[SI-LIST] Re: Surface mount SMB

  • From: "Loyer, Jeff" <jeff.loyer@xxxxxxxxx>
  • To: <martin@xxxxxxxxxxxxxx>, "Si-List" <si-list@xxxxxxxxxxxxx>
  • Date: Fri, 15 Nov 2002 07:31:27 -0800

I wasn't talking about edge mount, either.  When I say surface-mount, I =
mean the top or bottom surface.  And I wouldn't hesitate to make a =
90-degree turn at the geometries and frequencies we're concerned with.  =
The advantage I see to edge-launch connectors might be if there were =
intensive documentation on making the quietest launch, since they've =
been used quite a bit.  Barring that, I would go with the surface-mount. =
 At the 1.5GHz your original e-mail mentioned, the difference in signal =
integrity should be a moot point.  And, don't forget to void the ground =
plane under the center conductor's pad (although that's probably =
unnecessary at 1.5GHz).

Jeff Loyer



-----Original Message-----
From: Martin Euredjian [mailto:martin@xxxxxxxxxxxxxx]
Sent: Thursday, November 14, 2002 10:46 PM
To: Si-List
Subject: [SI-LIST] Re: Surface mount SMB



From: Rajiv Kumar Gupta

> I have worked successfully with SMA; Its always better to use surface
mount
> as far as possible
...
> Beside this always prefer Straight PCB mountable type of connector =
instead
of
> rectanglur type PCB mountable connectors.

When I referred to "surface mount" I wasn't necessarily talking about
edge-launch (which, I guess, can be considered SMT) connectors.  I'm
concerned about middle-of-the-board straight SMB's, you know, normal to =
the
PCB surface. That's a 90degree turn right there, and, more than likely, =
with
vias to boot.

I'm beginning to lean towards making changes in order to make =
edge-launch
SMB's work with this design.


=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D
 Martin Euredjian
  eCinema Systems, Inc.
       voice: 661-305-9320
       fax:   661-775-4876
  martin@xxxxxxxxxxxxxx
  www.ecinemasys.com
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D



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