Patent ID: 7295085
Filing Date: 2007-11-13
Classification: H01P

Abstract:
1. A process for producing high temperature superconductor mini-filters, spiral resonators or self-resonant coils on batches of single crystal substrates, each high temperature superconductor device comprised of a high temperature superconductor line oriented in a spiral fashion, the process comprising, for each batch: (a) depositing an epitaxial layer of CeO (b) forming an epitaxial high temperature superconducting film on the layer of CeO (c) coating the high temperature superconducting film with a photoresist; (d) exposing the photoresist to ultraviolet light through a photomask containing a pattern for one or more devices wherein each device contains a spiral line; (e) developing the photoresist to produce the pattern; (f) using an argon beam, etching away the high temperature superconductor exposed when the photoresist was developed; and (g) using an oxygen plasma, removing the remaining photoresist to expose the one or more high temperature superconductor devices, the presence of the epitaxial layer of CeO whereby a high percentage of the mini-filters, spiral resonators or self-resonant coils produced in each batch exhibit acceptable performance properties despite the presence of variations in substrates from batch to batch.