Patent ID: 8743006

Claim:
A wireless communication-improving sheet member that is used between a wireless IC tag and a communication jamming member at the time of wireless communication with electric waves of a UHF band, an SHF band and an EHF band using an antenna for performing radio-wave-type communication near the communication jamming member, and that improves wireless communication properties of the wireless IC tag when the wireless IC tag is disposed on an arrangement face without a wired connection of an IC chip provided in the wireless IC tag and an auxiliary antenna, comprising: a first spacer having the arrangement face, the first spacer being made of a non-conductive material; the auxiliary antenna disposed on the first spacer on an opposite side to the arrangement face, the auxiliary antenna having a first conductor layer including a portion resonating with electromagnetic waves used in the wireless communication; a second spacer disposed on the auxiliary antenna on an opposite side to the first spacer with the first conductor layer interposed therebetween, the first spacer, the auxiliary antenna and the second spacer being stacked one on top of another; and a groove, an opening or a cutout being disposed in the first conductor layer of the auxiliary antenna, wherein a first side of the first conductor layer is in direct contact with a surface of the first spacer that is opposite the arrangement face and a second side of the first conductor layer is in direct contact with a surface of the second spacer opposite the arrangement face, the groove, the opening or the cutout passes through the first spacer and the auxiliary antenna in a stacked direction of the first spacer, the auxiliary antenna and the second spacer, and the second spacer forms a bottom of the groove, the opening or the cutout.