| 摘要 |
PURPOSE:To improve the accuracy of the characteristic impedance of a through- hole. CONSTITUTION:A through-hole 31 is composed of a first copper plating section 32 for a signal positioned at a center, a second copper plating section 34 surrounding the first copper plating section 32 and having ground potential and an insulator section 33 occupying a section between the first copper plating section 32 and the second copper plating section 34. The through-hole 31 constitutes coaxial cable structure. |
