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Intercomparison of permittivity measurements using the transmission/reflection method in 7-mm coaxial transmission lines

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4 Author(s)
Vanzura, E.J. ; Electromagn. Fields Div., Nat. Inst. of Stand. & Technol., Boulder, CO, USA ; Baker-Jarvis, J.R. ; Grosvenor, J.H. ; Janezic, M.D.

Broadband permittivity measurements made by eleven organizations using the transmission/reflection (T/R) method are compared to high-accuracy cavity resonator results. T/R accuracy is less than 10% for εr'<15, and the smallest measureable loss factor is εr"≈0.05. Uncertainty caused by the air gaps between the specimen and the inner and outer conductors is the largest contributor to the overall uncertainty. Compared to other dimensional measurement methods, physical measurement of specimen bore and outer diameters yield the most accurate gap corrections

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:42 ,  Issue: 11 )