5      Modelling

This chapter contains the description of configuration of I/O Ports, Absorbing Boundary Conditions, Wire, Near To Far Box and Fields Monitor Box.

QW-Modeller offers configuring the following excitation (source) types:

·        Transmission line port - matched modal excitation based on the field and impedance template.

·        Point source - lumped sources with user controlled available power or injected current and defined by its current and voltage at certain nodes.

·        Free space incident wave - available by using the auxiliary surface, so-called Plane Wave (PLW) Box simulation object.

QW-Modeller offers configuring the following load types:

·        Transmission line port - equivalent to transmission line source with excitation equal to zero.

·        Point probe - equivalent to point source with excitation equal to zero.

·        Lumped impedance element - inserted across one FDTD cell and described with one of the following RLC circuits: parallel, series, Drude, Debye, Lorentz.

Wire can be defined as a thin wire (of radius less than a cell size) parallel to any of the coordinate axes.

QuickWave allows for using two types of absorbing boundary conditions:

• Perfectly Matched Layer (PML) – defined as a PML Wall or PML Box.

• MUR with superabsorption – defined as a MUR Wall or MUR Box.

The NTF Box is necessary in the project if we want to calculate the radiation patterns of radiating structures or scattering patterns of scattering objects irradiated by a plane wave.

The Field Monitor Box enables performing time domain field monitoring in the circuit area limited by its dimensions.