Patent ID: 8570153

Claim:
A metallic cover provided with an IC tag which is a metallic cover having a pull-tab, comprising: an IC chip for an IC tag to be mounted on said tab; an antenna for an IC tag; and a matching circuit for matching impedance between said antenna and said IC chip, wherein the matching circuit is set as a relationship between a real number part component {Re(Zma)} of an impedance (Zma) of said matching circuit, a real number part component {Re(Zic)} of an impedance (Zic) of the IC chip and a real number part component {Re(Zan)} of an impedance (Zan) of said tab is set to a relationship shown by the following formula (4) and a relationship between an imaginary number part component {Im(Zma)} of the impedance (Zma) of said matching circuit, an imaginary number part component {Im(Zic)} of the impedance (Zic) of the IC chip and an imaginary number part component {Im(Zan)} of the impedance (Zan) of said tab is set to a relationship shown by the following formula (5): Re ( Zma )= Re ( Zic )− Re ( Zan ) Formula (4) Im ( Zma )=− Im ( Zic )− Im ( Zan ). Formula (5)