1.5.3    Drawing the structure

At this stage we will be creating the project geometry. First step that needs to be accomplished is choosing the units that will describe the geometry. To do that we go to Model tab and from Units   button we choose Millimetres. The same can be done in the Basic tab in the Circuit Settings dialogue.

The dimensions of the transmission line are as follow:

To draw the structure we go to Geometry tab. We start from drawing the transmission line inside. Firstly, the part filled with air is drawn. We need to draw only the inside of the structure (the surrounding medium is metal), thus we start from the air block, which stands for the first part of the transmission line inside. To draw the transmission line we press Create a Box  button in the Primitives section and a dialogue appears.

From the Medium combo box we choose air. Now we can proceed to setting the dimensions of the air filled part according to the picture above. With Position set to (0,0,0) the transmission line will be drawn so that its lower right corner is placed at this coordinates. After pressing OK button the air filled part appears in the project.

Before drawing the concrete filled part it is required to define concrete medium in the project. For that purpose we press Media  button in the Geometry tab and in the appearing Project Media dialogue we press Add button.

In the Edit Medium dialogue we set the medium name to “concrete” and its relative permittivity to 4.5. Pressing OK button introduces the concrete medium to the project.

We now proceed to drawing the concrete filled part of the transmission line. We press Create a Box  button in the Primitives section and a dialogue appears.

The name of this part is set to “section2” and its medium is chosen to be concrete. The dimensions of this part are the same as in the case of air filled section. The concrete filled part is placed behind the section1 thus its position in X direction is set to 100 mm. After pressing OK button the concrete filled part of the transmission line appears in the project.

Previous step: Defining the type of the structure and background medium.

Next step: Drawing the ports.