." - Damien Kirscher, Altium 

“I think that, being a CST user, this conference puts you in contact with the biggest experts in EM simulation so that you can really take advantage of this during the conference. Also, for those attendees coming from the academic sector, being in contact with people from the industry is always a good opportunity. Likewise, the industry-related attendees can also see the latest advances in design and simulation from some of the most relevant research groups.”
 - Carlos Vicente, Aurorasat 

 "I have attended CST EUC several times and for me, each one is an exciting event. I get to see the software from the user's perspectives. and then develop our own methods and see where we still have empty areas where we should research further. Furthermore, I know many people here who I work very well with and remain in contact with and I'm looking forward to attending again." - Markus Clemens, Bergische Universität Wuppertal

“In my experience EUC is a great opportunity to learn, share and interact with experts in various application areas. It is the ideal place to discuss your ideas and see what other CST users are doing. This event will certainly enrich your simulation experience and hopefully also help you to improve your workflows in the future.” - Theunis Beukman, CST

"The support room is really interesting because I use it to pose my questions. With face-to-face communication it's easier to find solutions." - Tatiana Rijoff, CERN 

We look forward to seeing you in June!

Friday, March 2, 2018

Featured Whitepaper: Efficient Design Layout and Simulation of Integrated Photonic Circuits Using IPKISS and CST STUDIO SUITE

CST and Luceda have been working in partnership since 2016 to make make layout, physical simulation and circuit simulation of optical components easily available within a single framework  Recently, we published a whitepaper that explores photonic circuit simulation using the automated link between IPKISS and CST STUDIO SUITE®. 

Read the full paper here

3D electromagnetic field simulations are a very important aspect of integrated photonics design, describing component behavior when validated models obtained through measurements are unavailable or unreliable. In practice, designers often have to consult a range of sources and people to get their simulation configured properly. As those sources are continuously updated, ensuring that the EM simulations are consistently correct is mostly an organizational challenge. Pressed by tape-out deadlines, design teams often have to manually regenerate their models for every slight change of the component or process. The automated link between IPKISS and CST STUDIO SUITE® gives photonic circuit designers direct access to FDTD or FEM generated circuit models using the validated simulation settings set by device engineers. This ensures that models used by circuit designers can easily be regenerated with validated CST STUDIO SUITE simulation settings. This way, IPKISS keeps models up to date as the component layout, fabrication processes, operating conditions and material models evolve from design to design. In this paper, the IPKISS-CST STUDIO SUITE link is introduced and its use is exemplified in a design of a glucose sensor.