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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Question on test scheme design for 4-port microstrip circuit - RF Cafe Forums

RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media platforms dominating public commenting venues. RF Cafe Forums began sometime around August of 2003 and was quite well-attended for many years. By 2010, Facebook and Twitter were overwhelmingly dominating online personal interaction, and RF Cafe Forums activity dropped off precipitously. Regardless, there are still lots of great posts in the archive that ware worth looking at. Below are the old forum threads, including responses to the original posts.

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sageme
 Post subject: Question on test scheme design for 4-port microstrip circuit
Posted: Thu Sep 24, 2009 2:39 pm 
 
Lieutenant

Joined: Wed Jul 09, 2008 11:51 am

Posts: 4

Location: Chicago

Dear all,

I designed a small four-port microstrip circuit (device under test), and obtained the simulation results. Since this 4-port microstrip circuit is very small, it does not have enough space for SMA connector mounting. Now I want (but I have no idea) to design a proper test scheme for purpose of the SMA-connector measurement of S parameters of this tiny four-port DUT by using four-port vector network analyzer. I really appreciate whatever help you could offer me on the test scheme design.

Thanks a lot.

Sincerely yours,

Kevin

Image

_________________

Pursuing perfectness pushes us to progress


 
   
 
Jessica
 Post subject: Re: Question on test scheme design for 4-port microstrip circuit
Posted: Thu Sep 24, 2009 3:46 pm 
 
Captain
User avatar

Joined: Thu Oct 12, 2006 7:50 am

Posts: 6

Hi Sageme,

If you only have a couple DUTs to measure, then you can probably solder a short section of small semi-rigid coax to the board that has an SMA on the other end. I've had great success with that up into the 6 GHz region (could probably go higher, butI've never needed to).

For measuring a large number of DUTs, a fixture will be necessary. I've never used one myself, but I see that a company called Gigalane has a productio quality fixture for measuring your type of PCB.

http://www.gigalane.com/index.html?mode=02_01_01_01&pduid=93

_________________

Thanks,

Jess


 
   
 
sageme
 Post subject: Re: Question on test scheme design for 4-port microstrip circuit
Posted: Mon Sep 28, 2009 12:13 pm 
 
Lieutenant

Joined: Wed Jul 09, 2008 11:51 am

Posts: 4

Location: Chicago

Dear Jessica,

Thanks a lot for the information your provided.

Actually, I only have a couple of DUTs to measure. I think it may be very difficult to solder a short section of small semi-rigid coax to the board for measurement, since our DUTs are so miniature that it may not have enough space for soldering. The distance between two adjacent ports is about 36mil=0.9mm on the same side (as indicated in the picture above), and the distance between adjacent port is about 164mil=4.2mm on two adjacent sides, which is the same as the DUT's length.

For the test fixture in your reply, it might be not proper for our measurement for the same reason that our DUT is too miniature. I checked the specifications of this test fixture. It requires that minimum length of DUT is 9mm and minimum width of DUT is 2.5mm.

What do you think of this? Or could you please offer some suggestions? Thank you so much!

Sincerely,

Kevin

Jessica wrote:
Hi Sageme,

If you only have a couple DUTs to measure, then you can probably solder a short section of small semi-rigid coax to the board that has an SMA on the other end. I've had great success with that up into the 6 GHz region (could probably go higher, butI've never needed to).

For measuring a large number of DUTs, a fixture will be necessary. I've never used one myself, but I see that a company called Gigalane has a productio quality fixture for measuring your type of PCB.

http://www.gigalane.com/index.html?mode=02_01_01_01&pduid=93

_________________

Pursuing perfectness pushes us to progress

Posted  11/12/2012

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