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公开(公告)号：US07068224B2
公开(公告)日：2006-06-27
申请号：US10800164
申请日：2004-03-12
IPC分类号： H01Q1/38
CPC分类号： H01Q1/22 , H01Q1/2216 , H01Q9/045 , H01Q9/0457
摘要： According to an embodiment of the invention, a patch antenna includes a patch coupled to a ground plane. The ground plane includes a first and second strip line. When the first strip line is activated, the antenna generates a signal having a first polarization, and when the second strip line is activated, the antenna generates a second polarization. The first polarization may be a horizontal polarization, and the second polarization may be a vertical polarization. The antenna may be incorporated into a radio frequency identification (RFID) interrogator, which may be used to read RFID tags attached to individual items.
摘要翻译： 根据本发明的实施例，贴片天线包括耦合到接地平面的贴片。 接地平面包括第一和第二带状线。 当第一带状线被激活时，天线产生具有第一极化的信号，并且当第二带状线被激活时，天线产生第二极化。 第一偏振可以是水平偏振，并且第二偏振可以是垂直偏振。 该天线可以被结合到射频识别（RFID）询问器中，该询问器可用于读取附着到各个物品的RFID标签。
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公开(公告)号：US07671720B1
公开(公告)日：2010-03-02
申请号：US10932684
申请日：2004-09-01
IPC分类号： H04Q9/00
CPC分类号： G06K19/0723 , H04B1/525
摘要： According to several embodiments of the invention, a radio frequency identification (RFID) interrogator utilizing a circuit to remove unwanted distortion from a received signal is described. The interrogator transmits a transmitted signal continuously, while receiving a received signal from a radio frequency identification (RFID) tags. The circuit samples the transmitted signal, and removes the unwanted distortion created by the transmitted signal from the received signal.
摘要翻译： 根据本发明的几个实施例，描述了利用电路从接收信号去除不想要的失真的射频识别（RFID）询问器。 询问器在从射频识别（RFID）标签接收接收到的信号的同时，连续地发送发送的信号。 电路对发射信号进行采样，并从接收到的信号中消除由发射信号产生的不必要的失真。
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