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sma calibration

Question asked by sgh on Oct 19, 2009
Latest reply on Oct 19, 2009 by tsilchia

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Hi,

I apologize if this question is asked often, it kind of seems like it would be.

I have N to sma adapters, but I have only an N cal. kit. I doubt my boss would sponsor the purchase of an sma cal. kit, so, calibrating the sma ports in that way is not an option. Can I calibrate the N ports, then then just port-extend to the ends of the sma cables? Any other ideas?

Thanks a lot,
sean

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daras Oct 19, 2009 9:15 AM
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Depending on the VNA that you have port extensions will account for the loss and the delay in the adaptors you add after the calibration reference plane, but port extensions does not compensate for mismatch at the adaptor to DUT interface. If power is not a big concern, I would reccomend throwing in a 3 or 6 dB pad at the SMA end of the adaptor and then use port extension. That should improve your measurement somewhat.
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Dr_joel Oct 19, 2009 10:07 AM
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If you use attenuators, they must be type N, and you must calibrate with the attenuators in place, in type N, before you add the N-to-sma adapters. Otherwise, the setup daras suggests is good.

Be, in fact, if you have decent adapters, you have a good chance of getting fine results just with port extensions.
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tsilchia Oct 19, 2009 3:30 PM
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The following may be worth reviewing 'Use of Adapters in Network Analysis' available at http://www.agilent.com/metrology/adapter.shtml. It is an article / summary on the use of adapters in network analysis applications as posted at the metrology forum.

Sincerely,
tsilchia.
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