How to calculate SAR for an implanted antenna in a medium

User: "Clyraeason"
Altair Community Member

I'm a beginner with FEKO, and I'm trying to figure out how to calculate SAR for an implanted antenna in a human medium. I've placed a dipole antenna inside a cylindrical body like this. From my simulation results, the near-field SAR distribution and the peak spatial-average SAR are different by several orders of magnitude. However, when I take the antenna out and simulate it in free space, both results are roughly the same.

Also,should the antenna surface be covered with a dielectric layer in this kind of simulation?

image.png

 

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    Hi @Clyraeason ,

    Could you please attach your model? And also let me know which version you're using?

    Best regards,
    Torben

    User: "Clyraeason"
    Altair Community Member
    OP

    I've attached my model and would appreciate it if you could review it. I'd like to confirm whether I've used the correct settings for calculating in-body SAR.

    my version is v2019.3.2

    User: "Torben Voigt"
    Altair Employee
    Accepted Answer

    Hi Clyraeason,

    of course I can't use Feko 2019, but I have looked at your model in Feko 2025. If the antenna is in the medium, I think there is a problem: the near field is calculated very close to the wire of the antenna and especially very close to the feed. This results in extremely large values for the spatiel-peak SAR calculation. As you probably know, the solver performs a search of the entire medium to find the position of the maximum spatial-peak SAR. This is directly at the feed.

    I would therefore recommend either positioning the antenna outside or enlarging the freespace region so that the SAR is not calculated directly at the location of the feed.

    image.png

    Best regards,
    Torben