Title:
SIGNAL SUPPLY DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/110844
Kind Code:
A1
Abstract:
A signal supply device (50; 50a) is provided with: a frequency adjustment unit (21, 22); a modulation unit (23); an amplification unit (24); a current measurement unit (25) that measures an antenna current; a frequency setting unit (27) that sets a use frequency to be used as a carrier wave frequency; and a control unit (21). The control unit measures an antenna current every time the carrier wave frequency changes while performing a test signal supply process for changing the carrier wave frequency within a prescribed frequency range which is the resonance frequency range of an antenna, modulating the carrier wave on the basis of a test signal, and amplifying the modulated carrier wave so as to supply, to the antenna, the resultant wave as a signal to be outputted. The frequency setting unit sets, as the use frequency, a frequency corresponding to an antenna current of a large one, among antenna currents measured during performance of the test signal supply process.
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Inventors:
MURAKAMI BUNSEI (JP)
Application Number:
PCT/JP2019/045342
Publication Date:
June 04, 2020
Filing Date:
November 20, 2019
Export Citation:
Assignee:
DENSO CORP (JP)
International Classes:
B60R25/24; H04B17/19; E05B49/00; H04B1/3822; H04B1/59
Domestic Patent References:
| WO2018037698A1 | 2018-03-01 |
Foreign References:
| JP2017183835A | 2017-10-05 | |||
| JP2012067499A | 2012-04-05 | |||
| JP2008224522A | 2008-09-25 | |||
| JPH09324566A | 1997-12-16 |
Attorney, Agent or Firm:
TOKKYO GYOMUHOJIN MEISEI INTERNATIONAL PATENT FIRM (JP)
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