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    • 2. 发明授权
    • Tunable RFID tag for global applications
    • 可调整的RFID标签用于全球应用
    • US07323977B2
    • 2008-01-29
    • US11081239
    • 2005-03-15
    • Venkata S. KodukulaPavel NikitinFor Sander Lam
    • Venkata S. KodukulaPavel NikitinFor Sander Lam
    • G08B26/00G08B13/14H01Q21/12
    • G06K19/07786G06K19/0724G06K19/0726G06K19/07749
    • An RF transponder comprises a transponder integrated circuit, an antenna connected to the transponder integrated circuit, and at least one parasitic element adapted to interact electrically with the antenna and thereby affect antenna impedance. The orientation of the parasitic element with respect to the antenna is selected to achieve a desired operational frequency band for the RF transponder. Specifically, the spacing between the antenna and the parasitic element is selected to achieve the desired operational frequency band. For example, a first selected spacing may enable an operational frequency band suitable for a first geographic region (e.g., the United States), a second selected spacing may enable an operational frequency band suitable for a second geographic region (e.g., Europe), and a third selected spacing may enable an operational frequency band suitable for a third geographic region (e.g., Japan).
    • RF应答器包括应答器集成电路,连接到应答器集成电路的天线以及适于与天线电气相互作用从而影响天线阻抗的至少一个寄生元件。 选择寄生元件相对于天线的取向以实现RF转发器的期望的工作频带。 具体地说,选择天线和寄生元件之间的间隔以实现期望的工作频带。 例如,第一选择的间隔可以使得适合于第一地理区域(例如,美国)的操作频带,第二选定的间隔可以使得适合于第二地理区域(例如,欧洲)的操作频带,以及 第三选择的间隔可以使得适合于第三地理区域(例如,日本)的操作频带。
    • 3. 发明授权
    • Method and apparatus to estimate the number of transponders in a field
    • 估计一个领域的转发器数量的方法和装置
    • US08564412B2
    • 2013-10-22
    • US12958991
    • 2010-12-02
    • Pavel NikitinVenkata S. Kodukula
    • Pavel NikitinVenkata S. Kodukula
    • H04Q5/22
    • G06K7/10118G06K7/10039
    • A total number of transponders in an interrogation field is estimated or determined based on demodulated baseband direct and quadrature components from a plurality of collided responses from multiple transponders, including collided responses from which information encoded therein cannot be recovered, and would conventionally be discarded. A query or Q value may be set without an a priori knowledge of the actual number or even approximate number of transponders in the field of the interrogator or reader. Such may allow transponders to be quickly and efficiently singulated, for example in a single pass, and information read from and/or written to singulated transponders.
    • 基于来自多个转发器的多个冲突响应的解调基带直接和正交分量来估计或确定询问字段中的总数,包括不能恢复其中编码的信息的冲突响应,并且通常将被丢弃。 可以设置查询或Q值,而不需要在询问器或读取器的领域中的实际数量或甚至近似数量的应答器的先验知识。 这样可以允许转发器被快速有效地分割,例如在单次传递中,以及从和/或写入单个转发器的信息。