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The influence of the sample thickness in the measurements of dielectric characteristics with transmission lines by the method of Roberts-Von Hippel

1964; Elsevier BV; Volume: 30; Issue: 3 Linguagem: Inglês

10.1016/0031-8914(64)90152-1

1873-1767

M. Mandel, Carmela De Marco,

Scientific Measurement and Uncertainty Evaluation

Abstract A theoretical expression is derived for the relative error on e′ and e′ when measured with the method of Roberts-von Hippel using coaxial transmission lines. This expression is shown to depend on the experimental accuracy of the measureable quantities but also on the characteristic parameters of the sample e′, e″ and its thickness h. Numerical calculations show how in various cases these errors change with h. It is also demonstrated that for polar samples the choice of the thickness of the sample may become critical. Some experimental results are given to illustrate this effect.