Patent ID: 7310030
Filing Date: 2007-12-18
Classification: H01P

Abstract:
1. A ring millimeter-wave filter made by a low-temperature cofired ceramic multi-layer process, said ring millimeter-wave filter comprising: a signal input electrode for receiving an external signal to be processed; a signal output electrode for outputting said processed signal; at least two coupling capacitors, the magnitudes of coupling capacitance of said at least two coupling capacitors being determined according to overlap areas of respective upper metal microstrip lines formed on an outer surface of the filter and corresponding lower metal layer portions embedded therebeneath, said upper microstrip lines being electrically connected with said signal input electrode and said signal output electrode, respectively; an embedded microstrip line ring connected to said respective lower metal layer portion, said signal being coupled from said signal input electrode to said embedded microstrip line ring or from said embedded microstrip line ring to said signal output electrode via said at least two coupling capacitors; and a perturbation source located intermediately between said signal input electrode and said signal output electrode along said embedded microstrip line ring.