Patent ID: 6873230

Claim:
A high-frequency wiring board comprising: a dielectric substrate; a first line conductor formed on one principal surface of the dielectric substrate; a second line conductor formed on another principal surface of the dielectric substrate, with its one end arranged face to face with one end of the first line conductor; a through conductor piercing through the dielectric substrate, for providing electrical connection between the one ends of the first and second line conductors; a first coplanar ground conductor formed around the one end of the first line conductor of the one principal surface at a predetermined interval; and a second coplanar ground conductor formed around the one end of the second line conductor of the other principal surface at a predetermined interval, wherein the following relationship holds: S<H /2 in which S represents an interval between the first line conductor and part of the first coplanar ground conductor located around each side of the first line conductor, as well as an interval between the second line conductor and part of the second coplanar ground conductor located around each side of the second line conductor, and H represents a distance between the first line conductor and the second coplanar ground conductor facing each other via the dielectric substrate, as well as a distance between the second line conductor and the first coplanar ground conductor facing each other via the dielectric substrate.