Antenna device and wristwatch type electronic device
AssigneeCasio Computer Co., Ltd.
InventorsKazunori Kita, Hiroshi Katsuda, Hiroaki Otsubo
Life of this patent
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Abstract
An antenna device includes a parasitic antenna which is a metal member used as a windshield fixing frame of a wristwatch type electronic device, and a feed antenna which is a conductor. The parasitic antenna has an annular shape, and is disposed close to the feed antenna, and is electromagnetically or capacitively coupled with the feed antenna, and acts as a parasitic antenna to which power is fed from the feed antenna in a non-contact manner, and thereby the feed antenna and the parasitic antenna act in cooperation with each other as a circular polarized antenna for receiving radar waves which are circularly polarized waves having a predetermined wavelength.
Claims20
An antenna device comprising:
- a metal member which is used as a windshield fixing frame of a wristwatch type electronic device;
- and
- a feed antenna which is a conductor, wherein
- the metal member has an annular shape, is disposed adjacent to the feed antenna, is electromagnetically or capacitively coupled with the feed antenna, and acts as a parasitic antenna to which power is fed from the feed antenna in a non-contact manner,
- the feed antenna and the metal member act in cooperation with each other as a circular polarized antenna for receiving radar waves which are circularly polarized waves having a predetermined frequency,
- the feed antenna includes an antenna element extending in an arc in an extension direction and a connection part configured to connect the antenna element and a GND, and
- a sum of a length of the antenna element in the extension direction and a length of the connection part is longer than a perimeter of the metal member that acts as the parasitic antenna.
Dependencies are inferred from the claim text.