| 摘要 |
PURPOSE:To simplify the manufacture by forming a ground conductor with a thick film circuit and a transmission line with a thin film circuit in a microwave strip circuit so as to form the ground conductor to the inner wall of a through- hole of a substrate. CONSTITUTION:The through-hole 25 is formed in advance to the dielectric substrate 21 made of alumina ceramic. The ground conductor 22 is formed on the dielectric substrate 21 by printing and baking the thick film paste. The thick film paste is adhered to the inner wall 27 around the through-hole 25 by decreasing the pressure through the evacuation of air from the surface at printing. Vapor-deposition or sputtering is applied to a face forming the transmission line 23 so as to form the thin film layer 28. Since a metallic layer is given to the inside of the through-hole 25, electric connection is attained between a connection conductor 29 and the thin film layer 28. |
