Patent ID: 6998943

Claim:
A power amplifier comprising: a multilayer substrate including a plurality of laminated dielectric layers; a wiring prohibited area located on at least one of an obverse side and a reverse side of said multilayer substrate in which wiring is prohibited; a first strip conductor located within said multilayer substrate; a second strip conductor located within said multilayer substrate at a position, in a lamination direction of said multilayer substrate, different from that of said first strip conductor; a via electrically connecting said first strip conductor to said second strip conductor; and a first grounding conductor and a second grounding conductor disposed sequentially in the lamination direction of said multilayer substrate and sandwiching said first strip conductor and said second strip conductor, wherein said first grounding conductor includes: a first grounding conductor portion located in said wiring prohibited area; and a second grounding conductor portion located in an area other than said wiring prohibited area so that said second grounding conductor portion is positioned, with respect to the lamination direction of said multilayer substrate, at a position different from said first grounding conductor portion.