Principal problems of quality improvement for high-speed planar transmission lines issued from studies of high-Q microstrip resonators

摘要

Possible approaches to improvement of quality of a high-speed planar transmission line are investigated by systematic study of superconductor high-Q microstrip resonators in the frequency range of order 10 GHz. Superconductor microstrip resonators with maximal highest quality-factors Q>10~5 were constructed. Relative contributions of spectral (geometrical and non-dissipative material properties), on one hand, and of dissipative (losses in materials) characteristics, on another hand, into the limitation of maximal achievable values of the quality of microstrip resonators are investigated. It is shown that the highest by now Q≥10~6 are limited dominantly by the spectral properties of microstrip resonators.