A. Ye. Kogut

Excitation of whispering gallery modes in shielded dielectric resonators by “slot-line”

Open dielectric resonators (DRs) as disk and ball with whispering gallery modes (WGMs) have well known advantages such as a high value of Q-factor in millimeter band of wavelength. However they have disadvantages when used in specific devices and appliances. 1. The open nature of the dielectric resonator is a source of electromagnetic noise interference. The shielding of DRs is the main method of combating such injurious electromagnetic effects. However, the shielding causes a significant concentration of the oscillation spectrum. At the same time the so-called ray modes can be excited in the shielded DRs with the WGMs. 2. It is known that the use of local elements of excitation placed in the resonator field is the most effective method for excitation of the WGMs in the DRs. However, in this case, the Q-factor is decreased due to high radiation losses at the local element of mode excitation. The solution of these two problems is the aim of this work.

Cavity method for determination of dielectric characteristics of fine granular materials in 8-mm range of wavelengths

A resonator method and results of investigation of dielectric characteristics of bulk materials in the 8-mm range of wavelengths are presented. Accuracy of experimental estimation of dielectric constant and loss-angle tangent δ of mixture of sand and cement are investigated in the process of manufacturing of a dielectric resonator from the probed material and exciting on modes of “whispering gallery”.