Patent ID: 6751489
Filing Date: 2004-06-15
Classification: H01P,Y10S

Abstract:
A high temperature superconductor mini-filter comprising:(a) a substrate having a front side and a back side; (b) at least two self-resonant spiral resonators in intimate contact with the front side of the substrate, each of said resonators independently comprising a high temperature superconductor line oriented in a spiral fashion (i) such that adjacent lines are spaced from each other by a gap distance which is less than the line width; and (ii) so as to provide a central opening within the spiral resonator, the dimensions of which are approximately equal to the gap distance; (c) at least one inter-resonator coupling; (d) an input coupling circuit comprising a transmission line with a first end thereof connected to an input connector of the filter and a second end thereof coupled to a first one of the at least two self-resonant spiral resonators; (e) an output coupling circuit comprising a transmission line with a first end thereof connected to an output connector of the filter and a second end thereof coupled to a last one of the at least two self-resonant spiral resonators; (f) a blank high temperature superconductor film disposed on the back side of the substrate as a ground plane; (g) a conductive film disposed on the blank high temperature superconductor film as the contact to a case for said mini-filter; (h) a superstrate having a front side and a back side, wherein the front side of the superstrate is positioned in intimate contact with the at least two resonators disposed on the front side of the substrate; (i) a second blank high temperature superconductor film disposed at the back side of the superstrate as a ground plane; and (j) a second conductive film disposed on the surface of said second high temperature superconductor film as a contact to said case for said mini-filter wherein the superstrate is smaller in size than the substrate; andwherein the first end of the input coupling circuit and the first end of the output coupling circuit are each located outside the dimensions of the superstrate.