Title:
ANTENNA DEVICE AND ELECTRONIC APPARATUS
Document Type and Number:
WIPO Patent Application WO/2021/039332
Kind Code:
A1
Abstract:
An antenna device (101) is provided with a coupling element (30) including a first coil (L1) and a second coil (L2), a power-feeding radiation element (10), and a parasitic radiation element (21). A series circuit of the first coil (L1) and a power-feeding circuit (1) is connected to the power-feeding radiation element (10), and the parasitic radiation element (21) is connected to the second coil (L2). A distance (m2) between an open end (21E) of the parasitic radiation element (21) and an open end (12E) of a short-length section (12) of the power-feeding radiation element (10) is shorter than a distance (m1) between the open end (21E) of the parasitic radiation element (21) and an open end (11E) of a long-length section (11) of the power-feeding radiation element (10). The antenna device (101) is used as an antenna for a first frequency band by fundamental wave resonance of the long-length section (11) and fundamental wave resonance of the parasitic radiation element (21), and is used as an antenna for a second frequency band, which is higher than the first frequency band, by high-order resonance of the parasitic radiation element (21) and resonance of the short-length section (12).
Inventors:
NASU TAKAFUMI (JP)
Application Number:
PCT/JP2020/030063
Publication Date:
March 04, 2021
Filing Date:
August 05, 2020
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H01Q1/24; H01Q1/44; H01Q1/50; H01Q5/371; H01Q5/378; H01Q9/30
Domestic Patent References:
| WO2018101284A1 | 2018-06-07 | |||
| WO2012153690A1 | 2012-11-15 |
Foreign References:
| JP2012109875A | 2012-06-07 |
Attorney, Agent or Firm:
KAEDE PATENT ATTORNEYS' OFFICE (JP)
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