PCB-mount connectors up to 40GHz?

Question

PCB-mount connectors up to 40GHz?

cqed (Electrical)

(OP)

4 May 09 03:21

Hi,

I would like to connect a planar waveguide PCB with a coaxial cable, causing minimum loss and degradation.
I know it's possible with SMP connectors which should in theory work up to 40 GHz, but in practice will start making problems at around 20 GHz (or so I've heard).
So is there a better type of connector out there? Is there such a thing like a 2.92mm-surface-mount? And where can I get it?

Higgler (Electrical) · Answer 1 · 2009-05-04 12:40:44

southwest microwave has 2.92 mm surface mount 50 ghz connectors.
http://www.southwestmicrowave.com/mpd/catalog/index.php?pdf=2.92mm.pdf

kch

cqed (Electrical) · Answer 2 · 2009-05-05 03:50:22

Thanks for the helpful comment. I have already checked out their site.
They have a nice modular system, but as far as I can see only straight connectors. That's fine, but a right angle connector would suit me even better. Does anyone know if they exist?

(By "right angle" I mean it connects the cable perpendicularly to the planar surface of the board.)

cqed

Higgler (Electrical) · Answer 3 · 2009-05-05 12:23:02

Are you going to microstrip or coplanar (CPW) on the CCA?

kch

cqed (Electrical) · Answer 4 · 2009-05-06 03:05:59

I am going to connect to coplanar waveguide.

cqed

Higgler (Electrical) · Answer 5 · 2009-05-06 14:06:01

50 ghz on a right angle launch, but I'd call them.
http://www.smelectronicsllc.com/SC5464.pdf

This is 40 ghz right angle, I recently used this up to 16 ghz, worked well once we got it properly soldered, was pulling off and ruining the cca's.
http://www.smelectronicsllc.com/SC5462.pdf

This is 40 ghz for end launch
http://www.smelectronicsllc.com/SC5412A.pdf

all these are in stock too.

kch

cqed (Electrical) · Answer 6 · 2009-08-25 05:00:59

These were good hints. Just incidentally, what could be recommended for transition to microstrip?

Higgler (Electrical) · Answer 7 · 2009-08-25 10:39:15

coplanar transitions to microstrip naturally on your circuit board when you widen the gaps between your center conductor line and top surface ground plane. While widening these gaps, also widen your center conductor line to arrive at 50 ohm microstrip.
Just do it gradually,

Here's a photo of it in the bottom left corner of this link, it looks like they shorted the top ground plane to the bottom ground plane in a few places, note the little bumps (usually 1/4 to 1/8th wave electrical spacing between shorts). This prevents current from getting between the parallel plates and causing those ugly zinger suckouts in VSWR and throughloss http://www.techbriefs.com/images/stories/techbriefs/2008/NPO-42763-fig1.png

I just googled "coplanar to microstrip transition" and clicked on Images on Google.

k

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PCB-mount connectors up to 40GHz?