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Loop antenna

Posted Jan 27, 2018, 8:47 a.m. EST Electromagnetics, Low-Frequency Electromagnetics, RF & Microwave Engineering 4 Replies

Marek Kaniński
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Hi I want to simulate a simple loop antenna which is made of copper. In this case I modelled a torus (360 deg), but I don't have any idea how to excite it. When I try adding port only errors occur. I will be grateful for any help.

4 Replies Last Post Feb 2, 2018, 7:35 a.m. EST
Robert Koslover Certified Consultant
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Posted: 7 years ago Jan 27, 2018, 11:54 p.m. EST

Cut a thin piece out of the loop and put a lumped element port there, with the direction of the imposed current (or voltage) from one side of the cut to the other. The "height" is the length of your cut segment, the "width" is 2* pi*r, where r is the small radius (i.e., of the wire, not of the overall loop).

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Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
Cut a thin piece out of the loop and put a lumped element port there, with the direction of the imposed current (or voltage) from one side of the cut to the other. The "height" is the length of your cut segment, the "width" is 2* pi*r, where r is the small radius (i.e., of the wire, not of the overall loop).
Marek Kaniński
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Posted: 7 years ago Jan 28, 2018, 1:07 p.m. EST

Could you please show me how to do that? I am trying but the effect is disappointing.

Could you please show me how to do that? I am trying but the effect is disappointing.
Robert Koslover Certified Consultant
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Posted: 7 years ago Jan 30, 2018, 12:04 a.m. EST

I encourage you to post your file to this forum. Then, I or others can look at it and one of us may tell you what is wrong.

-------------------
Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
I encourage you to post your file to this forum. Then, I or others can look at it and one of us may tell you what is wrong.
Sherry
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Posted: 7 years ago Feb 2, 2018, 7:35 a.m. EST

Hi

I have the similar issue. I've modelled a loop antenna and when I excite it with lumped port, I receive different S11 result in comparison to CST. Both works at the same frequency but in COMSOL I see mismatch in my design. in CST: @ 2.4 GHz ---> S11=-30 dB In COMSOL: @ 2.4 GHz ---> S11=-15 dB

Can anyone help me?

Thanks

Hi I have the similar issue. I've modelled a loop antenna and when I excite it with lumped port, I receive different S11 result in comparison to CST. Both works at the same frequency but in COMSOL I see mismatch in my design. in CST: @ 2.4 GHz ---> S11=-30 dB In COMSOL: @ 2.4 GHz ---> S11=-15 dB Can anyone help me? Thanks

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