A comparative study of YBa_2Cu_3O_7 microwave hairpin filters vs. aluminum microwave hairpin filters

摘要

We have fabricated microstrip hairpin bandpass filters using YBa_2Cu_3O_7 and aluminum on LaAlO_3. The insertion loss and bandwidth difference between the two identical (except for their conductor) devices has been used to estimate the unloaded Q of the aluminum resonators. The estimated unloaded Q of the aluminum resonators was 28. This is used to discuss why aluminum filters and resonators fabricated on silicon have not exhibited a response when YBa_2Cu_3O_7 resonators and filters fabricated on identical silicon substrates have shown results consistent with the loss tangent of the silicon substrate.