6.1.8   Monitoring along specified line and versus time

QuickWave enables monitoring of the electromagnetic quantities along a specified line of FDTD cells and versus time, what has been mentioned in the above discussion. This monitoring is available through 1D displays. The horizontal axis of the display is determined via Domain option and depending on the choice the user is enabled to watch electromagnetic quantities:

·      along a line in space (so-called Space Domain)

·      versus time (so-called Time Domain)

·      along a pre-defined contour

The monitoring of electromagnetic quantities is available in 1D Fields window. The displays show the instantaneous amplitude values of chosen electromagnetic quantity but the envelope lines (time-maxima) can be also enabled. When domain is space, we usually want to construct the envelope (time-maxima) of the field at each considered point in space. However, when domain is time, usually only the time-history is of interest, and the external envelope lines do not provide any useful information.

First of the above enumerated options allows monitoring the instantaneous and time-maxima values of electromagnetic quantities along any line in the circuit, parallel to one of the coordinate axes. For example, if X-axis is selected, we further specify Y-coordinate and Z-coordinate of the line under investigation. These coordinates are introduced in FDTD cells, but their absolute position (in millimetres) is displayed in the Markers frame of 1D Fields window. The quantities that can be observed using this option are:

-         electric and magnetic field components

-         total electric and magnetic field

-         SAR

-         dissipated power, dissipated electric power, dissipated magnetic power

-         dissipated power density

-         temperature and enthalpy if QW-BHM is enabled

The application of this option is discussed in User Guide 3D: Rectangular waveguide filter example.

The second option enables watching the variation of the selected quantity versus time at a particular point of the circuit. The observation point is defined by its X-coordinate, Y-coordinate and Z-coordinate given in the FDTD cells, in 1D Fields window. For this feature it is possible to determine how many time samples will be displayed in the window showing the simulation results and many other advanced options in Position & Parameters dialogue. The quantities that can be observed using this option are:

-         electric and magnetic field components

-         total electric and magnetic field

-         electric and magnetic field intensity at Point Source/Probe/Lumped impedance element if it is present in the simulation project

-         voltage at Point Source/Probe/Lumped impedance element and current through Point Source/Probe/Lumped impedance element if it is present in the simulation project

-         SAR

-         dissipated power, dissipated electric power, dissipated magnetic power

-         dissipated power density

-         temperature and enthalpy if QW-BHM is enabled

Thermal components available in QW-BHM regime, temperature and enthalpy, are displayed versus the heating time, and not versus the electromagnetic (FDTD) time like the electromagnetic components.

The application of the 1D field monitoring versus time is discussed in User Guide 3D: A basic time domain reflectometry (TDR) example.

The last option enables watching the electromagnetic quantities along a pre-defined contour versus time. The advantage of this option is that the user determines the shape of the contour. To enable this option at least one contour (either E or H type contour) needs to be defined for the simulation project in the Input Interface. This feature is available in 1D Fields window and enables watching:

-         electric and/or magnetic field along the contours depending on the contours type set in the Input Interface

-         E-field and/or H-field integral along the contours depending on the contours type set in the Input Interface