SOPRANO is the high-frequency analysis program in
Opera-3d. It includes displacement current in the field equations
so that it can model devices whose size is significant in
comparison with the wavelength at operating frequencies.
SOPRANO/EV is an eigenfrequency analysis that will
find a specified number of modes for a given system above a given
frequency or those that lie within a specified frequency range.
SOPRANO/SS now includes various boundary
- Absorbing boundary condition with user-defined wave
- Surface impedance boundary condition.
- Incident and total electric field boundary conditions.
- Current source boundary condition.
The first of these provides field termination, whereas the last
two may be used to excite a device. Use of the surface impedance
boundary condition allows materials of high, but finite,
conductivity to be modelled efficiently.