A base sheet 12 has a structure that stably couples a particular chip measuring 1 mm or less on paper with an antenna line by only disposing the chip and antenna line in such a manner that the chip and antenna line are close to each other, without electrically bringing the chip and antenna line into contact with each other. The base sheet 12 includes a chip 11 having a spiral coil 13 with at least one turn disposed on a surface of the chip, or inside the chip and near the surface thereof and an antenna line 14 having a conductor part 14 A orbiting around the coil 13 A of the chip 11 or directly over or directly below the coil 13 A so that the conductor part is magnetically coupled with the coil 13 A. This base sheet has a structure that stably couples even a chip measuring 1 mm or less on paper or the like with an antenna line by only disposing the chip and antenna line in such a manner that the chip and antenna line are close to each other, without physically bringing the chip and antenna line into contact with each other.
1. A base sheet comprising:
a plurality of chips wherein each chip comprises a spiral or helical coil having at least one turn disposed on a surface of the chip, or inside the chip and near the surface; and
an antenna line including a conductor orbiting around the coil of the chip or directly above or directly below the coil, wherein the conductor is magnetically coupled with the coil;
wherein:
the chip comprises a semiconductor circuit configured to store wirelessly readable information;
the coil and the semiconductor circuit are electrically coupled to each other;
the conductor of the antenna line is meandering and is magnetically coupled with the coil; and
each chip of the plurality of the chips is configured to be magnetically coupled with the antenna line.
2. The base sheet according to claim 1 , wherein the antenna line is a dipole antenna.
3. The base sheet according to claim 1 , wherein the antenna line is a loop antenna.
4. The base sheet according to claim 1 , wherein a plurality of the antenna line are formed in layers of a multilayered structure.