| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem wherein an impedance is reduced at a joint between a wiring conductor on a circuit board and the center conductor of a coaxial connector, the reflection loss of high-frequency signals grows large, and a semiconductor device is apt to deteriorate its operating properties. SOLUTION: A cutout is provided to a part of the inner grounding conductor 2' of an insulating board 2 of a circuit board below a part of the center conductor 7c of the coaxial connector 7 connected to the wiring conductor 2a on the circuit board, and the length of a part of the center conductor 7c protruding into a frame 6 from the insulator 7b is set 1/4 or below as long as the wavelength of high-frequency signals. An impedance can be effectively restrained from varying at the joint between the wiring conductor 2a and the center conductor 7c. A resonance hardly occurs inside a part of the center conductor 7c protruding from the insulator 7b, so that the reflection loss of high-frequency signals can be much reduced, and a semiconductor device such as an optical semiconductor device 8 or the like can be improved in operation properties. COPYRIGHT: (C)2004,JPO |
