本文基于无线充电,通过基于有限元法的电磁仿真软件(HFSS)对线圈天线进行3D建模。在二端口网络分析法的基础上,建立谐振式无线充电的等效电路模型,求解出系统最大传输效率时的表达式。基于以上方法,研究本文设计的线圈天线传输特性,包...本文基于无线充电,通过基于有限元法的电磁仿真软件(HFSS)对线圈天线进行3D建模。在二端口网络分析法的基础上,建立谐振式无线充电的等效电路模型,求解出系统最大传输效率时的表达式。基于以上方法,研究本文设计的线圈天线传输特性,包括线圈天线的S参数、驻波比、充电效率和3D电磁场分布图,得出线圈天线在中心频率2.8 GHz处发生谐振,输入回波损耗最小,为–29.11 d B,且充电效率可达到84.15%。此外,线圈天线具有成本低、结构简单等优势,因此该设计对无线充电的研究有很好的借鉴作用。展开更多
A new,low-cost RFID tag analog front-end compatible with ISO 14443A and ISO 14443B is presented. By substituting conventional multi-circle antenna with single-circle antenna, the package cost of the tag is greatly red...A new,low-cost RFID tag analog front-end compatible with ISO 14443A and ISO 14443B is presented. By substituting conventional multi-circle antenna with single-circle antenna, the package cost of the tag is greatly reduced. Based on this exasperate antenna performance,a new rectifier with high power conversion efficiency and low turn-on voltage is presented. The circuit is implemented in an SMIC 0.18μm EEPROM process. Measurement results show that with a 120kΩ load,the power conversion efficiency reaches as high as 36%. For a sinusoidal wave with magnitude of 0. 5V, the output DC voltage reaches IV,which is high enough for RFID tags. The read distance is as far as 22cm.展开更多
文摘本文基于无线充电,通过基于有限元法的电磁仿真软件(HFSS)对线圈天线进行3D建模。在二端口网络分析法的基础上,建立谐振式无线充电的等效电路模型,求解出系统最大传输效率时的表达式。基于以上方法,研究本文设计的线圈天线传输特性,包括线圈天线的S参数、驻波比、充电效率和3D电磁场分布图,得出线圈天线在中心频率2.8 GHz处发生谐振,输入回波损耗最小,为–29.11 d B,且充电效率可达到84.15%。此外,线圈天线具有成本低、结构简单等优势,因此该设计对无线充电的研究有很好的借鉴作用。
文摘A new,low-cost RFID tag analog front-end compatible with ISO 14443A and ISO 14443B is presented. By substituting conventional multi-circle antenna with single-circle antenna, the package cost of the tag is greatly reduced. Based on this exasperate antenna performance,a new rectifier with high power conversion efficiency and low turn-on voltage is presented. The circuit is implemented in an SMIC 0.18μm EEPROM process. Measurement results show that with a 120kΩ load,the power conversion efficiency reaches as high as 36%. For a sinusoidal wave with magnitude of 0. 5V, the output DC voltage reaches IV,which is high enough for RFID tags. The read distance is as far as 22cm.
