[SI-LIST] Re: Fw: RE: low loss & smallest size flexible Co-axial Cable

Pam,

Our RF25M series performs much better than our MH081 series.  I've
attached our characterization report for our Bullseye test point to SMA
assembly.  For a 6 inch sample, it is only seeing about 1.5dB of loss at
20 GHz.  An SMA to SMA assembly would perform quite similar.

As David mentioned, low attenuation is generally not associated with
small coax. The cable used in our RF25M series utilizes an air
dielectric which allows us to have low attenuation with a smaller size
than our other series like RG316.

Also, if you are limited in launch space on your PCB board, you might
want to look into our Bullseye test point system.  It's a low cost,
space saving way to provide a reliable connection.

Thanks,
Tori Meek
Samtec Inc
Signal Integrity Group


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of DAVID CUTHBERT
Sent: Thursday, June 25, 2009 4:44 AM
To: padma gundala
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Fw: RE: low loss & smallest size flexible
Co-axial Cable

You will find that there is no 'magic' small low loss cable. Most of the
loss (below several GHz) is due to the resistance of the inner
conductor.
Since small coax has a small inner conductor the losses are higher. The
best
that can be done is to use foamed telfon inner insulation to lower the
effective Er which therefore leads to a larger innner conductor.
   Dave Cuthbert

On Wed, Jun 24, 2009 at 6:14 PM, padma gundala
<pgundala2001@xxxxxxxxx>wrote:

>
> --- On Wed, 6/24/09, padma gundala <pgundala2001@xxxxxxxxx> wrote:
>
>
> From: padma gundala <pgundala2001@xxxxxxxxx>
> Subject: RE: [SI-LIST] low loss & smallest size flexible Co-axial
Cable
> To: "Tori Meek" <tori.meek@xxxxxxxxxx>
> Date: Wednesday, June 24, 2009, 5:12 PM
>
>
>
>
>
>
>
> Tori,
>
> How does this compare to the .81 cable of samtec attached, in terms of
the
> 3db loss?
> This is what we used earlier to perform signal integrity tests
initially.
> We use one end of the cable to solder to PCB.
> Since it is really small , very flexible connecting to the sma does
not
> cause solder to break off.
> Also the photos of the cable you have suggested looks very wide like a
> ribbon.
>
> Thanks,
> Pam
>
> --- On Wed, 6/24/09, Tori Meek <tori.meek@xxxxxxxxxx> wrote:
>
>
> From: Tori Meek <tori.meek@xxxxxxxxxx>
> Subject: RE: [SI-LIST] low loss & smallest size flexible Co-axial
Cable
> To: pgundala2001@xxxxxxxxx
> Date: Wednesday, June 24, 2009, 1:48 PM
>
>
>
>
>
>
>
>
> Pam,
>
> Check out our RF25M series:
> http://samtec.com/technical_specifications/overview.aspx?series=rf25m
.
>  It's a low loss cable that has an outside diameter of 1.9mm compared
to the
> RG316 diameter of 2.53mm.  We offer both the SMA plug and bulkhead
jack as
> terminations.
>
> If you think this will work, configure a part number from the prints
at the
> above link and I can get you some samples.
>
> Thanks,
> Tori Meek
> Samtec Inc
> Signal Integrity Group
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of pgundala2001@xxxxxxxxx
> Sent: Wednesday, June 24, 2009 3:38 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] low loss & smallest size flexible Co-axial Cable
>
>  Hi ,
>
> Can any recommend a co-axial cable that has low losses like the RG
316\(100
> ohms diff. impedance) , yet the size of overall dia. needs to be min.
(very
> flexible) with sma connector connected.
> Samtec's MH081 cable with sma connector is good except the attenuation
db/m
> is almost double of the RG316.
>
> Thanks,
>
> Pam
>
>
>
>
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