[SI-LIST] Re: resonance in insertion loss

  • From: Syed Razeen <razeen_rulez@xxxxxxxxxxx>
  • To: "hzyltgg@xxxxxxxxx" <hzyltgg@xxxxxxxxx>
  • Date: Tue, 27 Nov 2012 02:29:44 +0800 (SGT)

Hi,
If there are ripples in the plot it can be due to impedance discontinuities, 
Poor Calibration and may also have PCB effects The ripples can be avoided if u 
can do a measurement with reduced frequency span. 
At higher frequency, the impedance discontinuities,typically from connectors or 
vias, cause ripples in the insertion loss.
 
Regards
Razeen


________________________________
 From: 黄涛 <hzyltgg@xxxxxxxxx>
To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx> 
Sent: Monday, 26 November 2012 8:24 PM
Subject: [SI-LIST] resonance in insertion loss
 
hi si experts:
When I test s-parameters of trace at PCB,the s21 does not show straight
line but a dip or up/down ripple when freqency upto some point
Who can help to explain  how this produce or advise me some paper
Thanks a lot.

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