Antenna device and wireless device

摘要

An RFID tag includes an antenna element and a feed device. The antenna element includes a base sheet and a coil conductor on the upper surface thereof. The feed device includes a feed element and an RFIC. The feed element includes a base sheet and a first coil conductor and a second coil conductor on the upper surface of the base sheet. The first coil conductor and the second coil conductor are arranged on the base sheet such that magnetic flux generated in the first coil conductor and the second coil conductor constitutes a closed magnetic circuit. The feed device is adhered to a coupling portion of the antenna element. As a result, the RFIC is strongly coupled to the antenna element.

主权项

1. An antenna device comprising:
an antenna element including a coupling portion; and a feed element including a first coil conductor and a second coil conductor, the first coil conductor and the second coil conductor being arranged such that magnetic flux generated in the first coil conductor and the second coil conductor constitutes a closed magnetic circuit; wherein the feed element and the antenna element are arranged such that the closed magnetic circuit of the feed element extends around the coupling portion of the antenna element; the antenna element includes a spiral or loop-shaped coil conductor; the coupling portion is part of the spiral or loop-shaped coil conductor; and the feed element is disposed across the coupling portion of the antenna element such that the first coil conductor and the second coil conductor are positioned on respective sides of the coupling portion.