"Can someone explain, why Agilent 85052B standard definition table has Open 3.5/2.92 , Open 3.5/SMA and Open2.92/SMA definitons. Such a calkit dosen't inlude those components at all? What could be right purpose to use those informations?"
"Related question,I want to use a network analyzer with SMA cables and will measure SMA devices. Can I use the 85052B calibration kit? Which set of standard definitions are correct in this case? I'll have a discontinuity during the calibration (SMA to 3.5mm) but not during the measurement (SMA to SMA).If the 85052B is not recommended, what is?Thanks,Steve Ortiz"
"Dave,Thanks for the quick and thoughtful reply.What do you think of this idea?1. Compute shunt capacitance due to SMA to 3.5mm step discontinuity (or look it up from reference you attached)2. In ADS enter calibration standards definitions with the additional shunt capacitance from step 1 where SMA to 3.5mm connection is used. Compute modified standards definitions.3. Enter modified standards definitions into PNA and calibrate SMA ports with 85052B (3.5mm connectors).4. Now, SMA to SMA measurements on PNA screen should be correct with no post processing or fixture removal required.By the way, I thought this is what the 3.5/SMA standards definitions were! But, it appears the shunt capacitance from the step discontinuity in Table 1 of Roger's paper match the 8510 standard definitions for the standards labeled 3.5/SMA of standard type OPEN, so these aren't what I thought there were.Thanks,Steve"
"I am also interested in this discussion.In my case, I have DUTs with 2.92 mm connectors and I would like to measure them after calibrating 3.5 mm test ports on a PNA. How should I do this?I'd also like to get just a little clarification regarding the suggestion of the Pollard paper. My reading of it is that a simple capacitive two-port model represents the outer conductor discontinuity when mating 3.5 and 2.92. The value of the capacitance being given by the coefficients in Table 1. Is that correct?"
"If so, to get the modified cal standard values, I would have cascaded that 2-port model with the usual 3.5 mm calibration standard models, based on the standard definitions and the corresponding equations. Does that make sense? "
"I'm not familiar with the PNA fixturing tool, but from a quick look just now it did not seem straightforward to introduce Pollard's frequency dependent capacitance polynomial (port matching looks promising, but I think one needs to enter a single value, not a polynomial expression). So, could you please give me a little more advice on how to use fixturing in this case?"
"... You would then compute the s-parameters for the 3.5mm / 2.92 mm transition and use the s-parameter data (S2P file) on each testport to deembed the effects of the connector change from the DUT measurement."
"Thanks for that Dave.Do you mean that I would compute the S-parameters as a function of frequency for the 2-port with a shunt capacitance defined by the polynomial in Pollard's paper?"
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