发明授权
US07423606B2 Multi-frequency RFID apparatus and methods of reading RFID tags
有权
多频RFID设备和阅读RFID标签的方法
- 专利标题: Multi-frequency RFID apparatus and methods of reading RFID tags
- 专利标题(中): 多频RFID设备和阅读RFID标签的方法
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申请号: US10957529申请日: 2004-09-30
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公开(公告)号: US07423606B2公开(公告)日: 2008-09-09
- 发明人: Richard T. Knadle, Jr. , Hal Charych , Mark William Duron , Raj Bridgelall
- 申请人: Richard T. Knadle, Jr. , Hal Charych , Mark William Duron , Raj Bridgelall
- 申请人地址: US NY Holtsville
- 专利权人: Symbol Technologies, Inc.
- 当前专利权人: Symbol Technologies, Inc.
- 当前专利权人地址: US NY Holtsville
- 代理机构: Ingrassia Fisher & Lorenz, P.C.
- 主分类号: H01Q5/02
- IPC分类号: H01Q5/02 ; H04Q5/22
摘要:
A portable/handheld device is provided having a processing module configured to selectively operate a reading mode selected from a far-field mode and a near-field mode, and a directional antenna array coupled to the processing module. The directional antenna array includes a first antenna element configured to radiate electromagnetic (EM) radiation in a far-field, and a second antenna element coupled to the first antenna element. The second antenna element is configured to radiate EM radiation in a near-field. The second antenna element includes an antenna transducer configured to selectively cancel far-field EM radiation from the first antenna element. A method of reading inductively coupled radio frequency identification (RFID) tags is also provided having the steps of scanning at least one frequency band to detect a RFID tag, and selectively radiating one of a near-field electromagnetic (EM) field and a far-field EM field based on the detected RFID tag.
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