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    Method of communication in a radio frequency identification system
    1.
    发明授权
    Method of communication in a radio frequency identification system 失效
    射频识别系统中的通信方法

    公开(公告)号：US06763996B2

    公开(公告)日：2004-07-20

    申请号：US09955345

    申请日：2001-09-18

    申请人： Patrick L. Rakers ,  Timothy James Collins ,  Richard Stanley Rachwalski ,  Michael L. Bushman

    发明人： Patrick L. Rakers ,  Timothy James Collins ,  Richard Stanley Rachwalski ,  Michael L. Bushman

    IPC分类号： G06F1700

    CPC分类号： G06K19/0723 ,  G06K7/0008

    摘要： In accordance with the present invention, a radio frequency identification (RFID) device comprises a plurality of data fields. The RFID device transmits a data symbol from a data field, receives an acknowledgement symbol, and compares the transmitted data symbol to the received acknowledgement symbol. The RFID device repeats these steps until data transmission is complete as long as each transmitted data symbol is equivalent to a corresponding received acknowledgement symbol; otherwise, the RFID device maintains the data field from which the last data symbol was transmitted, and temporarily suspends data transmission. When the RFID receives a request for RFID devices temporarily suspended in a given data field to resume data transmission, if the given data field in the request is equivalent to the data field that was maintained, the RFID device repeats the steps above starting with the first symbol in the data field that was maintained.

    摘要翻译： 根据本发明，射频识别（RFID）设备包括多个数据字段。 RFID设备从数据字段发送数据符号，接收确认符号，并将发送的数据符号与接收到的确认符号进行比较。 RFID设备重复这些步骤直到数据传输完成，只要每个发送的数据符号等同于相应的接收的确认符号; 否则，RFID设备维护发送最后一个数据符号的数据字段，并暂时暂停数据传输。 当RFID接收到暂时停留在给定数据字段中的RFID设备的请求以恢复数据传输时，如果请求中的给定数据字段等同于维护的数据字段，则RFID设备重复上述步骤，从第一 在维护的数据字段中的符号。

    Method and apparatus for selectively activating radio frequency identification tags that are in close proximity
    3.
    发明授权
    Method and apparatus for selectively activating radio frequency identification tags that are in close proximity 有权
    用于选择性地激活非常接近的射频识别标签的方法和装置

    公开(公告)号：US06392544B1

    公开(公告)日：2002-05-21

    申请号：US09669289

    申请日：2000-09-25

    申请人： Timothy James Collins ,  Patrick L. Rakers ,  Richard Stanley Rachwalski ,  James G. Quaderer

    发明人： Timothy James Collins ,  Patrick L. Rakers ,  Richard Stanley Rachwalski ,  James G. Quaderer

    IPC分类号： G08B1314

    CPC分类号： G06K7/10346 ,  G06K7/0008 ,  G06K7/10019 ,  G06K7/10316

    摘要： A radio frequency identification exciter (200) includes a plurality of antenna elements (122a-i) that are spaced to define active areas (130a-e). A matrix switch (202) flexibly connects the plurality of antenna elements to an exciter circuit (203). Independent switches (204a-i) are selectively switched such that an electric field is generated between at least two antenna elements whereby radio frequency identification tags (132) in the vicinity of the two antenna elements are capacitively powered to exchange data with the exciter. Antenna elements other than the at least two antenna elements may be selectively coupled to a signal from the exciter circuit that inhibits activation of radio frequency identification tags in the vicinity of those antenna elements. The matrix switch preferably comprises polymer-based circuits.

    摘要翻译： 射频识别激励器（200）包括间隔开以限定有源区域（130a-e）的多个天线元件（122a-i）。 矩阵开关（202）将多个天线元件灵活地连接到激励器电路（203）。 选择性地切换独立开关（204a-i），使得在至少两个天线元件之间产生电场，由此在两个天线元件附近的射频识别标签（132）被电容地供电以与激励器交换数据。 除了至少两个天线元件之外的天线元件可以选择性地耦合到来自激励器电路的信号，该信号禁止在那些天线元件附近激活射频识别标签。 矩阵开关优选地包括基于聚合物的电路。

    Data transmission terminal and contactless data/power delivery method for use therewith
    5.
    发明授权
    Data transmission terminal and contactless data/power delivery method for use therewith 失效
    数据传输终端和非接触式数据/电力传输方法

    公开(公告)号：US06222880B1

    公开(公告)日：2001-04-24

    申请号：US08940537

    申请日：1997-09-30

    申请人： Bruce Charles Eastmond ,  Richard Stanley Rachwalski ,  Rachid Alameh

    发明人： Bruce Charles Eastmond ,  Richard Stanley Rachwalski ,  Rachid Alameh

    IPC分类号： H03K704

    CPC分类号： G06K19/0701 ,  G06K7/0008 ,  H03K7/04

    摘要： A data transmission system (200) includes a data transmission terminal (201) and a portable data device (203) that is remotely powered by the terminal. A method is provided for supplying power and data from the terminal (201) to the portable data device (203) using a carrier signal (401), including the step of identifying a slot location into which a modulation discontinuity (403-409) is introduced. The slot location is chosen within a modulation frame, which is based on n bits of the information signal to be transmitted, the number of slots in the frame varying between 1 and 2n. The modulation discontinuity (403-409) is introduced into the chosen slot location to produce an encoded data stream, which is then transmitted to the portable data device.

    摘要翻译： 数据传输系统（200）包括数据传输终端（201）和由终端远程供电的便携式数据设备（203）。 提供了一种使用载波信号（401）从终端（201）向便携式数据设备（203）提供电力和数据的方法，包括以下步骤：识别调制不连续性（403-409）所在的时隙位置 介绍。 在基于要发送的信息信号的n个比特的调制帧内选择时隙位置，帧中的时隙数在1和2n之间变化。 将调制不连续性（403-409）引入所选择的时隙位置以产生编码数据流，然后将其传输到便携式数据设备。