[SI-LIST] Re: High-Speed (coax) PCB Connector Transitions -- selection, PCB footprint, and performance
- From: wolfgang.maichen@xxxxxxxxxxxx
- To: "Barnes, Heidi" <heidi.barnes@xxxxxxxxxx>
- Date: Mon, 9 Mar 2009 17:07:56 -0700
I would second the recommendation for the Southwest Microwave edge launch
connectors. A bit on the pricey side, but that gets compensated by the
fact that you can re-use them easily since they are press-fit (only
screwed down, not soldered). The only issue I had with them was out of
some reason with thicker boards (over 100 mils) sometimes the center
conductor would not make contact and I had to manually bend it downwards
slightly (VERY carefully because it is thin and fragile). Otherwise,
performance is great - of course you need take great care with the board
(trace) layout & landing pattern / vias in order to get the most out of
the connector. Southwest has a few standard landing patterns available on
demand.
Rosenberger works well, too, and with a bit of luck and carefulness you
can desolder an re-use them, too (that usually takes two peope, one
unscrewing and holding the connector, and one operating the heat gun,
otherwise you'll break off the fragile center connector).
Wolfgang
"Barnes, Heidi" <heidi.barnes@xxxxxxxxxx>
Sent by: si-list-bounce@xxxxxxxxxxxxx
03/09/2009 02:00 PM
To
"Michael Rodrigues" <michael.rodrigues@xxxxxxxxxx>
cc
<si-list@xxxxxxxxxxxxx>
Subject
[SI-LIST] Re: High-Speed (coax) PCB Connector Transitions -- selection,
PCB footprint, and performance
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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Other related posts:
- » [SI-LIST] High-Speed (coax) PCB Connector Transitions -- selection, PCB footprint, and performance- Michael Rodrigues
- » [SI-LIST] Re: High-Speed (coax) PCB Connector Transitions -- selection, PCB footprint, and performance- Barnes, Heidi
- » [SI-LIST] Re: High-Speed (coax) PCB Connector Transitions -- selection, PCB footprint, and performance - wolfgang . maichen
- » [SI-LIST] Re: High-Speed (coax) PCB Connector Transitions -- selection, PCB footprint, and performance- Barnes, Heidi
- » [SI-LIST] Re: High-Speed (coax) PCB Connector Transitions -- selection, PCB footprint, and performance- Scott McMorrow
- » [SI-LIST] Re: High-Speed (coax) PCB Connector Transitions -- selection, PCB footprint, and performance- QU Perry
- » [SI-LIST] Re: High-Speed (coax) PCB Connector Transitions -- selection, PCB footprint, and performance- wolfgang . maichen
