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S-Parameters

I try to calculate S-Parameter for 2 antennas upper a cuboid. But I dont know why the result show constant value. Can you help me with my problem please?

I upload my model below. Thanks

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JIF

Hi

I think this is due to your incorrect use of PO. I'm running the model now with MLFMM to see what the results look like.

Altair Forum User

Okay thank you @JIF Im really appreciate it. One of my friend taught me how to use PO and that method is what I used in this model. If you gonna teach me how to use it correctly, it will be helpful

JIF

There is nothing wrong with PO, but you need to understand what the approximations are and how those approximations would affect your model. You want to use the approximations when they won't affect the results that you are interested in or won't affect it much. You don't want to use PO on your antenna (in this case) or close to the antenna. You can use it further away from the antenna where the approximations are valid.

Altair Forum User

Oh i see @JIF Thanks.

JIF

Below are the results (S11 and S12) with MLFMM.

Altair Forum User

Yeah yeah I've got pretty same result here @JIF when i used MLFMM. You know, you make my day. Now I kinda understand how this work, I used wrong method (for this case). But still, I cannot run my aircraft model with MLFMM. Maybe the problem is my laptop

<?xml version="1.0" encoding="UTF-8"?>

JIF

I'll take a look at the other model - I see you added a new one (old one was corrupted).

Altair Forum User

Thanks @JIF . I really appreciate it