In this paper two proposed methods of input impedance calculation for Bow-Tie antenna are introduced. The proposed methods show input impedance calculation with high accuracy. Also, design curves for input impedance v...In this paper two proposed methods of input impedance calculation for Bow-Tie antenna are introduced. The proposed methods show input impedance calculation with high accuracy. Also, design curves for input impedance values were developed depending on the geometry of antenna. The proposed design curves are used to design a Bow-Tie type RFID tag antenna. The input impedance of the tag antenna is calculated using proposed methods and compared with that obtained using CST studio suite 2014 and IE3D Zeland version 12.0 software packages. The results are investigated and discussed. The tag antenna is fabricated, measured and the obtained input impedance is compared with the simulation and the proposed methods. Good agreement among measured input impedance and that simulated by CST, IE3D or proposed methods is obtained.展开更多
Radio-frequency identification(RFID)antennas are critical components in wireless communication networks for the Internet of things(IoT).The RFID systems make it possible to realize the dynamic interconnection of vario...Radio-frequency identification(RFID)antennas are critical components in wireless communication networks for the Internet of things(IoT).The RFID systems make it possible to realize the dynamic interconnection of various things.To better summarize the operating principles of the RFID antennas and associate antennas with specific complex applications,a review of RFID systems and antennas is necessary.In this paper,a review of reader antennas for ultra-high frequency(UHF)RFID systems is presented,and the categories of RFID systems are summarized for the first time.The antennas are classified according to the reading region and operating principle.The reading region determines the most crucial performance that should be concentrated on when designing an antenna,while the operating principle affects the current distribution on the surface of the antenna,and further the electromagnetic radiation.By the summary of the RFID systems and antennas,the understanding of future researchers on the operating principles of the RFID antennas could be facilitated,which can be helpful in the advanced design and implementation of RFID antennas.In addition,taking engineering requirements into account,the future prospective of RFID applications is discussed,as well as the challenges to be addressed.展开更多
文摘In this paper two proposed methods of input impedance calculation for Bow-Tie antenna are introduced. The proposed methods show input impedance calculation with high accuracy. Also, design curves for input impedance values were developed depending on the geometry of antenna. The proposed design curves are used to design a Bow-Tie type RFID tag antenna. The input impedance of the tag antenna is calculated using proposed methods and compared with that obtained using CST studio suite 2014 and IE3D Zeland version 12.0 software packages. The results are investigated and discussed. The tag antenna is fabricated, measured and the obtained input impedance is compared with the simulation and the proposed methods. Good agreement among measured input impedance and that simulated by CST, IE3D or proposed methods is obtained.
文摘针对近场长天线的电流相位分布空间跨度大这一难点,设计了一款基于多电容加载的超高频(Ultra-high frequency,UHF)频段近场长天线。通过对长度为250mm微带传输线在间隔48.8mm处分段加载1.6pF电容,利用电容对电流的相位补偿作用改善了天线近场均匀性。在端口增加金属匹配枝节及负载电阻进行阻抗匹配。仿真及实测表明,该长天线回波损耗在918~933 MHz频段内低于-10dB,长天线正上方300mm处近场场强差值最大仅为3.2dB,天线正上方不同位置处最大读取距离差值波动不超过95mm,验证了该天线良好的近场均匀性。搭建射频识别(Radio frequency identification,RFID)系统并进行测试,进一步验证该款长天线在近距离RFID系统中的实用性。
基金supported by the National Natural Science Foundation of China(61971051)。
文摘Radio-frequency identification(RFID)antennas are critical components in wireless communication networks for the Internet of things(IoT).The RFID systems make it possible to realize the dynamic interconnection of various things.To better summarize the operating principles of the RFID antennas and associate antennas with specific complex applications,a review of RFID systems and antennas is necessary.In this paper,a review of reader antennas for ultra-high frequency(UHF)RFID systems is presented,and the categories of RFID systems are summarized for the first time.The antennas are classified according to the reading region and operating principle.The reading region determines the most crucial performance that should be concentrated on when designing an antenna,while the operating principle affects the current distribution on the surface of the antenna,and further the electromagnetic radiation.By the summary of the RFID systems and antennas,the understanding of future researchers on the operating principles of the RFID antennas could be facilitated,which can be helpful in the advanced design and implementation of RFID antennas.In addition,taking engineering requirements into account,the future prospective of RFID applications is discussed,as well as the challenges to be addressed.
