The Designer's Guide Community
Forum
Welcome, Guest. Please Login or Register. Please follow the Forum guidelines.
Jun 19th, 2019, 10:53am
Pages: 1
Send Topic Print
modulated s parameter analysis (Read 2516 times)
purplewolf
Senior Member
****
Offline



Posts: 103

modulated s parameter analysis
Dec 16th, 2016, 3:43am
 
Hello,
I was going through a paper of circulator and i found something which catched my attention. For simplicity, I beifly explain. They have designed a circulator and by modulation a varacter with a certain frequency then allow or block the signal passing through different ports in the circulator. The point which i dont get is how they do such a simulation with s-parameter. As far i know, s parameters can never ever incorporate different frequencies like in mixer.. (only harmonic balance or large singal analysis can do it)..Am i missing something..
So they turn on and off the modulation and see the effect on s parameters. In simulation hwo is it possible.. ??i just the paragraphd from their paper briefly.

'''Fig. 7 presents the -paramaters with and without mod-
ulation as obtained through full-wave simulations and the
coupled-mode (17). Simulations were performed by con-
sidering full SPICE models for the varactors and the filter
inductors, while inductors were modeled through a se-
ries combination of inductances and resistances'.

what does it mean?? can someone eleborate the type of s parameters they are referring??

waiting for urgent reply!
Back to top
 
 
View Profile   IP Logged
Andrew Beckett
Senior Fellow
******
Offline

Life, don't talk to
me about Life...

Posts: 1708
Bracknell, UK
Re: modulated s parameter analysis
Reply #1 - Dec 29th, 2016, 10:25am
 
Wouldn't it be better to give a reference to the full paper? Quoting a section out of context is rather hard to interpret what it means or even what you're asking...

Regards,

Andrew.
Back to top
 
 
View Profile WWW   IP Logged
purplewolf
Senior Member
****
Offline



Posts: 103

Re: modulated s parameter analysis
Reply #2 - Jan 14th, 2017, 11:26am
 
thanks for reply.

Its based on these related papers of new type of circulators..

Magnetless Microwave Circulators Based on Spatiotemporally Modulated Rings of Coupled Resonators   (MTT 11 January 2016)

Magnetic-free non-reciprocity based on staggered commutation (Nature)
Back to top
 
 
View Profile   IP Logged
purplewolf
Senior Member
****
Offline



Posts: 103

Re: modulated s parameter analysis
Reply #3 - Jan 15th, 2017, 12:55am
 
In summary...The circulator is essentially three LC series circuits connected at a common point. The capacitors of the LC series circuit are modulated by a 120 degrees phase shifted waveforms. This 'magical' modulation makes this three port circuit behave as circulator and I have no clue how to simulate modulated effect using s parameter as shown in paper...
Back to top
 
 
View Profile   IP Logged
Ken Kundert
Global Moderator
*****
Offline



Posts: 2168
Silicon Valley
Re: modulated s parameter analysis
Reply #4 - Jan 18th, 2017, 1:34am
 
Any kind of modulated system is a job for SpectreRF. If you want modulated S-parameters, consider using the Periodic S-Parameter (or PSP) analysis.

-Ken
Back to top
 
 
View Profile WWW   IP Logged
purplewolf
Senior Member
****
Offline



Posts: 103

Re: modulated s parameter analysis
Reply #5 - Jan 18th, 2017, 6:06am
 
Many Thanks Ken. I will share its working for the broader benefit of the community.
Back to top
 
 
View Profile   IP Logged
Pages: 1
Send Topic Print
Copyright 2002-2019 Designer’s Guide Consulting, Inc. Designer’s Guide® is a registered trademark of Designer’s Guide Consulting, Inc. All rights reserved. Send comments or questions to editor@designers-guide.org. Consider submitting a paper or model.