ELECTRODE FORMING METHOD FOR DIELECTRIC RESONATOR

摘要

PURPOSE:To improve the weather resistance and the reliability of a dielectric resonator by forming a copper film on the dielectric ceramics by the electroless plating and then applying the nickel and/or gold plating to the copper film after applying a heat treatment to the film in a prescribed mixture gas atmosphere and at a prescribed temperature. CONSTITUTION:A copper film is formed on a cylindrical dielectric resonator ceramic element which contains a pierced hole 2 by the electroless plating. Then a heat treatment is applied to the copper film in a mixture gas atmosphere of hydrogen and nitrogen of 10<-20>-10<-4>ppm partial pressure of oxygen and at 500-700 deg.C. Then the nickel and or gold plating is applied to the copper film for production of an inner circumferential surface electrode 5 and an inner circumferential surface electrode 4.