Follow-up of the CST European User Conference 2014 Impedance meeting

New features of the 2014 release: mesh Mesh generation improved in CST 2014 (Re-engineering project):  New hexahedral/tetrahedral mesh as default (already introduces in CST 2013 as “hexahedral preview”). Always recommended!!  Meshing not based on fixpoints but on edges/faces called “Snapping planes”. They looks like thick grey lines in the mesh view.  Old hexahedral/tetrahedral mesh based on fixpoints is still a not default option named “Legacy”. They will not be available anymore for CST Legacy Default Fixpoint Snapping plane

New features of the 2014 release: mesh Advantages of the new mesher: Higher accuracy with a lower number of mesh cells. When performing dipolar simulation integration and charge location path will lay on a mesh line. Priority to the integration path. Always better have homogeneous meshes than increase the number!!  Uncheck “consider for snapping” in local mesh properties (analogy with the old “automesh fixpoints”) NB. Switch off snapping doesn’t work when the beam is shifted! x y x y DipolarQuadrupolar Wake integration path Source charge location Transient solver: Improved PBA per TLM hexahedral mesh, higher accuracy with a lower number of cells. NB. Suggested for meshing multilayers, with isotropic materials (gaskets for ex.)

New features of the CST 2014 frontend  Import new 3D CAD format  Solidworks, Solid Edge  New picks features for selecting an object  Pick blend, pick protrusion, pick depression  Selects view perspectives  Can be used command from keyboard (0 perspective, 5 front etc…)  3D fields on 2D plane  Possible to look at the field on different cutting plane in the same time  Improved materials fit

SAM approach: System Assembling and Modeling  In SAM the device is described by a schematic, a single block representing a parameterized 3D model.  A device can be represented simply by S-parameter behaviour or by an equivalent field source. Helps to reduce the computational effort required to study a complex model!  Always suggested for compare the results of different solvers  Minimize the time taken for the design and optimization of components, avoids multiple files.  The user can accesses SAM through CST DESIGN STUDIO (CST DS) interface:  Schematic  New task  Simulation project  Select the object  3D model  Create project

SAM approach: an example o Question from Carolina: I need to model a transmission line with a port that has no constant impedance, but the port impedance varies with frequency. Can I use an user defined table to define the port? o Answer: it can be done only in Design Studio!

1.Schematic  Block selection tree 2.Circuit elements  Sources/ports  External port 3.Drop and connect to the port to the schematic SAM approach: an example

4.Double click on the port  General  File based  Load the impedance vs. frequency file in Touchstone format

Conclusions New improved mesh generation in CST 2014 based on snapping planes. This mesh generation increase the accuracy and allow to reduce the number on cells! The “legacy” mesh generation is still an option but only for Many functions improved: please try again to fit your materials with CST 2014! Explore the new front end features to modify and visualize easier your projects. Design Studio is a very powerful tool: consider to use it more when you do optimization. CST is working on our problem about connection to external circuits with cable (to be implemented in Design Studio).