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Muth F.,CST Computer Simulation Technology AG | Schneider H.,CST Computer Simulation Technology AG | Euler T.,CST Computer Simulation Technology AG
Lecture Notes in Computational Science and Engineering | Year: 2017

For the simulation of complex models and complete systems whose components involve different electromagnetic scales and properties, it is often appropriate to apply domain decomposition methods. Based on the surface equivalence principle, the aim of the presented project is to develop a modular, black box framework for domain decomposition which is capable of assigning any formulation and numerical method to a certain subdomain. In this approach, equivalent surface currents act as interface between the subdomains exchanging boundary data. Here, the focus is on coupling finite element and boundary element frequency domain methods driven by application examples like antenna placement. First results and encountered challenges will be presented. © Springer International Publishing AG 2017.

Agency: European Commission | Branch: FP7 | Program: MC-ITN | Phase: FP7-PEOPLE-2011-ITN | Award Amount: 5.94M | Year: 2011

There are more than fifteen thousand particle accelerators in the world, ranging from the linear accelerators used for cancer therapy in modern hospitals to the giant atom-smashers at international particle physics laboratories used to unlock the secrets of creation. For many decades these scientific instruments have formed one of the main pillars of modern research across scientific disciplines and countries. The optimization of the performance of any particle accelerator critically depends on an in-depth understanding of the beam dynamics in the machine, the availability of simulation tools to study and continuously improve all accelerator components from beam handling elements to rf cavities, a complete set of beam diagnostics methods to monitor all important machine and beam parameters with high precision, and a control and data acquisition system that links all the above. The oPAC consortium proposes to carry out collaborative research into all the above aspects, with the aim to optimize the performance of present and future accelerators that lie at the heart of many research infrastructures. The network brings together leading research centers, universities, and industry partners to jointly train the next generation of researchers in this interdisciplinary field. oPAC aims at developing long term collaboration and links between the involved teams across sectors and disciplinary boundaries and to thus help defining improved research and training standards in this important field.

Alber I.,Helmholtz Center for Heavy Ion Research | Sigle W.,Stuttgart Center for Electronic Microscopy | Demming-Janssen F.,CST Computer Simulation Technology AG | Neumann R.,Helmholtz Center for Heavy Ion Research | And 4 more authors.
ACS Nano | Year: 2012

We report on the experimental and the theoretical investigation of multipole surface plasmon resonances in metal nanowires conductively connected by small junctions. The influence of a conductive junction on the resonance energies of nanowire dimers was simulated using the finite element method based software CST Microwave Studio and experimentally measured by electron energy-loss spectroscopy in a transmission electron microscope. We extend the analysis of conductively connected structures to higher order multipole modes up to third order, including dark modes. Our results reveal that an increase in junction size does not shift significantly the antibonding modes, but causes a strong blue shift of the bonding modes, leading to an energetic rearrangement of the modes compared to those of a capacitively coupled dimer with similar dimensions. © 2012 American Chemical Society.

Agency: European Commission | Branch: FP7 | Program: CP-IP | Phase: AAT-2007-3.5-02 | Award Amount: 26.46M | Year: 2008

The HIRF SE research project has the goal of providing the aeronautics industry with a framework which can be used during the development phase to mitigate the EM aspects. In addition it will provide a considerable reduction in the certification/qualification tests required on air vehicle. The HIRF SE main objectives can be summarized by the two followings items: Full validated and integrated solutions to model, to simulate numerically and to test air vehicles for EM aspects during design and certification; To build (from past and ongoing works) an integrated approach with an open and evolutionary architecture. The HIRF Synthetic Environment expected results can be summarized by the following items: Capability to deal with the increased use of composite materials and structures by the airframe industry. The HIRF SE framework will include the most advanced computational models for the numerical simulation of the EM characteristics and performance of composite materials. Capability to deal with the complete internal and external electromagnetic environment (present and foreseen). The HIRF SE tool will be able to simulate a wide spread typology and number of EM (internal and external) interference sources. To take advantage of a large community to develop and issue a work on modelling of excellence. The result will be to develop and issue a work of excellence on EM modelling by gathering a large team of scientists, academic and industrial engineers, cooperating to build a reference tool of their own. A developed methodology/tool well recognized inside the civil aviation community in accordance with certification bodies. Taking into account the HIRF Synthetic Environment main objectives and the following expected results it is possible to affirm the HIRF SE project addresses the scope of work described in the FP7 Work Programme.

Kunze M.,CST Computer Simulation Technology AG
IEEE MTT-S International Microwave Symposium Digest | Year: 2011

Surface impedance boundary conditions (SIBC) for superconductor layers are provided. These can be used for arbitrary thick conductors from very thin to very thick. A superconducting layer is considered as a TEM transmission line so that the SIBCs can be obtained as the input impedances of an open ended and a short circuited transmission line, respectively. The SIBCs are verified for a microstrip line and a coplanar waveguide made of Niobium on a LaAlO3 substrate. © 2011 IEEE.

Kunze M.,CST Computer Simulation Technology AG
2011 German Microwave Conference, GeMiC 2011 - Proceedings | Year: 2011

Surface impedance boundary conditions (SIBC) for lossy metal layers are presented that are not limited to the frequency range in which a metal layer is thicker than several skin depth. A metal layer is considered as a TEM transmission line so that the SIBCs can be obtained as the input impedances of an open ended and a short circuited transmission line, respectively. The SIBCs are verified for a MMIC microstrip line and a coplanar waveguide. © 2011 Institut fur Mikrowellen.

Boehmer S.,RWTH Aachen | Lange E.,CST Computer Simulation Technology AG | Hameyer K.,RWTH Aachen
IEEE Transactions on Magnetics | Year: 2013

This paper discusses non-conforming sliding interfaces for motion in combination with a magnetic scalar potential formulation. Lagrange multiplier are used to implement the relative motion of stator and rotor. The utilization of the specific Lagrange multiplier approach implies the application of a magnetic scalar potential formulation in 3D Finite Element (FE) modeling of electrical machines because up to the present a canonical definition of biorthogonal basis functions for the magnetic vector potential is not available. © 1965-2012 IEEE.

Thoma P.,CST Computer Simulation Technology AG
Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011 | Year: 2011

This paper outlines a process as it is commonly being used for developing commercial electromagnetic simulation tools. Special emphasis is taken on how research fits into this process and in particular on the importance of cooperations between tool vendors and research institutions. Some examples for successful cooperation projects are given to illustrate different possible types of cooperation models. © 2011 EurAAP.

Vrba J.,Czech Technical University | Jansen R.H.,RWTH Aachen | Diewald A.,IEE S.A. | Baum G.,CST Computer Simulation Technology AG
Journal of Electromagnetic Waves and Applications | Year: 2012

Radiation into free-space and coupling to substrate modes, caused by via holes, are investigated with the goal to expand via hole models in microstrip circuits by radiation effects. © 2012 Taylor & Francis.

A method, a device and a computer program product for determining an electromagnetic near-field of a field excitation source of an electrical system are provided, in particular for analysis and/or optimization of an antenna radiation, of a cross-talk problem, of a signal reflexion/transmission, of a stray field, of an irradiation problem or the like. The method includes defining electrical and magnetic properties of the material distribution of the system, defining at least one field excitation source, and determining the electromagnetic near-field components within at least one and in particular all partitions by solution of the Maxwells equations of the near-field, where each near-field component of each partition can be represented by a linear position of M predetermined ansatz functions P_(i )orthogonal to one another with regard to a scalar product and weighted with field coefficients v_(i), and the spatial and/or time derivative of the near-field component can be determined as a linear position of these ansatz functions P_(i )weighted with derivative coefficients w_(i), and where each coefficient w_(i )can be determined from a quantity of previously determined field coefficients v_(i )and derivative coefficients w_(i), so that the determination effort of the near-field of the system rises in substantially linear manner to the number N of partitions in the domain under consideration and to the number M of ansatz functions P_(i )used in the linear position.

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