Patent ID: 6700456
Filing Date: 2004-03-02
Classification: H01L,H01P

Abstract:
A high-frequency module comprising:a laminate ceramic layer including a first layer smaller in area than other layers, parts constituting high-frequency circuitry being mounted on said laminate ceramic layer; an interface substrate juxtaposed to said first layer and connecting said high-frequency circuitry and a waveguide; a metallic casing supporting said laminate ceramic substrate and said interface substrate with ground held in contact, said metallic casing being formed with at least one waveguide hole; and a cover covering said waveguide hole and forming a waveguide end cavity; wherein said interface substrate is positioned on a second layer of said laminate ceramic substrate, which just underlies said first layer, at one side and protrudes from said metallic casing into said waveguide hole at the other side, a high-frequency wave generated by said high-frequency circuitry is guided to said waveguide by a transmission line pattern formed on said interface substrate connected to a transmission line pattern of said laminate ceramic substrate corresponding to said waveguide hole, while a high-frequency wave input from said waveguide is guided to said high-frequency circuitry by said transmission line pattern of said interface substrate, and a GND pattern formed on the one side of said interface substrate contacts a GND pattern formed on a top of said second layer.