Method to increase RFID tag sensitivity

• Main Authors: MARTINEZ RENE, NIKITIN PAVEL, KELLY STEPHEN J
• Format: Patent
• Language: Chinese; English
• Published: 25.12.2018
• Subjects: CALCULATING; COMPUTING; COUNTING; HANDLING RECORD CARRIERS; PHYSICS; PRESENTATION OF DATA; RECOGNITION OF DATA; RECORD CARRIERS

The invention relates to a method to increase RFID tag sensitivity. A radio-frequency identification (RFID) tag with improved sensitivity includes an antenna that receives a radio-frequency (RF) signal and wireless power from an RFID reader. The RFID tag further includes a circuit that varies a reflection coefficient of the antenna to transmit a reflected signal to the reader, the reflected signalhaving periods of high reflectance when a relatively high amount of the RF signal is reflected, and low reflectance periods when a relatively low amount of the RF signal is reflected. The reflectanceof the antenna is sufficiently low during the high reflectance periods to enable wireless power reception during the high reflectance periods. 本发明涉及增加RFID标签灵敏度的方法。种具有改善的灵敏度的射频识别（RFID）标签，其包括：天线，其接收来自RFID读取器的射频（RF）信号和无线功率。RFID标签进步包括：电路，其改变天线的反射系数来向读取器传输被反射的信号，该被反射的信号具有当反射RF信号的相对高的量时的高反射比时段以及当反射RF信号的相对低的量时的低反射比时段。天线的反射比在高反射比时段期间是足够低的，以使得能够在高反射比时段期间进行无线功率接收。