jkyriac
Newbie level 3
Hey guys, new here hope we can get along. I'm doing my theses on hyperthermia and was hoping you could help me. I'm designing an antenna on ads momentum, that has a superstrate
Here's a picture of the antenna
![!2.jpg !2.jpg](https://www.edaboard.com/data/attachments/30/30159-04832fd8ef80f69b8fa2712d3c6b7f80.jpg)
here is what the layout looks like and their properties
here's the mesh I'm using
![!3.jpg !3.jpg](https://www.edaboard.com/data/attachments/30/30161-29c2904a847b5d30d7a530fe6d9ddb39.jpg)
The mesh is pretty dense so as not to have convergence problems and i didn't so far, but when i changed my antenna to alter its resonance frequency and changed the frequency range to be able to see it, momentum wouldn't converge (i think, it said "S parameters show unphysical values for certain frequencies")
I'm not entirely new to momentum I've designed antennas on it before, anyway can anyone help me out. [I read a post where someone had convergence problems with his transmission line and other people told him to check the transmission line mesh, what's it do?]
Thanks in advance
Here's a picture of the antenna
![!2.jpg !2.jpg](https://www.edaboard.com/data/attachments/30/30159-04832fd8ef80f69b8fa2712d3c6b7f80.jpg)
here is what the layout looks like and their properties
layout | thickness(mm) | Er | tand | Mur | tand |
freespace | |||||
----------- | |||||
superstrate | 10 | 60 | 0.0018 | 1 | 0 |
------- -STRIP - cond | |||||
substrate | 3.18 | 2.32 | 0.0012 | 1 | 0 |
////gnd//// |
here's the mesh I'm using
![!3.jpg !3.jpg](https://www.edaboard.com/data/attachments/30/30161-29c2904a847b5d30d7a530fe6d9ddb39.jpg)
The mesh is pretty dense so as not to have convergence problems and i didn't so far, but when i changed my antenna to alter its resonance frequency and changed the frequency range to be able to see it, momentum wouldn't converge (i think, it said "S parameters show unphysical values for certain frequencies")
I'm not entirely new to momentum I've designed antennas on it before, anyway can anyone help me out. [I read a post where someone had convergence problems with his transmission line and other people told him to check the transmission line mesh, what's it do?]
Thanks in advance
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