Wireless tag and method for producing wireless tag
The wireless tag includes an antenna conductor; a first power-supply conductor which is electromagnetic-inductively coupled with the antenna conductor; and a second power-supply conductor which is loop-shaped and which is electrically coupled with the first power-supply conductor.
1. A wireless tag comprising:
an antenna conductor;
a first power-supply conductor which is electromagnetic-inductively coupled with the antenna conductor; and
a second power-supply conductor which is loop-shaped and which is electrically coupled with the first power-supply conductor.
2. The wireless tag according to claim 1 , wherein the first power-supply conductor has a form of a dipole antenna or a monopole antenna.
3. The wireless tag according to claim 1 , wherein the antenna conductor, the first power-supply conductor, and the second power-supply conductor are arranged at a first surface of a dielectric substrate.
4. The wireless tag according to claim 1 , wherein
the antenna conductor is arranged at a first surface of a dielectric substrate; and
the first power-supply conductor and the second power-supply conductor are arranged at a second surface of the dielectric substrate.
5. The wireless tag according to claim 1 , further comprising a reinforcement member which covers the first power-supply conductor and the second power-supply conductor in avoidance of the antenna conductor.
6. The wireless tag according to claim 1 , wherein the electrical length of a part of the first power-supply conductor which part is electromagnetic-inductively coupled with the antenna conductor is set to be equal to or less than the half of a wavelength of a signal transceived by the antenna conductor.
7. The wireless tag according to claim 1 , wherein the electrical length of the second power-supply conductor is shorter than a wavelength of a signal transceived by the antenna conductor.
8. A method for producing a wireless tag, the method comprising:
forming an antenna conductor;
forming a first power-supply conductor which is electromagnetic-inductively coupled with the antenna conductor; and
forming a second power-supply conductor which is loop-shaped and which is electrically coupled with the first power-supply conductor.
9. The method according to claim 8 , wherein impedance matching between the antenna conductor and an integrated circuit, with which the first power-supply conductor and the second power-supply conductor are electrically coupled, is controlled by varying an electrical length of a part of the first power-supply conductor which part is electromagnetic-inductively coupled with the antenna conductor.
10. The method according to claim 8 , wherein impedance matching between the antenna conductor and an integrated circuit, with which the first power-supply conductor and the second power-supply conductor are electrically coupled, is controlled by varying an electrical length of the second power-supply conductor.