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    • 2. 发明申请
    • DISCONTINUOUS-LOOP RFID READER ANTENNA AND METHODS
    • 不连续读取RFID阅读器天线和方法
    • WO2007084510A1
    • 2007-07-26
    • PCT/US2007/001149
    • 2007-01-17
    • IMPINJ, INC.OLIVER, Ronald, A.KAVOUNAS, Gregory, A.
    • OLIVER, Ronald, A.KAVOUNAS, Gregory, A.
    • H01Q1/22H01Q7/00
    • H01Q1/22H01Q7/00
    • RFID reader antennas and methods for generating magnetic fields. An antenna can be made from conductors that do not contact each other, but have loop portions spatially arranged along a loop section. The loop portions have gaps between them, and thus the loop section is discontinuous. The loop section can be driven from near its ends by a UHF RFID excitation signal, which travels through the loop portions, and also through the gaps because it is AC. Thus an excitation current becomes established along the loop section, which generates a useable magnetic field. Each loop portion can be short, so that the magnetic field it contributes will not self-cancel due to the shorter wavelength of UHF RFID. The loop section can be large independently of the wavelength, so that the magnetic field is of a size large enough to be useful for ILT in RFID.
    • RFID阅读器天线和产生磁场的方法。 天线可以由不彼此接触的导体制成,但是具有沿着环路部分空间布置的环路部分。 环路部分之间具有间隙,因此环路部分是不连续的。 环路部分可以通过UHF RFID激励信号从其端部附近驱动,UHF RFID激励信号通过环路部分,以及由于它是AC而通过间隙。 因此,沿着环路部分建立激励电流,产生可用的磁场。 每个环路部分可能很短,因此由于UHF RFID的较短波长,它所贡献的磁场将不会自动消除。 环路部分可以独立于波长而大,使得磁场的尺寸足够大,可用于RFID中的ILT。