Investigation of the HTS microstrip filters based on dual-mode ring resonators

The design and realization of the HTS dual-mode microstrip ring resonator narrow-band filters is presented. As a design tool LIBRA has been used. Two types of superconductors and substrates have been used: YBCO on sapphire and TBCCO on LaAlO/sub 3/. Two-pole Tchebyshev type filters and four-pole elliptic filters have been realized.