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1.发明授权公开(公告)号：US07421245B2
公开(公告)日：2008-09-02
申请号：US10784109
申请日：2004-02-20
Applicant: Seth A. Lieffort , Edward D. Goff
Inventor： Seth A. Lieffort , Edward D. Goff
IPC: H04B5/00
CPC classification number: H01Q1/2208 , G06K7/10178 , G06K7/10336 , G06K7/10346 , H01Q1/22 , H01Q1/526 , H01Q7/00
Abstract: A radio frequency identification (RFID) system is described that utilizes a substantially-contiguous conductive shield to shape an electromagnetic field formed by an antenna for communication with RFID tags. The antenna and the conductive shield have substantially planar forms, and may be mounted to a surface of a check-in/check-out area. The conductive shield is positioned around the antenna and within a plane parallel to the antenna, e.g., within the same plane. The conductive shield shapes the electromagnetic field to extend substantially in a direction perpendicular to the antenna, and prevents the electromagnetic field from forming substantially over the conductive shield.
Abstract translation: 描述了射频识别（RFID）系统，其利用基本相邻的导电屏蔽来形成由天线形成的电磁场，以与RFID标签通信。 天线和导电屏蔽具有基本上平面的形式，并且可以安装到登记/退房区域的表面。 导电屏蔽围绕天线定位在与天线平行的平面内，例如位于同一平面内。 导电屏蔽使电磁场形成大致垂直于天线的方向延伸，并防止电磁场基本上形成在导电屏蔽层上。
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公开(公告)号：US07119692B2
公开(公告)日：2006-10-10
申请号：US10705677
申请日：2003-11-10
Applicant: Seth A. Lieffort , Edward D. Goff , Ronald D. Jesme , Thomas C. Mercer
Inventor： Seth A. Lieffort , Edward D. Goff , Ronald D. Jesme , Thomas C. Mercer
IPC: G08B13/14
CPC classification number: G06K17/00 , G06K7/10039 , G06K2017/0045 , G08B13/2462 , G08B13/2474 , G08B13/248 , G08B13/2485 , G08B13/2488
Abstract: 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.
Abstract translation: 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。
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3.发明授权
公开(公告)号：US07417599B2
公开(公告)日：2008-08-26
申请号：US10784124
申请日：2004-02-20
Applicant: Edward D. Goff , Seth A. Lieffort , Leroy Stolberg
Inventor： Edward D. Goff , Seth A. Lieffort , Leroy Stolberg
IPC: H01Q21/00
CPC classification number: H01Q1/22 , B82Y20/00 , G02B6/1225 , G06K7/10178 , G06K7/10336 , G06K7/10346 , H01Q1/2216 , H01Q1/38 , H01Q7/00 , H01Q21/29
Abstract: A multi-loop antenna is described having a plurality of conductive loops to produce an electromagnetic field for radio frequency identification (RFID) communication with RFID tags. The conductive loops are spaced apart at least a distance that is selected based on a dimension of the RFID tags with which the antenna communicates. In this manner, the loops are positioned and spaced in a manner that reduces the size of the holes within the resulting magnetic field. In addition, the configuration of the described dual-loop antenna increases the coverage of the antenna, and decreases inter-winding capacitance, thereby increasing overall read range achieved by the antenna.
Abstract translation: 描述了具有多个导电回路以产生用于与RFID标签的射频识别（RFID）通信的电磁场的多回路天线。 导电环路间隔开至少一个基于天线通信的RFID标签的尺寸来选择的距离。 以这种方式，以减小所得磁场内的孔的尺寸的方式定位和间隔环。 此外，所描述的双环天线的配置增加了天线的覆盖范围，并且减小了绕组间电容，从而增加了由天线实现的总体读取范围。
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公开(公告)号：US07405663B2
公开(公告)日：2008-07-29
申请号：US11539716
申请日：2006-10-09
Applicant: Seth A. Lieffort , Edward D. Goff , Ronald D. Jesme , Thomas C. Mercer
Inventor： Seth A. Lieffort , Edward D. Goff , Ronald D. Jesme , Thomas C. Mercer
CPC classification number: G06K17/00 , G06K7/10039 , G06K2017/0045 , G08B13/2462 , G08B13/2474 , G08B13/248 , G08B13/2485 , G08B13/2488
Abstract: 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.
Abstract translation: 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。
