Abstract
A technique for measuring dielectric and magnetic properties of materials by the waveguide method is proposed in which the error, associated with the presence of gaps between the sample and the waveguide wall is eliminated by comparison with the results of numerical analysis of a 3D model the dielectric characteristics of which are optimized in order to achieve the best agreement between the calculated and experimental data.
Highlights
Defining dielectric properties of absorbing materials is an important part in microwave electronics
At the same time the simplest Nicolson-Ross-Weir (NRW) algorithm [5-6] can produce a significant error due to the influence of a badly-controlled gap between the measured sample and the waveguide wall. To solve this problem the NRW algorithm and a correction formula were proposed, the latter takes into account the gap between the sample and the waveguide (1) [7]
Where, εs is a relative permittivity of the sample material, εNRW is a measured relative permittivity, calculated using the NRW algorithm, b is the height of the waveguide, ∆b is the height of the gap
Summary
Defining dielectric properties of absorbing materials is an important part in microwave electronics. To solve this problem the NRW algorithm and a correction formula were proposed, the latter takes into account the gap between the sample and the waveguide (1) [7].
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