6.14 NTF

The  command from Add section in  button in Model tab and I/O Ports->Near To Far->(Add) NTF... command from main menu invoke NTF dialogue for adding NTF box.

This dialogue can be also opened for adding or editing the ntf port from Near To Far dialogue.

NTF port (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 free space incident wave. Please note that for correct radiation pattern extraction, the NTF box must fully surround the structure and be itself surrounded by a homogeneous medium terminated with absorbing boundaries (except for symmetry and ground planes).

The NTF box name can be set in the Name field.

In the Geometry tab the user needs to define the dimensions of the NTF box. It can be done in two ways. First one is using Bounding Box Offset option, where the NTF box is drawn at the defined offset from the bounding box of the project structure. The offset is defined in project units for each direction and applies to each side from the structure.

Second solution is using Position option, where the user can choose Coordinates or Dimensions. While using Coordinates option the MinMax coordinates of the NTF box in each direction should be defined. For the Dimensions option, length, width, and height of the NTF box should be given together with the Min coordinates at which the box geometry starts.

Options available in Postprocessing tab, enable declaring NTF Postprocessing. In QuickWave the medium outside NTF box may be any isotropic dielectric. However, NTF box will not automatically recognise the medium parameters. They must be explicitly given in the NTF background medium frame.

It is advised to refer to Radiation and Scattering for more information.