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Calibration WR-90-TNC

Question asked by esa on Feb 4, 2009
Latest reply on Feb 6, 2009 by RayH
Hello,

I need to measure S21 of one DUT which have port1 in WR-90 waveguide and port2 in TNC. The PNA cables are terminated in SMA.

Which is the better way of calibration to do this measurement?:

1-Calibrate TRL two port in WR-90 and then remove the WR-90 to coaxial adapter from port 2.
2-Calibrate TNC full two port and then to add the coaxial to WR-90 adapter to port 1
3-This two methods are not accurate enough. Maybe a need to calibrate firt SMA full two port and add to both ports the coaxial to WR-90 adapters,
measure the S21 (Half this value are the insertion losses of coaxial to WR-90 adapter). Then add to both ports the SMA to TNC adapters, measure the S21 (Half this value are the insertion losses of SMA to TNC adapter).
To measure with this SMA calibration, adding the SMA to TNC adapter on one port and the coaxial to WR-90 to the other port, the DUT. And to substract to the measurement the insertion losses values previosly calculated of the two added adapters.

I would like to know which is the better method (1,2 or 3).

Any suggestion will be wellcome  

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