Menu

Discussion Forum

New Discussion
Filtern

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Patch Antenna S11 Problem

Posted 30.06.2015, 04:55 GMT-4 RF & Microwave Engineering Version 4.4, Version 5.0, Version 5.1 5 Replies

Osman Sayginer
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Dear All,

I have been simulating very basic patch antennas. However when I compare simulations with measurements I always get very different plots (please see the attachment). Can it be about COMSOL's S11 Parameter or a plot scale problem? What would be reasons for that ?

Thanks in advance.

Attachments:

5 Replies Last Post 13.08.2016, 12:47 GMT-4
Osman Sayginer
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 06.07.2015, 04:41 GMT-4
No idea?
No idea?
Shakeeb Bin Hasan
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 06.07.2015, 15:55 GMT-4
Osman,

Unlike your measurement plots, the numerical results do not even look smooth enough. I suspect something went wrong in setting up your model.
Osman, Unlike your measurement plots, the numerical results do not even look smooth enough. I suspect something went wrong in setting up your model.
Osman Sayginer
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 21.07.2015, 03:27 GMT-4

Osman,

Unlike your measurement plots, the numerical results do not even look smooth enough. I suspect something went wrong in setting up your model.


Hi,

First of all thank you so much for your kind response.

The antenna that I am trying to simulate is a fabricated out of with special materials. It contains different material subdomains in it (Fig1). Actually I was suspecting with its material properties however after re-measurements I have found similar results that I assigned as a material. (diel1, diel2 and diel3).

What would be the problem you think?

Best regards.
[QUOTE] Osman, Unlike your measurement plots, the numerical results do not even look smooth enough. I suspect something went wrong in setting up your model. [/QUOTE] Hi, First of all thank you so much for your kind response. The antenna that I am trying to simulate is a fabricated out of with special materials. It contains different material subdomains in it (Fig1). Actually I was suspecting with its material properties however after re-measurements I have found similar results that I assigned as a material. (diel1, diel2 and diel3). What would be the problem you think? Best regards.
Hakan Nigar
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 9 years ago 13.08.2016, 12:25 GMT-4
Hi Osman,

I am also having the same problem; the S11data measurement from network analyzer it does not match with the simulation at all. Well, I use a waveguide microwave cavity instead of your patch antenna but the problem is the same.
So finally have you figured it out the problem?
Hi Osman, I am also having the same problem; the S11data measurement from network analyzer it does not match with the simulation at all. Well, I use a waveguide microwave cavity instead of your patch antenna but the problem is the same. So finally have you figured it out the problem?
Osman Sayginer
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 9 years ago 13.08.2016, 12:47 GMT-4
Hi Hakan,

The antenna that i was trying to simulate, had a high dielectric material and complex shape as you see. So later on I designed a very simple patch antenna with duroid substrate and results matched very well with the measurement.



Hi Hakan, The antenna that i was trying to simulate, had a high dielectric material and complex shape as you see. So later on I designed a very simple patch antenna with duroid substrate and results matched very well with the measurement.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content