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Measuring S Param. on 0402 RF Boards Using Tiny Semirigid - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement

Humane Society
 Post subject: Measuring S param. on 0402 RF boards using tiny semirigid
Posted: Wed Jul 12, 2006 3:04 pm 
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Joined: Wed Jul 12, 2006 2:20 pm
Posts: 4
Location: Arizona
I cannot believe I cannot find a solution!
I am trying to find a way of calibrating small tiny semirigid coax cables ( 1.2mm diameter ) for measuring S param. on RF boards populated with 0402 components. I tried soldering one end of this semirigid on a SMA connector already mounted on RF board, to use it as a reliable way of connecting my calibration kit and use it for reflection calibration.
Then I use a semirigid coax cable ( both ends SMA terminated ) to calibrate the trasmission, but at the end of calibration procedure, the measurements I took, differ a lot from "clasical calibration" ( the one which is using just simple coax cables ).
Where am I wrong ? What is going on?
ADS said that is very difficult to calibrate such stuff on 8753E unless I am using an additional software.
Please advise. Your help will be greatly appreciated.

Humane Society
 Post subject: Kirt, or Jerry please give me a solution
Posted: Thu Jul 13, 2006 5:34 pm 
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Joined: Wed Jul 12, 2006 2:20 pm
Posts: 4
Location: Arizona
So, I am still waiting for at an idea.
I do not think nobody used to work on 0402 parts.
Please !

Posted  11/12/2012

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