6.1.7    NTF

The Draw->NTF Box command from 2D Window menu indicates manual drawing of a NTF box inside a box consisting of absorbing walls.

We suggest alternative and more convenient way of introducing the ntf box using NTF dialogue and introducing the absorbing walls or box using ABC Wall or ABC Box dialogues.

It is used to create manually a virtual NTF box needed for antenna simulations and introduces absorbing boundaries around and sets the boundaries on which the Near-To-Far transformation will be executed for the purpose of calculating the radiation patterns.

The NTF box is being introduced on the current level and with the current height. To change current height and level settings please use Define Level dialogue.

To introduce a box we draw a rectangle. Click the left mouse button two times to mark its corners or by entering the coordinates from the Keyboard Entry dialogue. The box will be created at the current level, with current height and with the size in XY plane corresponding to the drawn rectangle.

The NTF boundary will be separated from the absorbing walls by 10 % of the size of the box.

After drawing the NTF box we can invoke Select Element command to see on the list seven new elements: six absorbing walls and the NTF box. Each of these elements can be edited or deleted like other elements. In particular, we can change the basic parameters of the NTF box through the Edit Special Plane, Boundary… dialogue and the basic parameters of absorbing walls through the Edit I/O Port dialogue.

We suggest alternative and more convenient way of introducing the NTF box using NTF dialogue or by using special NTF box generating UDOs available in the UDO library.

We suggest alternative and more convenient way of introducing the absorbing boundary condition using ABC Wall or ABC Box dialogues.

For more details regarding NTF box application refer to Radiation and Scattering.