Patent ID: 8400237

Claim:
A circuit device comprising: a substrate; and a transmission line, wherein: the transmission line includes a dielectric film formed on the substrate, and a signal line formed on the dielectric film, the dielectric film includes a nano-composite film in which particles of a first material are dispersed in a second material, the transmission line includes periodically formed first and second regions, in plan view, the first regions and the second regions are different in impedance from each other, the transmission line includes a first conductor and second conductors, the dielectric film includes a first film and a second film, the first film is the nano-composite film formed on the second film, the first conductor is formed between the second film and the substrate, and the second conductors are periodically formed between the first film and the second film, so that each of the second regions includes a corresponding one of the second conductors and the first regions do not include any of the second conductors.