Abstract. The cylindrical resonator operating with TE₀₁₁ mode is used for complex permittivity measurement of different materials: foams, layers, dielectric sheets. The measuring resonator with unloaded quality factor more than 15000 for Ku band is designed and tested. The calculation expressions are based on an exact solution for the resonator entirely filled with foam material. Perturbation technique is used when thin disk samples are placed in the middle of the resonator height. The measurement error for foam materials is 0.1% for permittivity and 5–10% for dielectric loss. The error for layers and sheets measurements is in the limits of 2–4% for permittivity and 10% for loss factor. The described measuring procedures are easy for practical realization and ensure enough accuracy for estimation of complex permittivity in the range of 12–13 GHz.

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