Screened dielectric resonators with azimuthal oscillation

Conclusions

The results presented above qualitatively and quantitatively characterize the basic properties of an SDR operating in an AO mode. From the physical point of view the most characteristic property of the functioning of such resonators is the unusually strong effect, hitherto uninvestigated, of blocking of the field within the dielectric, which is similar in nature to the phenomenon of high-Q-factor resonance in an ODR operating in an AO mode. This effect appears as a result of the fact that, first, even for small values of ε due to the specific field structure of the AO with sufficiently large n there is a weak leakage of energy through the cylindrical boundary of the dielectric and, second, as a result of the damping interference of the fields reflected back and forth in the open-air region between the dielectric and the screen, at a certain distance between them there is a strong weakening of the external field. Using the terminology of [1] we can say that the SDR oscillation is divided into high-Q-factor oscillation of the dielectric type and low-Q-factor oscillation of the open-air type. Precisely this circumstance, noted in [13] with regard to open resonators with a dielectric prism, is the basis of the thinning of the SDR spectrum. The degree of thinning depends on the material and design of the screen, and precisely this gives the possibility of further optimization of the SDR parameters.

From the practical point of view it is necessary to note that screening of the DR and selection of design parameters taking into account the physics of the SDR's operation not only solve the problem of shielding the ODR, but also simultaneously improve a number of the resonator's qualitative indices, and in particular decrease the operating order of the oscillation, thin the spectrum, and decrease the size of the rod and screen. This is important for the solution of an entire series of applied problems in the uhf range, such as frequency stabilization, signal filtration, and a number of others.