公开(公告)号：US07372364B2

公开(公告)日：2008-05-13

申请号：US10705733

申请日：2003-11-10

申请人： Thomas C. Mercer ,  Ronald D. Jesme ,  Edward D. Goff

发明人： Thomas C. Mercer ,  Ronald D. Jesme ,  Edward D. Goff

IPC分类号： G08B13/00

CPC分类号： G06K7/0008 ,  G08B13/2457 ,  G08B13/2485

摘要： Techniques for detecting radio-frequency identification (RFID) tags are disclosed. For example, an exit control system is described that detects unauthorized removal of articles from a protected facility. A series of antennas are setup to produce interrogation corridors located near the exit of the protected area. RFID tags are attached to the articles to be protected. Each tag includes information that uniquely identifies the article to which it is affixed and status information as to whether the articles removal from the facility is authorized. The RF reader outputs RF signals through the antennas to create electromagnetic fields within the interrogation corridors. The reader outputs RF power from a single port to the multiple antennas via a splitter/combiner. In this way, a single RF reader with only one transmitter/receiver port simultaneously interrogates multiple antennas. A variety of techniques are described by which the reader can detect the removal of an unauthorized article.

摘要翻译： 公开了用于检测射频识别（RFID）标签的技术。 例如，描述了一种检测来自受保护设施的未经授权的物品移除的出口控制系统。 设置一系列天线以产生位于保护区出口附近的询问走廊。 RFID标签附着在要保护的物品上。 每个标签包括唯一标识其所附文章的信息以及关于从该设施移除的文章是否被授权的状态信息。 RF读取器通过天线输出RF信号，以在询问走廊内创建电磁场。 读取器通过分离器/组合器将单个端口的RF功率输出到多个天线。 以这种方式，只有一个发射机/接收机端口的单个RF读取器同时询问多个天线。 描述了各种技术，读者可以通过该技术检测未经授权的文章的移除。