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The concept of nonradiative dielectric resonator is generalized in order toinclude axially open configurations having rotational invariance. The resultingadditional nonradiative conditions are established for the different resonancemodes on the basis of their azimuthal modal index. An approximate chart of theallowed dielectric and geometrical parameters for the TE011 mode is given. Apractical realization of the proposed device based on commercial fused quartztubes is demonstrated at millimeter wavelengths, together with simpleexcitation and tuning mechanisms. The observed resonances are characterized intheir basic parameters, as well as in the field distribution by means of afinite element method. The predictions of the theoretical analysis are wellconfirmed, both in the general behaviour and in the expected quality factors.The resulting device, in which the sample holder acts itself as single-moderesonating element, combines an extreme ease of realization withstate-of-the-art performances. The general benefits of the proposed opensingle-mode resonators are finally discussed.Comment: 18 pages, 10 figure

Axially open nonradiative structures: An example of single-mode resonator based on the sample holder