Design of trimmingless narrowband planar HTS filters

The use of high temperature superconductor (HTS) films provides a higher se lectivity of planar filters. The lower out-of-band interference increases t he sensitivity of receiving systems and allows reduction of transmitter rad iated power. Our goal was to show how these filters can be designed with a desired accuracy, and to give evidence for a real possibility of designing the trimmingless planar HTS filters. The analysis of tilter performance is based on accurate models of the characteristics of the HTS planar transmiss ion lines. The HTS film and substrate characteristic tolerance sensitivity is investigated. The design procedure of the trimmingless filter is propose d. Mass production of such filters requires a specific certification of the substrate materials and HTS films used.