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. [log in to unmask] ----- Begin Included Message ----- >From [log in to unmask] Tue May 7 19:03:51 1996 Resent-Date: Tue, 7 May 1996 21:00:21 -0700 Resent-Sender: [log in to unmask] Old-Return-Path: <[log in to unmask]> From: [log in to unmask] Date: Tue, 07 May 96 18:55:11 CST Encoding: 16 Text To: [log in to unmask], [log in to unmask] Subject: PC Board Frequency Limits Resent-Message-ID: <"U3ffi.0.8DH.W1_Zn"@ipc> Resent-From: [log in to unmask] X-Mailing-List: <[log in to unmask]> archive/latest/1686 X-Loop: [log in to unmask] Resent-Sender: [log in to unmask] Content-Length: 659 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 ----- End Included Message ----- ------------------ RFC822 Header Follows ------------------ Received: by quickmail.llnl.gov with SMTP;8 May 1996 10:21:28 -0700 Received: from ipc.org by simon.ipc.org via SMTP (940816.SGI.8.6.9/940406.SGI) id MAA08428; Wed, 8 May 1996 12:17:26 -0700 Resent-Date: Wed, 8 May 1996 12:17:26 -0700 Received: by ipc.org (Smail3.1.28.1 #2) id m0uHBkQ-0000GPC; Wed, 8 May 96 11:05 CDT Resent-Sender: [log in to unmask] Old-Return-Path: <[log in to unmask]> From: Ken Barrett <[log in to unmask]> Date: Wed, 8 May 1996 09:10:21 -0700 Message-Id: <[log in to unmask]> To: [log in to unmask], [log in to unmask] Subject: Re: PC Board Frequency Limits Resent-Message-ID: <"6_RX63.0.AuF.IPCan"@ipc> Resent-From: [log in to unmask] X-Mailing-List: <[log in to unmask]> archive/latest/3938 X-Loop: [log in to unmask] Precedence: list Resent-Sender: [log in to unmask]