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Connectors with multiple RF feethroughs

J

Joel Kolstad

Jan 1, 1970
0
Does anyone know of a connector that'll pass multiple 8+) RF signals with
specs somewhere in the ballpark of 100kHz-3GHz, isolation between signals at
least 80dB or so? I'm aware of the FCT connectors
(http://www.fctgroup.com/Englisch/prod/ml/default.asp) that Mouser sells, and
this is what I intend to use for "box to box" connectivity, but for PCB to PCB
connectivity within a box, I was hoping to find something a little denser (FCT
gives you 7 coax connectors in a DB-37 sized shell).

Samsung and friends have high speed connectors that typically have a ground
plane 'down the middle' of a two row connector, but the data on their website
seems squarely aimed at digital signals where a couple percent crosstalk is
fine; in my case there can readily be a 0dBm signal right next to one
that's -80dBm, so the ~ 20-40dB isolation between signals is far from
adequate. I could insert interstitial grounds between the signal pins,
although I was hoping to find something off-the-shelf that already comes with
data, rather than having to sit down and sweep something like the Samtec
connection on my own.

Thanks,
---Joel Kolstad
 
T

Tim Shoppa

Jan 1, 1970
0
Amphenol makes the Fakra SMB connectors that are available in dual
configs.

That's nowhere near the density of the coax-in-a-D-sub-shell you
already found.

Amphenol used to make a connector that goes on a PCB like a IDC header
but the cable housing that plugged into it took high-density coaxial
cables. Haven't seen this in many years.

More off the beaten track, LEMO (http://www.lemousa.com/) makes some
really high quality multi-coaxial (at least 8-way) connectors but they
won't be cheap or particulary easy to source. I've seen these used on
everything from high-energy physics instrumentation to medical
instruments.

Tim.
 
T

Tim Wescott

Jan 1, 1970
0
Joel said:
Does anyone know of a connector that'll pass multiple 8+) RF signals with
specs somewhere in the ballpark of 100kHz-3GHz, isolation between signals at
least 80dB or so? I'm aware of the FCT connectors
(http://www.fctgroup.com/Englisch/prod/ml/default.asp) that Mouser sells, and
this is what I intend to use for "box to box" connectivity, but for PCB to PCB
connectivity within a box, I was hoping to find something a little denser (FCT
gives you 7 coax connectors in a DB-37 sized shell).

Samsung and friends have high speed connectors that typically have a ground
plane 'down the middle' of a two row connector, but the data on their website
seems squarely aimed at digital signals where a couple percent crosstalk is
fine; in my case there can readily be a 0dBm signal right next to one
that's -80dBm, so the ~ 20-40dB isolation between signals is far from
adequate. I could insert interstitial grounds between the signal pins,
although I was hoping to find something off-the-shelf that already comes with
data, rather than having to sit down and sweep something like the Samtec
connection on my own.

Thanks,
---Joel Kolstad
W. L. Gore makes (or used to make) insanely small, high-performance coax
(the dielectric is basically Gore-Tex). If they don't have connectors
for it they should know who does.
 
R

Rene Tschaggelar

Jan 1, 1970
0
Joel said:
Does anyone know of a connector that'll pass multiple 8+) RF signals with
specs somewhere in the ballpark of 100kHz-3GHz, isolation between signals at
least 80dB or so? I'm aware of the FCT connectors
(http://www.fctgroup.com/Englisch/prod/ml/default.asp) that Mouser sells, and
this is what I intend to use for "box to box" connectivity, but for PCB to PCB
connectivity within a box, I was hoping to find something a little denser (FCT
gives you 7 coax connectors in a DB-37 sized shell).

Samsung and friends have high speed connectors that typically have a ground
plane 'down the middle' of a two row connector, but the data on their website
seems squarely aimed at digital signals where a couple percent crosstalk is
fine; in my case there can readily be a 0dBm signal right next to one
that's -80dBm, so the ~ 20-40dB isolation between signals is far from
adequate. I could insert interstitial grounds between the signal pins,
although I was hoping to find something off-the-shelf that already comes with
data, rather than having to sit down and sweep something like the Samtec
connection on my own.

Joel,
you're aware that you'll never get 80dB isolation at 3GHz with
flexible cable ? Even double shielded leaks more. Semi-Rigid is
not everyones favourite.

Rene
 
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