In recent years, microstrip antennas have been more widely applied in satellite communications, mobile phones, unmanned aerial vehicle （UAV）, and weapons. A micro-electro-mechanical systems-based （MEMS-based） high...In recent years, microstrip antennas have been more widely applied in satellite communications, mobile phones, unmanned aerial vehicle （UAV）, and weapons. A micro-electro-mechanical systems-based （MEMS-based） high-resistance silicon C-band microstrip antenna array has been designed for the intelligent ammunition. The center frequency is 4.5 GHz. A cavity has been designed in substrate to reduce the dielectric constant of silicon and high-resistance silicon has been used as the material of substrate to improve the gain of antenna. It is very easy to be manufactured by using MEMS technology because of the improved structure of the antenna. The results show that the gain of the antenna is 8 dB and voltage standing wave ratio （VSWR） is less than 2 by the analysis and simulation in high freauencv structure simulator （HFSS）.展开更多
电缆中间接头局部放电是导致交联聚乙烯(XLPE)电力电缆事故的主要原因,因此必须进行电缆中间接头局部放电的研究。电缆接头屏蔽层对高频电磁波信号有屏蔽作用,高频电磁波信号在空间传播过程中还会产生较大衰减,针对用于三相交叉互联的...电缆中间接头局部放电是导致交联聚乙烯(XLPE)电力电缆事故的主要原因,因此必须进行电缆中间接头局部放电的研究。电缆接头屏蔽层对高频电磁波信号有屏蔽作用,高频电磁波信号在空间传播过程中还会产生较大衰减,针对用于三相交叉互联的电缆中间接头屏蔽层是断开的这一特征,进行了电缆接头局部放电的建模、仿真和现场检测。首先,利用高频结构仿真器(High Frequency Structure Simulator,简称HFSS)建立了电缆接头的三维仿真模型,分析了在电缆接头内部发生局部放电时,高频电磁波信号通过屏蔽层断开处辐射出来的强度及其分布特点,验证了采用外置式微带传感器进行电缆接头局部放电检测的可行性。然后设置了电磁场探测线,生成了此线上不同位置处的电磁场变化曲线,分析了不同曲线的幅值情况,得到了信号最强的传感器最佳安装位置。最后,根据微带贴片天线理论,制作了外置式微带传感器,在某电缆线路投运前的交流耐压试验中进行了电磁波检测,验证了仿真结果。展开更多
针对现有的13.56 MHz NFC(Near Field Communication)天线因结构而引起回波损耗偏高的问题,设计了一种工作在13.56 MHz的近场通信天线,通过优化天线结构,有效降低了天线的回波损耗。使用Ansoft HFSS(High Frequency Structure Simulator...针对现有的13.56 MHz NFC(Near Field Communication)天线因结构而引起回波损耗偏高的问题,设计了一种工作在13.56 MHz的近场通信天线,通过优化天线结构,有效降低了天线的回波损耗。使用Ansoft HFSS(High Frequency Structure Simulator)进行天线模型的设计以及仿真分析,对NFC天线的3大结构参数(天线边长L_x、线间距S和线径W)进行了仿真分析探究,最后得到以13.56 MHz为中心频率的最优天线结构参数,即L_x=40 mm,S=1 mm和W=0.5 mm。在上述天线结构参数下,优于已有的NFC天线(回波损耗为-22.2 d B),其回波损耗降低至-28.8 d B,-10 d B以下的带宽为0.8 MHz。展开更多
基金supported by the Chinese PLA General Armament Department under Grant No.51318020305
文摘In recent years, microstrip antennas have been more widely applied in satellite communications, mobile phones, unmanned aerial vehicle （UAV）, and weapons. A micro-electro-mechanical systems-based （MEMS-based） high-resistance silicon C-band microstrip antenna array has been designed for the intelligent ammunition. The center frequency is 4.5 GHz. A cavity has been designed in substrate to reduce the dielectric constant of silicon and high-resistance silicon has been used as the material of substrate to improve the gain of antenna. It is very easy to be manufactured by using MEMS technology because of the improved structure of the antenna. The results show that the gain of the antenna is 8 dB and voltage standing wave ratio （VSWR） is less than 2 by the analysis and simulation in high freauencv structure simulator （HFSS）.
文摘电缆中间接头局部放电是导致交联聚乙烯(XLPE)电力电缆事故的主要原因,因此必须进行电缆中间接头局部放电的研究。电缆接头屏蔽层对高频电磁波信号有屏蔽作用,高频电磁波信号在空间传播过程中还会产生较大衰减,针对用于三相交叉互联的电缆中间接头屏蔽层是断开的这一特征,进行了电缆接头局部放电的建模、仿真和现场检测。首先,利用高频结构仿真器(High Frequency Structure Simulator,简称HFSS)建立了电缆接头的三维仿真模型,分析了在电缆接头内部发生局部放电时,高频电磁波信号通过屏蔽层断开处辐射出来的强度及其分布特点,验证了采用外置式微带传感器进行电缆接头局部放电检测的可行性。然后设置了电磁场探测线,生成了此线上不同位置处的电磁场变化曲线,分析了不同曲线的幅值情况,得到了信号最强的传感器最佳安装位置。最后,根据微带贴片天线理论,制作了外置式微带传感器,在某电缆线路投运前的交流耐压试验中进行了电磁波检测,验证了仿真结果。
文摘针对现有的13.56 MHz NFC(Near Field Communication)天线因结构而引起回波损耗偏高的问题,设计了一种工作在13.56 MHz的近场通信天线,通过优化天线结构,有效降低了天线的回波损耗。使用Ansoft HFSS(High Frequency Structure Simulator)进行天线模型的设计以及仿真分析,对NFC天线的3大结构参数(天线边长L_x、线间距S和线径W)进行了仿真分析探究,最后得到以13.56 MHz为中心频率的最优天线结构参数,即L_x=40 mm,S=1 mm和W=0.5 mm。在上述天线结构参数下,优于已有的NFC天线(回波损耗为-22.2 d B),其回波损耗降低至-28.8 d B,-10 d B以下的带宽为0.8 MHz。
