Mail*Link(r) SMTP               FWD>RE>DES:PC Board Frequency Limits

Doug:

I agree with Ken, this type of discussion should be on technet as more people
become more involved in high speed/frequency designs you kind of experience
becomes very valuable.

IMO, I suspect you may have used a multistaged Butterworth Low-Pass filter
analysis, and depending on the inductive and capacitive elements you could
achieve the roll off you describe with a sufficient number of stages.

Ralph Hersey
e-mail:  [log in to unmask]
 

--------------------------------------
Date: 5/8/96 10:23 AM
From: Ken Barrett
Actually this is the type of discussion I'd like to see on this forum.

Ken Barrett
Cisco Systems
San Jose CA.
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     I would like any responses to be off-line for the following 
     discussion.
     
     Please use the following email address:  [log in to unmask]
     
     I made a simple mathematical model of a stripline, 1 inch trace, on 
     FR-4, nothing out of the ordinary as far as dimensions and found to my 
     surprise a resonant freq at about 800 MHz with a 20 to 40 dB roll-off 
     above 800 MHz
     
     Could someone in the RF/Microwave world of nuts and bolts pc board 
     design tell me what I'm supposed to do at say 10 GHz with regular pc 
     board materials/construction/fabrication???
     
     Thanks in advance, Doug McKean



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