| 摘要 |
PROBLEM TO BE SOLVED: To provide a substrate having a high speed transmission characteristic at a low cost as to a printed circuit board structure for high speed transmission. SOLUTION: The substrate has a structure which causes electric field concentration in a small dielectric loss layer and a small conduction loss layer to secure the size precision of a printed board signal circuit and minimize the transmission loss. COPYRIGHT: (C)2005,JPO&NCIPI
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