RFID tag, RFID system, and package including RFID tag

A radio frequency identification tag configured to be attached to a metal member including a slit or a. groove, the radio frequency identification tag comprising:

• a first conductive member configured to be a ached to a surface of the metal member at one side of the slit or the groove in a width direction of the slit or the groove through a first isolator;
• a second conductive member configured to be attached to the surface of the metal member at the other side of the slit or the groove in the width direction of the slit or the groove through a second isolator;
• and
• an integrated circuit (IC) chip configured to receive power through the first conductive member and the second conductive member,
• wherein, when a frequency of radio waves that is utilized for communication is denoted by f, the power induced between the one side and the other side of the slit or the groove by receiving the radio waves is denoted by Wa, voltage induced between the one side and the other side of the slit or the groove by receiving the radio waves is denoted by V, a first area of the first conductive member is denoted by S1, a second area of the second conductive member is denoted by S2, a first thickness of the first isolator is denoted by d1, a second thickness of the second isolator is denoted by d2, a first dielectric constant of the first isolator is denoted by ∈r1 a second dielectric constant of the second isolator is denoted by ∈r2, a dielectric constant of vacuum is denoted by ∈0, and a minimum value of the power required for the IC chip to operate is denoted Wmin, a first inequality Wmin ≦Wa -4πf·S1·∈0·∈r1 ·V2/d1 and a second inequality Wmin ≦Wa -4πf·S2·∈0·∈r2·V2/d2 are satisified,
• wherein the first area S1 of the first conductive member is equal to the second area S2 of the second conductive member,
• the first thickness d1 of the isolator is equal to the second thickness d2 of the second isolator, and
• the first dielectric constant ∈r1 of the first isolator is the same as the second dielectric constant ∈r2 of the second isolator.