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公开(公告)号：US09509061B2
公开(公告)日：2016-11-29
申请号：US14875001
申请日：2015-10-05
发明人： Michael J. Koch
CPC分类号： H01Q21/205 , G06K7/10326 , G06K7/10356 , H01Q1/2216 , H01Q1/50 , H01Q9/0407 , H01Q9/0428 , H01Q9/0435 , H01Q9/0442 , H01Q21/0006 , H01Q21/08
摘要： An RFID reader is provided that includes an antenna array comprising multiple antenna elements circumferentially distributed around a longitudinal axis of the antenna array. Each antenna element includes multiple patch elements disposed above one or more underlying substrates, wherein the patch elements of each antenna element are disposed on an outer side of the antenna element. Further, one or more of the antenna elements is an asymmetric antenna element, wherein a first end of the asymmetric antenna element is wider than a second, opposite end of the asymmetric antenna element, wherein a first patch element disposed proximate to the first end of the asymmetric antenna element is larger than a second patch element disposed proximate to the second end of the asymmetric antenna element, and wherein a resonant frequency associated with the first patch element is approximately the same as a resonant frequency associated with the second patch element.
摘要翻译： 提供RFID读取器，其包括天线阵列，天线阵列包括围绕天线阵列的纵向轴线周向分布的多个天线元件。 每个天线元件包括设置在一个或多个下面的衬底之上的多个贴片元件，其中每个天线元件的贴片元件设置在天线元件的外侧上。 此外，一个或多个天线元件是不对称天线元件，其中非对称天线元件的第一端比非对称天线元件的第二相对端宽，其中第一贴片元件设置在接近第一端 非对称天线元件大于靠近非对称天线元件的第二端设置的第二贴片元件，并且其中与第一贴片元件相关联的谐振频率与与第二贴片元件相关联的谐振频率大致相同。
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公开(公告)号：US20190034673A1
公开(公告)日：2019-01-31
申请号：US15661469
申请日：2017-07-27
发明人： Michael J. Koch , Guy P. Roberts , Joon Hwa Chun
IPC分类号： G06K7/10
摘要： A method of radio frequency identification (RFID) tag bearing estimation comprises: at an RFID tag reader having a plurality of antenna elements, emitting a primary transmit beam; receiving a response signal from an RFID tag via the antenna elements; generating a first set of signal measurements corresponding to a first set of receive beam characteristics, based on a first partition of the response signal; generating a second set of signal measurements corresponding to a second set of receive beam characteristics, based on a second partition of the response signal; and combining the first and second sets of signal measurements, for selection of an estimated tag bearing for the RFID tag from the first and second receive beam characteristics.
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公开(公告)号：US10817681B2
公开(公告)日：2020-10-27
申请号：US16404567
申请日：2019-05-06
发明人： Michael J. Koch
摘要： A method and apparatus are disclosed for improving RFID coverage using an antenna array having an adaptive antenna beam. The apparatus includes an RFID reader including an antenna array having a plurality of antenna elements. Subsets of the plurality of antenna elements are selectively activating in order to direct an antenna beam to communicate with at least one RFID tag. The method includes transmitting an interrogation signal from an antenna array by activating one or more subsets of a plurality of antenna elements forming the antenna array. In this way, the interrogation signal is directed thereby improving antenna coverage.
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公开(公告)号：US20190272397A1
公开(公告)日：2019-09-05
申请号：US16404567
申请日：2019-05-06
发明人： Michael J. Koch
摘要： A method and apparatus are disclosed for improving RFID coverage using an antenna array having an adaptive antenna beam. The apparatus includes an RFID reader including an antenna array having a plurality of antenna elements. Subsets of the plurality of antenna elements are selectively activating in order to direct an antenna beam to communicate with at least one RFID tag. The method includes transmitting an interrogation signal from an antenna array by activating one or more subsets of a plurality of antenna elements forming the antenna array. In this way, the interrogation signal is directed thereby improving antenna coverage.
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公开(公告)号：US10282575B2
公开(公告)日：2019-05-07
申请号：US15628211
申请日：2017-06-20
发明人： Michael J. Koch
摘要： A method and apparatus are disclosed for improving RFID coverage using an antenna array having an adaptive antenna beam. The apparatus includes an RFID reader including an antenna array having a plurality of antenna elements. Subsets of the plurality of antenna elements are selectively activating in order to direct an antenna beam to communicate with at least one RFID tag. The method includes transmitting an interrogation signal from an antenna array by activating one or more subsets of a plurality of antenna elements forming the antenna array. In this way, the interrogation signal is directed thereby improving antenna coverage.
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公开(公告)号：US20170293780A1
公开(公告)日：2017-10-12
申请号：US15628211
申请日：2017-06-20
发明人： Michael J. Koch
CPC分类号： G06K7/10356 , H01Q1/2216 , H01Q3/247 , H01Q3/26 , H04B7/04 , H04B7/0617 , H04B7/0691 , H04B7/0695 , H04B7/10
摘要： A method and apparatus are disclosed for improving RFID coverage using an antenna array having an adaptive antenna beam. The apparatus includes an RFID reader including an antenna array having a plurality of antenna elements. Subsets of the plurality of antenna elements are selectively activating in order to direct an antenna beam to communicate with at least one RFID tag. The method includes transmitting an interrogation signal from an antenna array by activating one or more subsets of a plurality of antenna elements forming the antenna array. In this way, the interrogation signal is directed thereby improving antenna coverage.
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公开(公告)号：US09773136B2
公开(公告)日：2017-09-26
申请号：US14886604
申请日：2015-10-19
IPC分类号： G06K7/10 , G01S13/75 , G06K19/077 , G06Q10/08 , G01S13/02
CPC分类号： G06K7/10366 , G01S13/751 , G01S2013/0245 , G06K7/10099 , G06K7/10356 , G06K19/07794 , G06Q10/087
摘要： A radio frequency identification (RFID) tag reading system and method accurately and rapidly determine, in real-time, true bearings of RFID tags associated with items in a controlled area. Primary transmit and receive beams are steered over the area, and multiple secondary receive beams are substantially simultaneously steered to a plurality of bearings in the area. The highest signal strength of secondary receive signals from the secondary receive beams determines an approximate tag bearing of each tag. Two secondary receive beams at opposite sides of the approximate tag bearing in elevation are selected to obtain a pair of elevation offset signals, and two secondary receive beams at opposite sides of the approximate tag bearing in azimuth are selected to obtain a pair of azimuth offset signals. The elevation offset signals and the azimuth offset signals are processed to determine a true bearing for each tag in real-time.
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公开(公告)号：US10726218B2
公开(公告)日：2020-07-28
申请号：US15661469
申请日：2017-07-27
发明人： Michael J. Koch , Guy P. Roberts , Joon Hwa Chun
IPC分类号： G06K7/10
摘要： A method of radio frequency identification (RFID) tag bearing estimation comprises: at an RFID tag reader having a plurality of antenna elements, emitting a primary transmit beam; receiving a response signal from an RFID tag via the antenna elements; generating a first set of signal measurements corresponding to a first set of receive beam characteristics, based on a first partition of the response signal; generating a second set of signal measurements corresponding to a second set of receive beam characteristics, based on a second partition of the response signal; and combining the first and second sets of signal measurements, for selection of an estimated tag bearing for the RFID tag from the first and second receive beam characteristics.
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公开(公告)号：US20170177912A1
公开(公告)日：2017-06-22
申请号：US14975931
申请日：2015-12-21
IPC分类号： G06K7/10
CPC分类号： G06K7/10425 , G06K7/10029 , G06K7/10118 , G06Q10/087
摘要： A radio frequency identification (RFID) tag reading system and method read RFID tags in a controlled area in real time with an enhanced performance. An RFID reader reads a mixed tag population of interesting RFID tags and of uninteresting RFID tags in the controlled area at a read rate. A controller dynamically and continuously monitors the read rate in real time, dynamically selects the interesting RFID tags, or deselects the uninteresting RFID tags, in real time when the read rate is below a reading threshold, and dynamically controls the RFID reader in real time to only read the interesting RFID tags when the read rate is below the reading threshold.
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