| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission line board which is improve in transmission characteristics and capable of reducing a drip caused by resonance without increasing component parts in number. SOLUTION: A transmission line board is equipped with a dielectric board 1, a conductor signal line 2 formed in a line on the top surface of the board 1, plate-like conductor ground planes 3 arranged so as to sandwich the signal line 2 from both sides through the intermediary space, and ground vias 4 which electrically cannot the ground planes 3 to the undersurface of the dielectric board 1. A distance from a virtual reference plane that passes through the center line of the signal line 2 and vertical to the top surface of the board 1 to the center line of the ground vias 4 connected to one of the ground planes 3, and another distance from the above virtual reference plane to the center line of the ground vias 4 connected to the other ground plane 3, are set different from each other. |
