Patent ID: 7876277

Claim:
An adjustable antenna coil comprising: first and third conductor lines forming a first pair, extending in a first direction along a predetermined substrate surface and formed with a gap therebetween; second and fourth conductor lines forming a second pair, extending along the substrate surface in a direction crossing the first and third conductor lines and formed with a gap therebetween; a plurality of corner portions interconnecting one end of the first conductor line and one end of the second conductor line, the other end of the second conductor line and one end of the third conductor line, and the other end of the third conductor line and one end of the fourth conductor line, thereby forming a conduction path having a loop shape with at least four sides; and a trimming line formed on an inner side of the conduction path along one of the plurality of corner portions so as to interconnect two sides adjacent via the one corner portion on the conduction path, wherein the trimming line is formed outside an imaginary rectangle formed by connecting midpoints of individual sides of the conduction path on the substrate surface.