Calibration Error Terms for a 2-Port VNA

[VNA Tools]

Hi,

I looked at the METAS VNA Tools II - Math Reference

but I do not understand where I can find the directivity, reflection tracking, source match and so on in the matrix E of the error terms?

Can you please explain it for a 2-Port VNA?

Regards

[Michael Wollensack METAS]

Hi,

it depends in which calibration model (switched vs generic) you are.

VNA Switched Calibration Model (only used for SOLT calibration)

Switched Error Terms 1 (Forward Error Terms, Source switched to port 1)

E11: Directivity Port 1		E13: Reflection Tracking Port 1
E21: Crosstalk from Port 1 to Port 2			E24: Transmission Tracking from Port 1 to Port 2
E31: 1		E33: Source Match Port 1
			E44: Load Match Port 2

Switched Error Terms 2 (Reverse Error Terms, Source switched to port 2)

	E12: Crosstalk from Port 2 to Port 1	E13: Transmission Tracking from Port 2 to Port 1
	E22: Directivity Port 2		E24: Reflection Tracking Port 2
		E33: Load Match Port 1
	E42: 1		E44: Source Match Port 2

VNA Generic Calibration Model (used for all other calibration)

Generic Error Terms

E11: Directivity Port 1	E12: Crosstalk from Port 2 to Port 1	E13: Tracking
E21: Crosstalk from Port 1 to Port 2	E22: Directivity Port 2		E24: Tracking / Symmetry
E31: 1		E33: Match Port 1
	E42: Symmetry		E44: Match Port 2

The generic error terms can be converted using the switch terms to the switched error terms. This can be used for comparison reasons.

Hope this helps.

Regards

Michael