| 摘要 |
PROBLEM TO BE SOLVED: To match with the impedance of the input/output pin of IC of a small pin interval by lowering the impedance, when the conductor pattern width of a substrate is limited. SOLUTION: A conductor (ground) pattern 7 on the lower surface of the part of IC4 of the substrate 1 of a glass resin, etc., is removed, and this part is fitted to a housing 8 by inserting the substrate consisting of ceramic, etc. A substrate 10 is removed of a part corresponding to an IC4 of a conductor pattern 11 on its top surface. Thereby, the dielectric constant is increased by the total sum of the substrates 1 and 10, so that the impedance of conductor patterns 2 and 3 can be lowered, to match with the input/output impedance of IC4 even if the widths of the patterns 2 and 3 to be connected are small. |
