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    • 3. 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。
    • 5. 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。
    • 6. 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。
    • 9. 发明授权
    • Linear frequency sweep synthesizer
    • 线性频率扫描合成器
    • US5210539A
    • 1993-05-11
    • US913777
    • 1986-09-30
    • Kenneth G. Voyce
    • Kenneth G. Voyce
    • G01S7/40G01S13/34
    • G01S13/343G01S7/4004
    • A circuit for generating an output signal having an output frequency that varies linearly with time, and to an FM CW radar system utilizing such a circuit. The circuit includes a voltage controlled oscillator that produces an output signal at its output terminal at an output frequency that corresponds to the voltage of an input tuning signal. A comparison signal circuit receives the output signal and produces a periodic comparison signal such that when the output frequency varies by .DELTA.f, the comparison signal frequency varies by .DELTA.f/N where N is a positive integer. An update counter periodically causes the value of N to change by a predetermined integer amount. A phase detector compares the comparison signal to a periodic reference signal, and produces a correction signal that is filtered to provide the tuning signal for the VCO. The value of N is preferably changed at an update frequency that is equal to the frequency of the reference signal times an integer. The comparison signal circuit preferably includes a local oscillator for converting the output signal into a periodic IF signal for input to a divider. A high side local oscillator is preferred to minimize loop gain variation with frequency.
    • 一种用于产生具有随时间线性变化的输出频率的输出信号的电路以及利用这种电路的FM CW雷达系统。 该电路包括压控振荡器,其在其输出端产生输出信号,输出频率对应于输入调谐信号的电压。 比较信号电路接收输出信号并产生周期性比较信号,使得当输出频率变化DELTA f时,比较信号频率随DELTA f / N变化,其中N是正整数。 更新计数器周期性地使N的值改变预定的整数。 相位检测器将比较信号与周期性参考信号进行比较,并产生经滤波以提供VCO的调谐信号的校正信号。 N的值优选地以等于参考信号的频率乘以整数的更新频率来改变。 比较信号电路优选地包括用于将输出信号转换为周期性IF信号以便输入到分频器的本地振荡器。 优选的是高端本地振荡器以最小化频率上的环路增益变化。