Modeling and experimental investigation of microstrip resonators and filters based on High-Temperature Superconductor films

Miniature coaxial resonator and related bandpass filter with ultra-wide stopband

“…Unfortunately, microstrip resonators possess relatively low Q that hinders the creation of narrow band filters with low loss in the passband. This problem can be solved by using high temperature superconductor films [1,5,6], but their application requires special cooling systems.…”