| 摘要 |
PURPOSE:To prevent leakage of high frequency from a bias terminal by arranging a circuit board near a bias terminal at the outside of a metallic airtight package containing a dielectric base and a transistor chip or the like and connecting the bias terminal to the bias supply source via a choke circuit provided to the circuit board. CONSTITUTION:The vicinity of bias terminals 10-13 of the metallic airtight package 1 in which dielectric bases 4-6 forming a matching circuit, transistor chips 7, 8 and a chip capacitor 9 or the like are contained is prolonged and a mount base 24 is provided and a circuit board 25 comprising an integrated circuit board or a printed circuit board is arranged to the mount base 24. Then a part of conductive film is subjected to patterning into a required length to constitute a tip short-circuit choke circuit 26 on the circuit board 25 and the choke circuit 26 is connected to the bias terminal 10. Thus, the high frequency in the metallic airtight package 1 is cut off by the choke circuit 26 and the leakage of high frequency through the bias terminal is prevented.
|
