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Electrostriction can be used to control low loss and highly tunable microwave dielectric devices (filters and phase shifters). Dielectric or metallic parts of such a device should have the dirigible air gap between them. For non-hysteresis control these devices use relaxor ferroelectric with large electrostriction. However, electro-mechanic way of control might have a restriction in the speed of operation...
High-Q sapphire quasi-optical dielectric resonators (QDRs) excited on whispering-gallery modes are key techniques for accurate characterization in millimeter (mm) wavelength range of surface impedance of HTS large-area films and can be useful for impedance characterization of small HTS single crystals, including various unconventional superconductors. Hemispherical QDR-based technique for mm impedance...
The method of determination of permittivity of substances is presented with the use of a radiator with geometric-phase scanning. The conditions, providing minimization of errors at realization of measurements in the intermediate zone of radiation, are determined.
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