Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Strange HFSS impedance smith chart

Status
Not open for further replies.
Z

zhangxs_08

Newbie level 4
Joined
Aug 14, 2018
Messages
5
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
30
Hi, I use HFSS to draw impedance smith chart and get a strange chart, from previous post somebody also meet with such problem and said it was due to |s11|>1, in my case I don't think so,because all my simulation projects show such strange chart... 无标题5.png
 

Plot S11 on a rectangular graph and you may get the answer.
 

vfone said:
Plot S11 on a rectangular graph and you may get the answer.
Click to expand...

Thanks, but I plot |s11| in dB and it is lower than 0 on the whole frequency band, I don't think it is |s11| that causes the problem, also all the projects that work well show the same problem, it maybe impossible they all go wrong...
 

Why do you think the impedance plot is strange? |S11| > 1 would refer to negative real impedance, it's obviously not the case here, impedance locus stays in right half plane.
 

But I hope to return to normal smith chart format...I don't know why the chart appears like that
 

So s11 is complete same as Zin for single port network...thanks very much
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top