HIGH-FREQUENCY DIELECTRIC CAVITY AND SOLUTION FOR ITS CHEMICAL COPPER PLATING Russian patent published in 1997 - IPC

FIELD: high-frequency radio engineering; filters with passband of hundreds and more megahertz. SUBSTANCE: high-frequency dielectric cavity has hollow cylindrical ceramic base plated with copper layer with protective conducting nickel layer applied on it; novelty is that ceramic base is of % composition, copper layer thickness is 1.7-1.9 mcm, and nickel layer thickness is 0.4-0.6 mcm. Chemical copper plating solution is characterized in that it has the following composition, g/l: copper sulfate - 10-15; Seignette salt - 50-60; sodium hydroxide - 10-15; nickel chloride - 2-3; sodium carbonate - 2-3; sodium thiosulfate - 0.5-1.0 mg/l; formalin - 10-15 ml/l. EFFECT: reduced cost and facilitated procedure. 2 cl, 1 tbl