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    • 1. 发明授权
    • Inductively coupled feed structure and matching circuit for RFID device
    • 用于RFID设备的电感耦合馈电结构和匹配电路
    • US07557757B2
    • 2009-07-07
    • US11610288
    • 2006-12-13
    • Daniel D. DeavoursMadhuri Bharadwaj Eunni
    • Daniel D. DeavoursMadhuri Bharadwaj Eunni
    • H01Q1/38
    • G06K19/07749G06K19/07786H01Q1/22H01Q1/2208H01Q1/2216H01Q1/2225H01Q1/38H01Q1/48H01Q5/35H01Q5/40H01Q9/0407H01Q9/0442H01Q9/28H01Q9/30H01Q9/40H01Q23/00
    • A feed structure (18) and matching circuit (20) for inductively coupling an antenna (16) with an IC (22) in an RFID tag (10). The tag (10) includes first and second feed structures (26,28) coupled with the antenna (16), a first transmission line (30) coupling the feed structures (26,28), and a matching circuit (20) including a second transmission line (32) having a portion that is substantially parallel to and spaced apart from the first transmission line (30) such that the first and second transmission lines (30,32) inductively couple. Where two or more antenna elements (56,57) are used, the elements (56,57) are sufficiently loosely coupled by inductive coupling that they can operate at nearly the same frequency without forming a single resonant antenna. Thus, for example, different elements can operate at approximately 905 MHz and approximately 925 MHz, respectively, to effectively cover the FCC range of 900-930 MHz.
    • 一种用于将天线(16)与RFID标签(10)中的IC(22)感应耦合的馈电结构(18)和匹配电路(20)。 标签(10)包括与天线(16)耦合的第一和第二馈送结构(26,28),耦合馈电结构(26,28)的第一传输线(30)和包括 第二传输线(32)具有基本上与第一传输线(30)平行并间隔开的部分,使得第一和第二传输线(30,32)感应耦合。 在使用两个或多个天线元件(56,57)的情况下,元件(56,57)通过电感耦合足够松散地耦合,使得它们可以以几乎相同的频率工作而不形成单个谐振天线。 因此,例如,不同的元件可以分别在大约905MHz和大约925MHz下工作,以有效地覆盖900-930MHz的FCC范围。