Title:
ANTENNA DEVICE
Document Type and Number:
Japanese Patent JP2020188520
Kind Code:
A
Abstract:
To provide an antenna device capable of suppressing fluctuation in a Q value due to change in temperature even with a simple structure.SOLUTION: An antenna device 10C comprises an interval maintenance part 91C for defining an interval between eddy current-generating means 110C disposed on an outer peripheral side of a core 20C and a coil 50C, and the core 20C. In the case where the antenna device does not include the eddy current-generating means, a first Q value showing sharpness of a peak of resonance caused by the coil 50C decreases with rise in temperature based on temperature change of a resistance value of a conducting wire 51C. In the case where the antenna device includes the eddy current-generating means, a second Q value showing sharpness of a peak of resonance by the eddy current-generating means increases with the rise in temperature due to current fluctuation corresponding to temperature change of a resistance value of the eddy current-generating means. In addition, rate of change in temperature rise of an adjustment Q value showing the sharpness of the peak of resonance based on the coil 50C and the eddy current-generating means is smaller than rate of change in temperature rise of the first Q value, and rate of change in temperature rise of the second Q value.SELECTED DRAWING: Figure 12
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Inventors:
TANAKA KEI
KIKUCHI SHUICHI
ROKUKA TAKANOBU
KIKUCHI SHUICHI
ROKUKA TAKANOBU
Application Number:
JP2020140806A
Publication Date:
November 19, 2020
Filing Date:
August 24, 2020
Export Citation:
Assignee:
SUMIDA CORP
International Classes:
H01Q7/06
Domestic Patent References:
| JP2008187337A | 2008-08-14 |
Foreign References:
| WO2008010329A1 | 2008-01-24 |
Attorney, Agent or Firm:
Iat International Patent Business Corporation