Invention Grant
US08410938B2 RFID tag located on metallic surfaces that have an increased communication range
失效
位于金属表面上的RFID标签具有增加的通信范围
- Patent Title: RFID tag located on metallic surfaces that have an increased communication range
- Patent Title (中): 位于金属表面上的RFID标签具有增加的通信范围
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Application No.: US12043595Application Date: 2008-03-06
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Publication No.: US08410938B2Publication Date: 2013-04-02
- Inventor: Isao Sakama
- Applicant: Isao Sakama
- Applicant Address: JP Tokyo
- Assignee: Hitachi, Ltd.
- Current Assignee: Hitachi, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Mattingly & Malur, PC
- Priority: JP2007-103791 20070411
- Main IPC: G08B13/14
- IPC: G08B13/14
Abstract:
An RFID tag includes a first antenna on which an IC chip is mounted and a second antenna extending from an end of the first antenna in a direction at right angles to the first antenna. The first antenna has an arbitrarily electrical length and the second antenna has an electrical length of λ/2 or an integral multiple of λ/2. A resin base film having a thickness of approximately 50 μm is disposed on the back side of the first antenna and the second antenna. With this configuration of a tag antenna, the second antenna resonates with the first antenna to exhibit a radio wave amplifying effect. Therefore, a long communication distance can be achieved even if the electrical length of the first antenna is chosen to be short or the thickness of the base film is chosen to be thin.
Public/Granted literature
- US20080252462A1 RFID TAG Public/Granted day:2008-10-16
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