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Does this look to be excessive ripple? What caues it?

Question asked by drkirkby on Apr 19, 2013
Latest reply on Apr 27, 2013 by Dr_joel


1 ) Stuck a couple of 3.5 mm to N adapters on the 3.5 mm test cables of my 8720D VNA. One gave me a female N, the other a male 
2) Performed a full 2-port calibration of the VNA from 50 MHz to 6 GHz with an 85032B cal kit. I used no averaging, but did reduce the IF bandwidth to 1 kHz from the default 3 kHz.
3) Promptly measured S21 of an attenuator rated to 1 GHz.surprising 

The result is as shown. I know that S11 and S12 are of the order of 20 dB at 6 GHz, which is not given this attenuator is rated to 1 GHz.

There is a very noticable rippled on the device, which may be real, but may be not. Does the frequency of this ripple indicate anything useful? Is this excessive, or to be expected?

Dave  

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