EuroWire July 2024

Technical Article

References

[1] Thomas Hähner, Bernhard Mund, Thomas Schmid, “History and recent trends of Triaxial test procedure”, Proceedings of the 67 th IWCS Cable & Connectivity Symposium, 2018 [2] Dave Hess, “The Shield is the Balun”, Proceedings of the 70 th IWCS Cable & Connectivity Symposium, 2021

Figure 4: Single-ended TCTL measurement

Transverse conversion transfer loss Transverse conversion transfer loss (TCTL) measurement was done by combining the measurements in the matched termination mode with the measurements in the full reflection mode. Because of a number of mathematical operations on the measurement data, the measurement floor of TCTL measurement with single-ended mode was worse than the traditional measurement. However, the overall correlation was meaningful. Figure 4 shows TCTL correlation data. Coupling attenuation, triaxial method Coupling attenuation measurement using the triaxial method [1] allows access to only one end of the cable assembly under test. Single-ended testing enables transfer parameter measurements, such as TCTL and transfer impedance, using a triaxial fixture by placing the passive termination device into the position of the balanced/unbalanced load (see Figure 5 ). Conclusions Single-ended measurement provides highly accurate measure- ment of TCL that can be applied to improved triaxial coupling attenuation measurements, which are a sum of unbalance attenuation and shield attenuation [2] . Single-ended measurement also provides a reasonable correlation on TCTL measurement that can be applied to further improved triaxial coupling attenuation measurements, insofar as TCTL is affected by phase unbalance, which can reduce coupling attenuation at high frequencies or long lengths [1] .

Courtesy of IWCS Cable & Connectivity Symposium, Charlotte, North Carolina, USA

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Figure 5: Balunless measurement of coupling attenuation of a cable assembly, triaxial method

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July 2024