Antenna device and wireless device
AssigneeMurata Manufacturing Co., Ltd.
InventorNoboru Kato
Life of this patent
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Abstract
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.
Claims18
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.
A wireless 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.
Dependencies are inferred from the claim text.