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

Coplanar Waveguide (CPW) Simulation in ADS

Status
Not open for further replies.
A

Amir4008

Newbie level 1
Joined
Feb 8, 2016
Messages
1
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
15
Hi

I am trying to simulate a simple CPW in ADS momentum. I have used the differential port setup as shown in the attached image. I have also attached my substrate configuration. The simulation is giving me the following warnings:

WARNING

S-parameter results show unphysical behavior for certain frequencies.
Cause : - inaccurate (high frequency) calibration ;
- electrically large via using lumped model ;
- higher order modes at the ports ;
- slot mode at coplanar ports ;
- grouped strip-slot ports ;
- mesh density is too coarse.
and the results are strange as demonstrated in my attached image. I have also attached my workplace file.

Will be delighted if someone can help me with that.
 

Attachments

  • 1.jpg
    1.jpg
    498.5 KB · Views: 511
  • 2.jpg
    2.jpg
    443.4 KB · Views: 794
  • 3.jpg
    3.jpg
    313.4 KB · Views: 546
  • Coplannar_wrk.zip
    1.6 MB · Views: 110

Look at the currents at the frequencies where S-parameters are strange/unphysical. If the currents look physically correct, the problem must be from port calibration failure.
 

This is a strange problem that I also have encountered few times. Other than the advice that Dr. Volker gave you on the above, try to reduce (yes, reduce!) the mesh. This worked for me for a 60 GHz power combiner.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top