公开(公告)号：US07671720B1

公开(公告)日：2010-03-02

申请号：US10932684

申请日：2004-09-01

申请人： Robert Martin ,  Donald Speirs ,  Gregory P. Katterhagen

发明人： Robert Martin ,  Donald Speirs ,  Gregory P. Katterhagen

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。

公开(公告)号：US20050156039A1

公开(公告)日：2005-07-21

申请号：US10993668

申请日：2004-11-19

申请人： Curtis Carrender ,  Donald Speirs

发明人： Curtis Carrender ,  Donald Speirs

IPC分类号： G06K7/00

CPC分类号： G06K7/0008

摘要： Radio Frequency Identification (RFID) readers with a directional coupler. At least one embodiment of the present invention provides an RFID reader designed to use a directional coupler to receive signals from an antenna which is connected to a radio frequency source of the reader to transmit signals. The directional coupler samples the signals received at the antenna and provides the received signal to a receiver of the RFID reader. In one example, the receiver of the RFID reader compares a portion of the signals from the radio frequency source with the received signal from the directional coupler to receive data from RF tags.

摘要翻译： 具有定向耦合器的射频识别（RFID）读取器。 本发明的至少一个实施例提供一种被设计成使用定向耦合器来从连接到读取器的射频源的天线接收信号以发射信号的RFID读取器。 定向耦合器对在天线处接收的信号进行采样，并将接收的信号提供给RFID读取器的接收器。 在一个示例中，RFID读取器的接收器将来自射频源的信号的一部分与来自定向耦合器的接收信号进行比较，以从RF标签接收数据。