[SI-LIST] Re: High-Speed (coax) PCB Connector Transitions -- selection, PCB footprint, and performance

  • From: "Barnes, Heidi" <heidi.barnes@xxxxxxxxxx>
  • To: "Michael Rodrigues" <michael.rodrigues@xxxxxxxxxx>
  • Date: Mon, 9 Mar 2009 16:00:28 -0500

I prefer the Southwest 2.4mm since it just clamps to the PCB, can easilby be 
re-adjusted if mis-aligned and is re-usable.  Also the pins are replaceable and 
SMA versions are available.  The footprint is interchangeable with the 
Rosenberger 09K243-40ME3 if one needs a permenant soldered connection.  Let me 
know if you need the footprint I am using which is different from the Southwest 
data sheet and closer to what Rosenberger has for their connector.

Molex has a lower performance clamped on verticle SMA connector that may 
provide more mounting flexibility if you need it...Molex used it for a 
DesignCon paper in 2006 "Practical Design and Implementation of Stripline TRL 
Calibration Fixtures for 10-Gigabit Interconnect Analysis" 
http://www.designcon.com/infovault/paper.asp?PAPER_ID=219  They may have made 
improvements in the footprint since then.


Regards,
Heidi Barnes





-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On 
Behalf Of Michael Rodrigues
Sent: Monday, March 09, 2009 10:51 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] High-Speed (coax) PCB Connector Transitions -- selection, 
PCB footprint, and performance

Hello all at SI-List,
 

I am trying to implement a PCB connector transition board for the purpose of 
measuring a structure at up to 20 GHz. I would be interested in using the best 
performing coax-to-PCB launch I can find so that it will not contribute losses 
to the actual structure losses I am interested in measuring (i.e., it will be 
invisible to the measurement, or as much so as possible).

 

Two questions I have would be:

1)       What would be the best connector type for this purpose (i.e.,
interfacing to VNA and high-speed o-scopes for s-parameter, TDR, and TDT 
measurements)?

2)       How important is the PCB footprint for the connector; what
would be the best way to make sure you are using the best footprint possible 
(assuming the case where PCB footprint for a PCB connector are not a 
no-brainer)?

 

Some connectors I have been looking at would include:

 

2.4 mm (DC to 50 GHz):

*       Rosenberger 09K243-40ME3
*       Southwest 1493-03A-5

 

 

Mini-SMP (DC to 65 GHz):

*       Rosenberger 18 S 203- 40M L5 
*       Rosenberger 18 S 102- 40M L5

 

Thank you in advance for any replies.

 

Best regards,

Michael



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