Title:
ANTENNA DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/137375
Kind Code:
A1
Abstract:
An antenna device (101) includes a first antenna (10) and a second antenna (20). A first radiating element (11) and a second radiating element (12) have portions that run parallel to each other. A first coil (L1) is connected between the first radiating element (11) and a first power-supply-circuit connection section (19). A second coil (L2) is connected between the second radiating element (12) and a ground conductor (GND). The first coil (L1) and the second coil (L2) are subtractive-polarity coupled to each other. The second antenna (20) has a communication frequency band different from that of the first antenna (10). A phase adjusting circuit (14) causes the phase difference between electrical currents flowing in the first radiating element (11) and the second radiating element (12) to fall in the range of 90° inclusive to 180° exclusive in the communication frequency band of the second antenna (20). Furthermore, f1 > f2 and 3f1-f2 > f1-f2 are satisfied, where f1 is the frequency of the fundamental wave of the first radiating element (11), and f2 is the frequency of the fundamental wave of the second radiating element (12).
Inventors:
TACHIBANA SHINYA (JP)
NASU TAKAFUMI (JP)
NASU TAKAFUMI (JP)
Application Number:
PCT/JP2019/047118
Publication Date:
July 02, 2020
Filing Date:
December 03, 2019
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H01Q5/10; H01Q5/307; H01Q5/328; H01Q5/335; H01Q5/371; H01Q5/378; H01Q9/14; H01Q9/30; H01Q9/42
Domestic Patent References:
| WO2012153690A1 | 2012-11-15 | |||
| WO2014034587A1 | 2014-03-06 | |||
| WO2018101284A1 | 2018-06-07 |
Attorney, Agent or Firm:
KAEDE PATENT ATTORNEYS' OFFICE (JP)
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