Wireless IC device
AssigneeMurata Manufacturing Co., Ltd.
InventorsNoboru Kato, Yuya Dokai
Life of this patent
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Abstract
A wireless IC device has a structure such that the size of a radiation plate and a radiation characteristic may be determined irrespective of an impedance of a wireless IC chip. The wireless IC device includes a wireless IC chip that is arranged to process transmission and reception signals, a spiral matching inductance element and a plane electrode that are located on a surface of a feeder circuit substrate, and a coil-shaped radiation plate located on a radiation substrate. Plane electrodes connected to both ends of the radiation plate are electromagnetically coupled respectively to the inductance element and the plane electrode. The wireless IC chip is operated by a signal received by the radiation plate, and a response signal from the wireless IC chip is radiated outside from the radiation plate.
Claims16
A wireless IC device comprising:
- a wireless IC arranged to process transmission and reception signals;
- a feeder circuit including an inductance electrode and a plane electrode;
- and
- a radiation member including a first end portion and a second end portion;
- wherein
- the wireless IC is connected to the feeder circuit;
- the first end portion of the radiation member is magnetically coupled to the inductance electrode of the feeder circuit, and the second end portion of the radiation member is capacitively coupled to the plane electrode of the feeder circuit;
- the wireless IC is mainly magnetically coupled to the first end portion of the radiation member via a first connection electrode connected to the inductance electrode of the feeder circuit;
- the wireless IC is mainly capacitively coupled to the second end portion of the radiation member via a second connection electrode connected to the plane electrode;
- the wireless IC is arranged to be operated by a signal received by the radiation member, and a response signal from the wireless IC is radiated outside from the radiation member;
- and
- the first end portion of the radiation member is defined by a first plane electrode that is arranged to face the inductance electrode.
Dependencies are inferred from the claim text.