Calibrating a VANA with a slightly lossy beadless coaxial standard line

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Calibrating a VANA with a slightly lossy beadless coaxial standard line

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Use of a beadless coaxial standard line to calibrate a vector-indicating automatic network analyser (VANA) provides for measurement of the voltage reflection coefficient Γ in terms of the mode propagated by that line. Owing to skin effects, the impedance Zm assigned to that mode differs from that defined for an ideal lossless line of appropriate dimensions, Zdef (= 50 Ω). The author reports results of expressing the measured Γ in terms of the nominal Zdef for f ≥ 0.05 GHz, after accounting for the conductor loss by measurements with a type N beadless coaxial standard line.

Inspec keywords: microwave reflectometry; coaxial cables; calibration; measurement standards; automatic test equipment; network analysers; skin effect

Other keywords: mode propagation; voltage reflection coefficient measurement; 0.05 GHz; impedance; vector-indicating automatic network analyser; skin effects; VANA; type N beadless coaxial standard line; calibration; conductor loss

Subjects: Measurement standards and calibration; Microwave measurement techniques; Other instrumentation and measurement systems; Computerised instrumentation

References

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      • W.C. Daywitt . First-order symmetric modes for a slightly lossy coaxial transmissionline. IEEE Trans. , 11 , 1644 - 1651
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      • D. Woods . Multiport-network analysis by matrix renormalisation employing voltagewaves S-parameterswith complex normalisation. Proc. IEE , 3 , 198 - 204
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      • W.E. Williams , A. Chakrabarti . Reflection at a discontinuity in a transmission line. IMA J. Appl. Math. , 185 - 195
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