Lumped element filters

摘要

Thin film epitaxial high temperature superconductors are patterned to form lumped capacitors and inductors on low loss substrates. A ground plane (20), preferably of high temperature superconductive materials or high conductivity materials, such as gold or copper is placed on the substrate opposite to the patterned elements. Various structures such as a planar spiral conductor (24), or a zig-zag or serpentine conductor (42) can be formed. Additional structures such as narrow band reject filters (52) and bandpass filters can be formed. Chebyshev, elliptic and quasi-elliptic filters can be formed from a plurality of band-reject structures (116). Similarly, quasi-elliptical bandpass filters using a plurality of series connected bandpass structures with planar cross-couplings (134, 136, 138) can be formed.