Patent ID: 8665167

Claim:
A method for reducing a resistance comprising: reducing an electrical resistance of an antenna circuit to be disposed to a transponder, storing various data in a readable and/or writable manner and having a communication function, for a carrier frequency of 13.56 MHz, wherein the antenna circuit includes: a prescribed base material that is a printed wiring board; and two antenna conductors, each of which is formed of a same prescribed conductor pattern forming an antenna coil, formed on respective front and back surfaces of the base material by an electrically parallel connection, wherein the overall thickness formed of the two antenna conductors and the base material is greater than or equal to 0.1 mm and less than or equal to 1.0 mm, wherein each of the two antenna conductors has a thickness arranged to be greater than or equal to 5% and less than 50% of an overall thickness formed of the two antenna conductors and the base material.