| 摘要 |
PURPOSE:To stably operate a high frequency hybrid integrated circuit by covering a high frequency circuit with a metal film coated on a cap and metal conductors to become an earth surface to simplify working steps, thereby readily shielding the circuit. CONSTITUTION:A circuit board 2 composed of a high frequency circuit is entirely enclosed with metal conductors 1 to become an earth surface, a metal film 4 covered on a plastic cap 3 and a conductive adhesive 5 for connecting therebetween to be electrically shielded from the exterior. As a result, even when a metal plate is covered to be, for example, hermetically sealed from the exterior by the hybrid integrated circuit, the circuit is not affected by any influence but stably operated. Particularly, large effect is obtained in a high frequency high output hybrid integrated circuit and a filter circuit for handling large power in high frequency. |
