| 摘要 |
PURPOSE:To increase a frequency band to be used by suppressing a cavity resonance by inserting an electromagnetic wave absorption material to a frame part of a package. CONSTITUTION:A cavity part 701 and a sheetlike electromagnetic wave absorption material 401 provided with a placing part of a lead 601 to become input/ output parts of a microwave signal are formed on a metal base 501. Then, the material 401 is coated with pastelike metal 201, and laminated in a necessary thickness to form a frame 101. Then, in order to maintain a potential of the metal in the frame constant, the surface of the frame is coated with pastelike metal, and simultaneously burned. Eventually, an insulator board 901 and a lead 601 formed with a microwave signal input/output signal line conductors 801 are mounted. When the package formed as above is used, distributions of an electric field and a magnetic field in the cavity are suppressed to eliminate a resonance. |
