Problem with cable port/load insertion in cable schematics

Luca Lisboa

Hello,

I'm currently working on a EMC simulation using Feko MTL/Cables simulations. The system must account for the presence of a LISN device, upon which a voltage is supposed to be read through the a load present at a cable port at the adequate place in the circuit. The circuit is currently configured as such:

** Note that I'm only interested in reading the voltage at Pin_L1. Pin_N does not need to be evaluated **

There's a 50 ohm load at the port VL, as expected:

In theory, I see no reason as to why this shouldn't work. However, upon saving the model before running the solver, the software crashes and presents the following messages:

Unfortunately, I can't seem to understand the error message and the problem with the schematic. I'm particularly frustrated because a regular 50 ohm resistor could be used instead of the loaded cable port, but that would make my analysis much more complicated since probed voltages/currents in circuit elements do not get stored as stored sweep data in the paramatric sweep application macro - which I intend to make use of.

Could anyone please indicate why this error occurs and, naturally, how to solve it?

Thanks for your attention!

Jaehoon

Hello Luca,

Please add a 50 ohm to the cable schematic directly, instead of using the cable port.

(And activate a current or voltage probe in the 50 ohm to check the quantity.)

It looks like there is an error when using the cable port for an external load.

Regards,

Jaehoon

Luca Lisboa

Hello Jaehoon,

The problem with adding a 50 ohm resistor with a probe directly to the schematic is that, once I run a parametric sweep, the voltage across the load does not get stored as a sweep in Post Feko. A "true" load inside a port does not have that problem, since it gets stored as such (just an example from another sim.):

This makes my job much easier, since I would have access to each voltage reading across the load for each value combination of the parametric sweep variables. Here's another example for that:

The reading of a voltage probe, however, does not get stored like this, and I would have to manually insert each one of the parametric sweep models and their respective voltage reading one by one. That would be quite time consuming and prone to mistakes.

Is there a way to solve this problem?

By the way, thank you for your reply!

Jaehoon

Let me ask a request for more investigation.

"Could you share your Feko model here or send to jaehoon@altair.com and explain what you'd like to change with the parameter sweep macro?"

Regards,

Jaehoon

Luca Lisboa

Hello Jaehoon,

I will do just that by e-mail.

Best regards,

Luca