HTS Microstrip Resonators Excited on WGM and Fundamental Mode: Q-Factor

For effective technological implementation of HTS-based microstrip resonators, it is of practical interest to study and to compare the dissipative properties of two types of such resonators: excited on whispering gallery modes (WGM) and resonators excited at the fundamental frequency. The analysis was performed in the frequency range from 1.5 GHz to 40 GHz. By using numerical simulation of partial Q-factors it is shown that the value of Q-factor at a temperature of 77 K and lower for the YBa2Cu3O7-delta - based WGM resonator without housing exceeds the Q-factor for the resonator exited with a fundamental mode with housing in the frequency range from 1.5 to 35 GHz. This is an important practical result. The experimental data and the results of numerical simulations are mutually consistent. In the millimeter wavelength range, when the dimensions of traditional resonators become unacceptably small, it will be more convenient to use microstrip WGM resonators.