| 摘要 |
PROBLEM TO BE SOLVED: To enable high-precision impedance matching, to eliminate high-frequency inconsistency, and to reduce the reflection loss of a high-frequency signal further. SOLUTION: This board is equipped with a high-frequency input/output part where ground conductors 4 and 7 of both coplanar lines 5 and 8 are electrically connected to each other by a through conductor 10 electrically connected to internal-layer ground conductors 9a and 9b of two layers at positions of 0.1 to 5 mm on both sides in the direction crossing the 1st and 2nd coplanar lines 5 and 8 at right angles from the through conductor 10; and the ground through conductor is composed of an upper ground through conductor 11a which connects the ground conductor 4 and internal-layer ground conductor 9b right below it, a lower ground through conductor 11b which connects the ground conductor 7 and the internal-layer ground conductor 9b right above it, and an intermediate part ground through conductor 14 which connects the internal-layer ground conductors 9a and 9b to each other and the intermediate-part ground through conductor 14 is closer to the through conductor 10 than the upper ground through conductor 11a and lower ground through conductor 11b. |
