Opera-3d High Frequency EM Module
About the module
The Eigenvalue Solver
For eigenvalue problems, modelling re-entrant corners is crucial and special care has been taken to represent such features accurately. Although the module assumes all conducting walls are ideal conductors, users can obtain the surface current density distribution, as well as Q-factor calculations for practical materials. The post processor also displays the E and H fields associated with these resonant modes.
The Steady-State Solver
It solves the full Helmholtz equation, including loss and propagation terms, and the resulting complex solution can provide results at any time in the ac cycle (including time average and RMS quantities).
The module uses boundary conditions in three ways. Firstly, they provide a way of reducing the size of models by exploiting symmetry. Secondly, they approximate the field at large distances from the model (far-field boundaries). Thirdly, they may be used as driving terms. Options offered include:
• Absorbing boundary condition with user defined wave impedance.
• Incident and total electric field boundary condition.
• Current source boundary condition. The first of these provides field termination, and the other two may be used to excite a device. The absorbing boundary condition effectively absorbs all energy incident upon it and does not reflect the energy back into the system. In addition to these, surface impedance boundary conditions allows efficient modelling of material of high, but finite, conductivity. Users can deploy both high frequency simulation modules as stages in Opera-3d’s powerful multiphysics tools, allowing inclusion of thermal and structural effects.
Modeller and Post Processor
The Modeller allows users to create models, define material properties, set boundary conditions and excitations, create the mesh and launch the calculation. It allows the user to build models from primitive shapes using Boolean operations, or to import geometry from other CAD programs for which a range of I/O filters is available. Material data can be input by the user. The Opera- 3d automatic mesh generator has facilities for creating hexahedral, prism and tetrahedral meshes, requiring little or no user setting in many cases. However, it does include facilities to finely control the mesh when required.
Solutions are stored in a database that can be interrogated using the Post Processor. The post processor is renowned for its versatility in displaying computed results. It has very comprehensive and flexible facilities enabling results to be displayed in a variety of ways controlled by an easy to use ‘windows’ interface.
- RF cavities
- Microwave structures
- Oil exploration tools
- Remote sensing in undersea applications
- Full 3d modelling
- Automatic Mesh Generation
- Interfaces to CAD
- Steady-state or Eigenvalue analysis
- Generalized boundary conditions
- User defined functions
- Eigenvalue display as contours or vectors
- Graphs & histograms of the solution
- Results calculated on any surface
- Surface and volume integrals
- Q factor calculations
- Shunt impedance values
- Extendable Post-Processing