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    • 9. 发明专利
    • Wireless authentication system
    • 空值
    • JP4919494B2
    • 2012-04-18
    • JP2007072926
    • 2007-03-20
    • パナソニック株式会社
    • 秀樹 武長真理 竹田武志 興梠秀生 鍋嶋
    • H04B1/59G06K17/00G06K19/07H04B5/02
    • Y02D70/00Y02D70/10Y02D70/40Y02D70/42
    • PROBLEM TO BE SOLVED: To prevent responders existing upstairs or downstairs, or at a side opposite to a wall from being detected erroneously even if an antenna where a symmetrical radiation pattern to a radiation surface is formed is used in a radio authentication system for allowing an interrogator to detect the responder by using the radio authentication system for the entering/leaving management in a room, the stock control of products, or the like, by allowing the interrogator to transmit a question signal, and by allowing the responder to return a response signal in response to the question signal. SOLUTION: When a detection area 35 can be set to the question signal relatively accurately and the responders 16A, 16B use an LF band for easily receiving the question signal, the radiation pattern symmetrical to the radiation surface is forcedly formed from the LF antenna 34. Accordingly, another LF antenna 41 is provided in the interrogator 31 for generating feeble interfering waves to the question signal, thus detecting only the responder 16A on an installation floor accurately without detecting the responder 16B on a lower floor erroneously. COPYRIGHT: (C)2009,JPO&INPIT
    • 要解决的问题:即使在形成辐射表面的对称辐射图案的天线被用于无线电认证系统中,也可以防止在楼上或楼下或墙壁的相对侧的应答者被错误地检测到 通过允许询问器通过使用无线电认证系统来检测房间中的进/出管理的无线电认证系统,产品的库存控制等,通过允许询问器发送问题信号,并且通过允许响应者 响应于问题信号返回响应信号。 解决方案:当检测区域35可以相对精确地设置为问题信号,并且响应者16A,16B使用LF频带来容易地接收问题信号时,与LF辐射表面对称的辐射图案被强制地从LF 天线34.因此,在询问器31中设置另一个LF天线41,用于对询问信号产生微弱的干扰波,从而错误地在较低的楼层上检测出安装楼层上的应答器16A,而不会在下层检测到应答器16B。 版权所有(C)2009,JPO&INPIT