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    • 7. 发明授权
    • Anticollision protocol with fast read request and additional schemes for reading multiple transponders in an RFID system
    • 具有快速读取请求的抗冲突协议和用于读取RFID系统中的多个应答器的附加方案
    • US06963270B1
    • 2005-11-08
    • US09428033
    • 1999-10-27
    • William F. Gallagher, IIIRonald SaleskyShinichiro InuiRiccardo BenedettiSamuel AlexanderLee R. FureyYoubok Lee
    • William F. Gallagher, IIIRonald SaleskyShinichiro InuiRiccardo BenedettiSamuel AlexanderLee R. FureyYoubok Lee
    • G06K7/00H04Q7/00H04Q5/22
    • G06K7/10039G06K7/0008
    • Arbitration of multiple transponders, such as RFID tags, occurs in an interrogation field. The arbitration process is custom-tailored for individual applications, under software control, by the transponder reader or tag reader. Different wake-up slots are calculated for each tag during successive transmission cycles based upon the tag ID and the transmission cycle number. The tag reader may send a special fast read command to the tag which includes a read request and communications control parameters including the number of time slots for transponder communications, the number of transmissions that an individual transponder is allowed to issue, and the data rate at which the reader communicates to the transponder. The tag reader may also send a special command to a tag to read its data and cause the tag to become decoupled from the environment. Additional schemes are provided to halve the number of active tags in each transmission cycle and to selectively inactivate designated groupings of tag, thereby improving discrimination of the tags in the interrogation field. The tags may be selectively placed in either a tag-talk-first mode or a reader-talk-first mode.
    • 多个转发器(如RFID标签)的仲裁发生在询问领域。 仲裁过程是由应答程序读取器或标签读取器在软件控制下针对各个应用程序进行定制的。 基于标签ID和传输周期数,在连续传输周期期间针对每个标签计算不同的唤醒时隙。 标签读取器可以向标签发送特殊的快速读取命令,该标签包括读请求和通信控制参数,该参数包括用于应答器通信的时隙数,允许单个应答器发送的传输次数,以及数据速率在 读者与应答器通信。 标签读取器还可以向标签发送特殊命令以读取其数据并使标签与环境分离。 提供了另外的方案来在每个传输周期中将活动标签的数量减半,并且选择性地停用指定的标签分组,从而改善询问字段中的标签的区分。 标签可以选择性地放置在标签通话第一模式或读取器通话第一模式中。
    • 8. 发明授权
    • RFID tag having parallel resonant circuit for magnetically decoupling
tag from its environment
    • RFID标签具有并联谐振电路,用于将标签与其环境磁性去耦
    • US6072383A
    • 2000-06-06
    • US185775
    • 1998-11-04
    • William F. Gallagher, IIIShinichiro Inui
    • William F. Gallagher, IIIShinichiro Inui
    • G06K7/08G06K17/00G06K19/07G08B13/22H04B1/59H04B5/02H04Q1/00
    • G06K7/10336G06K19/0723
    • An RFID tag circuit provides magnetic decoupling and amplitude modulation. The circuit is made up of a first inductor and a second inductor connected in series, a first capacitor, a second capacitor, and a switch. The circuit includes a first resonant circuit formed from a parallel connection of the series connected first and second inductors, and the first capacitor. The first resonant circuit has a primary resonant frequency. The circuit also includes a second circuit formed from a series connection of the second capacitor and the switch. The series connection of the second capacitor and the switch are connected in parallel to the second inductor. One end of the series connected second capacitor and switch is connected to the common connection between the series connected first and second inductors. When the switch is open, the second circuit has a minimal or no effect on the tag and the first resonant circuit resonates at the primary resonant frequency when the tag is exposed to an external field at or near the primary resonant frequency. When the switch is closed, the second circuit defines a high impedance parallel resonant circuit which functions to block or minimize current flow at the primary resonant frequency, thereby preventing the tag from drawing any significant amount of power from the external field and from resonating at the primary resonant frequency. The tag is thereby decoupled from its environment.
    • RFID标签电路提供磁解耦和幅度调制。 电路由串联连接的第一电感器和第二电感器,第一电容器,第二电容器和开关构成。 电路包括由串联连接的第一和第二电感器和第一电容器的并联连接形成的第一谐振电路。 第一谐振电路具有初级谐振频率。 电路还包括由第二电容器和开关的串联连接形成的第二电路。 第二电容器和开关的串联连接并联连接到第二电感器。 串联连接的第二电容器和开关的一端连接到串联的第一和第二电感器之间的公共连接。 当开关断开时,当标签暴露于初级谐振频率处或接近初级谐振频率处的外部场时,第二电路对标签具有最小或没有影响,并且第一谐振电路以初级谐振频率谐振。 当开关闭合时,第二电路限定了一个高阻抗并联谐振电路,其功能是阻止或最小化初级谐振频率处的电流,从而防止标签从外部场中抽出任何大量的功率,并在 初级谐振频率。 标签因此与其环境脱钩。