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    • 1. 发明授权
    • Portable radio frequency identification (RFID) reader
    • 便携式射频识别(RFID)阅读器
    • US08461965B2
    • 2013-06-11
    • US12686922
    • 2010-01-13
    • Ming ChenFong ShiKenneth G. Voyce
    • Ming ChenFong ShiKenneth G. Voyce
    • H04Q5/22
    • G01S13/4445G01S3/043G01S13/4454G01S13/75
    • A particular portable radio frequency identification (RFID) reader includes an active antenna array including a plurality of antenna elements to receive RFID signals from RFID devices. The antenna elements include control circuitry to control a beam pattern generated by the active antenna array. The portable RFID reader further includes sum circuitry and difference circuitry. The sum circuitry is operable to determine a sum signal by summing the RFID signals received by at least two of the plurality of antenna elements. The difference circuitry is operable to determine a difference signal between the RFID signals received by at least two of the plurality of antenna elements. The portable RFID reader also includes a controller to electronically steer the beam pattern and to determine a direction from the RFID reader to a particular RFID device.
    • 特定便携式射频识别(RFID)读取器包括有源天线阵列,其包括用于从RFID设备接收RFID信号的多个天线元件。 天线元件包括用于控制由有源天线阵列产生的波束图案的控制电路。 便携式RFID读取器还包括和电路和差分电路。 总和电路可操作以通过将由多个天线元件中的至少两个接收的RFID信号相加来确定和信号。 差分电路可操作以确定由多个天线元件中的至少两个天线元件接收的RFID信号之间的差分信号。 便携式RFID读取器还包括控制器,用于电子地操纵光束图案并确定从RFID读取器到特定RFID设备的方向。
    • 2. 发明申请
    • PORTABLE RADIO FREQUENCY IDENTIFICATION (RFID) READER
    • 便携式无线电频率识别(RFID)读取器
    • US20110169613A1
    • 2011-07-14
    • US12686922
    • 2010-01-13
    • Ming ChenFong ShiKenneth G. Voyce
    • Ming ChenFong ShiKenneth G. Voyce
    • H04Q5/22
    • G01S13/4445G01S3/043G01S13/4454G01S13/75
    • A particular portable radio frequency identification (RFID) reader includes an active antenna array including a plurality of antenna elements to receive RFID signals from RFID devices. The antenna elements include control circuitry to control a beam pattern generated by the active antenna array. The portable RFID reader further includes sum circuitry and difference circuitry. The sum circuitry is operable to determine a sum signal by summing the RFID signals received by at least two of the plurality of antenna elements. The difference circuitry is operable to determine a difference signal between the RFID signals received by at least two of the plurality of antenna elements. The portable RFID reader also includes a controller to electronically steer the beam pattern and to determine a direction from the RFID reader to a particular RFID device.
    • 特定便携式射频识别(RFID)读取器包括有源天线阵列,其包括用于从RFID设备接收RFID信号的多个天线元件。 天线元件包括用于控制由有源天线阵列产生的波束图案的控制电路。 便携式RFID读取器还包括和电路和差分电路。 总和电路可操作以通过将由多个天线元件中的至少两个接收的RFID信号相加来确定和信号。 差分电路可操作以确定由多个天线元件中的至少两个天线元件接收的RFID信号之间的差分信号。 便携式RFID读取器还包括控制器,用于电子地操纵光束图案并确定从RFID读取器到特定RFID设备的方向。
    • 10. 发明授权
    • Minimum intrusion search oscillator for use in feedback loops
    • 用于反馈回路的最小入侵搜索振荡器
    • US5049838A
    • 1991-09-17
    • US409458
    • 1989-09-19
    • Kenneth G. Voyce
    • Kenneth G. Voyce
    • H03L7/12
    • H03L7/12Y10S331/02
    • A search oscillator (12) is disclosed for use with a closed-loop system (10) to sense when the system is out of lock and enhance the system's pull-in capabilities. The oscillator includes a loop filter (22) and a sensing circuit (24), composed of a positive limit sensor (26) and negative limit sensor (28). When the system is out of lock, the output V.sub.out of the oscillator slews positive or negative in an effort to restore the system to lock. The positive and negative limit sensors monitor the output and reset it when predetermined thresholds are reached, allowing the search or sweep operation to continue until lock is achieved.
    • 搜索振荡器(12)被公开用于与闭环系统(10)一起使用以感测系统何时失锁并且增强系统的拉入能力。 该振荡器包括由正极传感器(26)和负极限传感器(28)组成的环路滤波器(22)和感测电路(24)。 当系统失锁时,振荡器的输出Vout为正或负,以恢复系统锁定。 正极和负极限传感器监测输出并在达到预定阈值时将其复位,允许搜索或扫描操作继续,直到达到锁定。