How can I create the loop of a circular loop antenna?

[drkirkby]

I want to model a loop antenna, but are not sure how to draw the loop. I have seen this done in the past, and if I recall correctly, a circle is drawn, and then that swept along a arc. But I can't seem to find out / recall how to do it.

I did think of drawing a torus, then chopping a bit out by drawing a box over the torus, and doing a subtraction. So essentially putting a cut through the torus.

Any ideas? I have access to HFSS 14.

I'm guessing driven model with a lumped port is optimal. I say that, as that is what is used on a dipole in the HFSS antenna design tool. This seems pretty close to that sort of thing.

 

[Ata_sa16]

try this:
https://www.youtube.com/watch?v=yWftIKlIB8c

but its better to download and install Maxwell 14.0 for this purpose.

Once I did and I simulated my design. However, when I fabricated it, the result was different than that I obtained in simulation. (

So after weeks trying and searching about it, I concluded that I cannot trust these simulations.

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https://www.edaboard.com/threads/352576/

 

[drkirkby]

I believe you misunderstood me - note I mentioned the word "torus"

https://en.wikipedia.org/wiki/Torus

I want a loop like a torus, but with a gap - see image. I'm looking for something to fabricate out of copper pipe, not something on a PCB.

I simulated that with a circumference of 1.0 m, and 10 mm diameter tube (I used a perfect electrical conductor for the simulation. The resonate frequency is around 130 MHz, but varies as I change the solution frequency even slightly, so I'm not entirely trusting of the results of the simulation. The problem with a lot of EM simulation software is that it is easy to make a mistake, and those mistakes are far from obvious.

• Create a document in OpenOffice, and you see if the text looks right or not.
• Edit a photo in Gimp, and you can see if it looks right.
• Perform an EM simulation in HFSS, and it is far from obvious if the results are correct or junk.

What I done there was

1. Draw a torus
2. Draw a box that overlapped the torus
3. Performed a subtration using Boolean -> Subtract.

I don't believe however a torus is the right way to do this - I think a circle should be swept around an arc of 340 degrees or so. Therefore the loop has a gap. I just don't know how to set it up.

 

[Ata_sa16]

I made u this tutorial, I hope it helps you.



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Here you can change angle:

 

[Azulykit]

A torus works. A circle rotated about an axis works. The rotated circle can have some interesting effects if you make the angle of rotation a parameter and then pick the wrong angle. Keep an eye on the resulting model.