FPGA Central

Hi all
*
what's the typical value of insertion loss of a typical SMA connector?
*
thanks,Regards


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Mo

It Depends. Here's a Johnson spec for various types of SMA connectors

Insertion Loss: (dB maximum)
Straight flexible cable connectors
and adapters ...................... 0.06 Sqrt(f )(GHz), tested at 6 GHz
Right angle flexible cable
connectors ......................... 0.15 Sqrt(f ) (GHz), tested at 6 GHz
Straight semi-rigid cable
connectors with contact ..... 0.03 Sqrt(f ) (GHz), tested at 10 GHz
Right angle semi-rigid cable
connectors ......................... 0.05 Sqrt(f )(GHz), tested at 10 GHz
Straight semi-rigid cable
connectors w/o contact ...... 0.03 Sqrt(f ) (GHz), tested at 16 GHz
Straight low loss flexible
cable connectors ................ 0.06 Sqrt(f ) (GHz), tested at 1 GHz
Right Angle low loss flexible
cable connectors ................ 0.15 Sqrt(f ) (GHz), tested at 1 GHz

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Mohamad Haghtalab wrote:
> Hi all
>
> what's the typical value of insertion loss of a typical SMA connector?
>
> thanks,Regards
>
>
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Scott,
what is the point of giving a frequency dependent expression and saying that
it is true at just one frequency point? Should one assume that it holds true
within a certain range around the tested frequency? How wide is the range
then? Have I missed something here?
Thank you.
Vadim
On Mon, Jul 20, 2009 at 12:55 PM, Scott McMorrow <scott (AT) teraspeed (DOT) com>wrote:

> Mo
>
> It Depends. Here's a Johnson spec for various types of SMA connectors
>
> Insertion Loss: (dB maximum)
> Straight flexible cable connectors
> and adapters ...................... 0.06 Sqrt(f )(GHz), tested at 6 GHz
> Right angle flexible cable
> connectors ......................... 0.15 Sqrt(f ) (GHz), tested at 6 GHz
> Straight semi-rigid cable
> connectors with contact ..... 0.03 Sqrt(f ) (GHz), tested at 10 GHz
> Right angle semi-rigid cable
> connectors ......................... 0.05 Sqrt(f )(GHz), tested at 10 GHz
> Straight semi-rigid cable
> connectors w/o contact ...... 0.03 Sqrt(f ) (GHz), tested at 16 GHz
> Straight low loss flexible
> cable connectors ................ 0.06 Sqrt(f ) (GHz), tested at 1 GHz
> Right Angle low loss flexible
> cable connectors ................ 0.15 Sqrt(f ) (GHz), tested at 1 GHz
>
> --
> Scott McMorrow
> Teraspeed Consulting Group LLC
> 121 North River Drive
> Narragansett, RI 02882
> (401) 284-1827 Business
> (401) 284-1840 Fax
>
> http://www.teraspeed.com
>
> Teraspeed® is the registered service mark of
> Teraspeed Consulting Group LLC
>
>
> Mohamad Haghtalab wrote:
> > Hi all
> >
> > what's the typical value of insertion loss of a typical SMA connector?
> >
> > thanks,Regards
> >
> >
> > ------------------------------------------------------------------
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Heyfitch.

Here is a typical data sheet for a strait SMA to cable connector. This device type is very wide band and can work very well up into the high 20ghz range or higher with the right dielectric etc etc. I have never used them above 23 Ghz.

http://www.carlisleit.com/v2/productFiles/OL_5720-1.pdf

The S-parameters are not part of this data sheet but if your real interested talk to the MFG and see about getting them. For MIL-C-17 specs. VSWR: 1.15 + 0.01 f(ghz) Insertion loss: .06x sqrt f (ghz). Same equation as what Scott has posted.

Google Mil-C-17, there is alot of info out there on this spec. If your trying to build a coaxial cable whats more critical is the type of cable that gets connected to the SMA connector and how its constructed. The coaxial cable itself is always the part that limits the useful frequency range in an SMA to coax to SMA connector.

Richard Jungert







> Date: Mon, 20 Jul 2009 20:11:05 -0500
> Subject: [SI-LIST] Re: SMA connector Insertion Loss
> From: heyfitch (AT) ieee (DOT) org
> To: scott (AT) teraspeed (DOT) com
> CC: mohaghtalab (AT) yahoo (DOT) com; si-list (AT) freelists (DOT) org
>
> Scott,
> what is the point of giving a frequency dependent expression and saying that
> it is true at just one frequency point? Should one assume that it holds true
> within a certain range around the tested frequency? How wide is the range
> then? Have I missed something here?
> Thank you.
> Vadim
> On Mon, Jul 20, 2009 at 12:55 PM, Scott McMorrow <scott (AT) teraspeed (DOT) com>wrote:
>
> > Mo
> >
> > It Depends. Here's a Johnson spec for various types of SMA connectors
> >
> > Insertion Loss: (dB maximum)
> > Straight flexible cable connectors
> > and adapters ...................... 0.06 Sqrt(f )(GHz), tested at 6 GHz
> > Right angle flexible cable
> > connectors ......................... 0.15 Sqrt(f ) (GHz), tested at 6 GHz
> > Straight semi-rigid cable
> > connectors with contact ..... 0.03 Sqrt(f ) (GHz), tested at 10 GHz
> > Right angle semi-rigid cable
> > connectors ......................... 0.05 Sqrt(f )(GHz), tested at 10 GHz
> > Straight semi-rigid cable
> > connectors w/o contact ...... 0.03 Sqrt(f ) (GHz), tested at 16 GHz
> > Straight low loss flexible
> > cable connectors ................ 0.06 Sqrt(f ) (GHz), tested at 1 GHz
> > Right Angle low loss flexible
> > cable connectors ................ 0.15 Sqrt(f ) (GHz), tested at 1 GHz
> >
> > --
> > Scott McMorrow
> > Teraspeed Consulting Group LLC
> > 121 North River Drive
> > Narragansett, RI 02882
> > (401) 284-1827 Business
> > (401) 284-1840 Fax
> >
> > http://www.teraspeed.com
> >
> > Teraspeed® is the registered service mark of
> > Teraspeed Consulting Group LLC
> >
> >
> > Mohamad Haghtalab wrote:
> > > Hi all
> > >
> > > what's the typical value of insertion loss of a typical SMA connector?
> > >
> > > thanks,Regards
> > >
> > >
> > > ------------------------------------------------------------------
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> > >
> > >
> >
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Thanks to everyone who answered. To summarize what I've learned:

I understand the idea of linear building blocks and that each element can be rearranged and the end result is the same - so in effect the location of the ac coupling (dc block) capacitor makes little difference IF ALL THINGS REMAIN THE SAME.

As has been pointed out, often ALL THINGS DO NOT REMAIN THE SAME when the capacitor is moved around. Different locations allow for different numbers of vias which has a great effect on overall SI.

We routinely minimize numbers of vias and try to backdrill vias at connectors and other vias where possible on these speed traces.

I have not been subscribed on this forum/freelist long, but I've been a casual reader when the topic has been of interest. I appreciate everyone's feedback.
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Justin, not quite. I think you need to pay attention to Istvan's
comments in particular. If you make the capacitor / mount / transition
look resistive over the signal spectral content and matched to the
channel, you can put it just about anywhere without impact. To the
extent that it presents a discontinuity, what is close by can matter
significantly. This is over and above whether locating in a particular
arrangement can eliminates or introduces discontinuities like vias.

Steve

Smith, Justin D. wrote:
> Thanks to everyone who answered. To summarize what I've learned:
>
> I understand the idea of linear building blocks and that each element can be rearranged and the end result is the same - so in effect the location of the ac coupling (dc block) capacitor makes little difference IF ALL THINGS REMAIN THE SAME.
>
> As has been pointed out, often ALL THINGS DO NOT REMAIN THE SAME when the capacitor is moved around. Different locations allow for different numbers of vias which has a great effect on overall SI.
>
> We routinely minimize numbers of vias and try to backdrill vias at connectors and other vias where possible on these speed traces.
>
> I have not been subscribed on this forum/freelist long, but I've been a casual reader when the topic has been of interest. I appreciate everyone's feedback.
> ================================================== ==========
> The information contained in this message may be privileged
> and confidential and protected from disclosure. If the reader
> of this message is not the intended recipient, or an employee
> or agent responsible for delivering this message to the
> intended recipient, you are hereby notified that any reproduction,
> dissemination or distribution of this communication is strictly
> prohibited. If you have received this communication in error,
> please notify us immediately by replying to the message and
> deleting it from your computer. Thank you. Tellabs
> ================================================== ==========
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