Invention Grant
- Patent Title: Antenna device and method of setting resonant frequency of antenna device
- Patent Title (中): 天线装置及天线设备谐振频率的方法
-
Application No.: US13941760Application Date: 2013-07-15
-
Publication No.: US09203157B2Publication Date: 2015-12-01
- Inventor: Noboru Kato , Katsumi Taniguchi , Jun Sasaki , Naoki Gochi
- Applicant: Murata Manufacturing Co., Ltd.
- Applicant Address: JP Kyoto
- Assignee: Murata Manufacturing Co., Ltd.
- Current Assignee: Murata Manufacturing Co., Ltd.
- Current Assignee Address: JP Kyoto
- Agency: Keating & Bennett, LLP
- Priority: JP2009-103358 20090421
- Main IPC: H01Q7/06
- IPC: H01Q7/06 ; H01Q1/38 ; H01Q1/22 ; H01Q19/02 ; H01Q7/04 ; H04B5/00 ; H01P11/00 ; H01Q1/36 ; H01Q1/48 ; H01Q1/52 ; H01Q19/06 ; G06K19/077 ; H01Q1/24

Abstract:
In antenna device, a coil conductor of an antenna coil module and a conductor layer at least partially overlap. A current flows in the conductor layer to block a magnetic field generated by a current flowing in the coil conductor. A current flows along the periphery of a slit and around the periphery of the conductor layer due to a cut-edge effect. Since magnetic flux does not pass through the conductor layer, magnetic flux attempts to bypass the conductor layer along a path in which the conductor opening of the conductor layer is on the inside and the outer edge of the conductor layer is on the outside. As a result, the magnetic flux generates large loops that link the inside and the outside of a coil conductor of an antenna on a reader/writer side to couple an antenna device and the antenna on the reader/writer side.
Public/Granted literature
- US20130300622A1 ANTENNA DEVICE AND METHOD OF SETTING RESONANT FREQUENCY OF ANTENNA DEVICE Public/Granted day:2013-11-14
Information query