Coaxial Cable Simulation in Ansys HFSS

Hello everyone, this is Adel from Ozen Engineering and in this video I'll show you how to run a coaxial cable simulation in Ansys HFSS. We'll begin by creating the coaxial cable, starting with the inner conductor. So I'll draw a cylinder.

Here I'll set the center position to 0, 0, 0. For the radius, I'll create a variable, I'll call it conductorRadius, I'll set it to 1mm, and for the height, conductorHeight, and I'll set it to 30mm. Here I'll click apply, ok. So now we have our inner conductor.

Here if I double click on cylinder 1, we can rename it inner conductor. Here I'll change the material to copper, click OK. Here we can change the color, I'll choose orange, click apply and OK. Next we'll create the dielectric, so I'll draw a second cylinder.

Here we create another variable, dielectric radius, we set it to 3 mm and for the height, dielectric height, also 30 mm. Now let's double click on cylinder 1 and rename it dielectric. Here we'll create a new material, so click add material. I'll call it coax dielectric.

For the relative permittivity, 2.1 and for the loss tangent, 0.00022 and click OK. Now I would add an outer conductor with a thickness of 0.1 mm, so I'll draw a third cylinder. For the radius, we'll use the dielectric radius plus 0.1 mm and for the height, the dielectric height.

Now we'll select this object and the dielectric, then click subtract, check onto objects and click OK. Let's double click on cylinder 1 and rename it outer conductor. and let's change the material to aluminum. You can change the color and click OK. Now we have our coax cable.

Next step is to assign ports. So let's switch to face selection mode by pressing F on the keyboard. You can also right click, go to selection mode and select faces. Let's select the first end of the coaxial cable, and right click, go to Assign Excitation, Port, Waveport.

Here we'll define the integration line. Then click Next, and Finish. We'll do the same for the other end of the coax cable. So let's select this phase, right click, go to assign excitation, port, waveport, define the integration line, click next, and finish.

Now we have our ports defined under excitations in the project manager. Now let's add solution setup, so right click on analysis, add solution setup, advanced.

Here I'll set the frequency to 20 GHz and I'll reduce the maximum delta S to 0. 01. In the Advanced tab, check Set triangles for waveport and increase the minimum and maximum for finer mesh on the waveport.

For the frequency sweep we go from 1 GHz to 20 GHz and I increase the number of points to 451. Now we can run validation check and run the simulation by clicking analyze all. Once the simulation is complete, we can view the results.

So right click on results, create model solution data report, rectangular plot, and here I'll plot the S11 and S 21. So here you can see the return loss and insertion loss. Let's also plot the E-field. I'll switch to object selection mode by pressing O on the keyboard and select the dielectric.

Right click, go to plot fields, E, MagE, and click done. and here we have our E-field. To animate it, expand Feed Overlays, E-field, right click on MagE1 and click Animate. Here I click OK, Animate, and you can control the speed from here.

In this video we saw how to run a coaxial cable simulation in Ansys HFSS. Thanks for watching and please contact us at https://ozeninc.com/contact for more information.