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Precision Waveguide Cal- Effective RL w/fixed & sliding load

Question asked by kmcmenamin on Jun 11, 2010
Latest reply on Jun 14, 2010 by daveb
Is there an easy way to determine when a sliding load needs to be used for VNA calibration?  Or, put another way, at what expected DUT return loss performance does the broadband load/connector interface cease to be sufficient to accurately characterize the DUT's own return loss?  I've done some looking but haven't found anything with a satisfactory answer.

And, as a follow-up, how (in general) does an E-cal module compare to fixed and sliding loads?  And the recharacterization of the E-cal module for waveguide interfaces?

Source of my question:  I need to measure some low return loss waveguide assemblies to demonstrate that they meet their spec (> 30 dB).  I'd like to measure above 50 dB, to see how well they match the simulation. I am using a PNA-X and I am open to using any calibration technique and devices that offer the greatest precision. Most of my waveguide measurements are between 8 and 110 GHz with some work even higher in frequency.