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Multiline TRL

Question asked by cyn on Jun 16, 2011
Latest reply on Jun 21, 2011 by cyn

TRL uses several air lines during the calibration to cover a wide frequency range, I am wondering how the PNA treats the the problematic frequency points where the length of the line is multiple of half wavelength. Specifically,

(1) is PNA's algorithm based on the original paper by Engen and **** ("Thru-Reflect-Line: An improved technique for calibrating the dual six-port automatic network analyzer", IEEE Trans. Microwave Theory Tech., vol. 27, no. 12, pp. 987-993, 1979.) or a more recent paper by Marks ("A multiline method of network analyzer calibration", IEEE Trans. Microwave Theory Tech., vol. 39, no. 7, pp. 1205-1215, 1991.)?

(2) as for Agilent's TRL calibration kits, e.g., the 3.5mm 85052B kit, are the lines designed based on the convention to limit a single pair of lines to have phase difference between 20 to 160 degree, or based on the optimum combination of lengths suggested by Marks?

Many thanks.