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本征电磁混响室既继承了混响室的优点,又能克服机械搅拌混响室效率低、电子搅拌混响室不能进行辐射发射测试和低频性能较差的问题,是大型装备系统/设备级EMC试验场地最有希望的研究方向之一。根据本征电磁混响室的基本结构和工作原理,分析了本征电磁混响室在理论研究、结构设计和测试应用中需要解决的本征电磁混响室电磁场的模式理论与统计分布规律、腔体几何外形与散射器的结构优化、性能指标分析与评估、数值仿真、测试应用方法与流程等方面的关键技术及其研究思路和方法,为本征电磁混响室技术的研究提供一定的参考和借鉴。 相似文献
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应用新型混响室技术进行电磁辐射和抗干扰检测 总被引:14,自引:0,他引:14
混响室能模拟较复杂的电磁环境,产生较均匀的电磁场,是一种经济有效的新型辐射和抗干扰检测技术.文章介绍了混响室的原理和结构,对混响室的校准步骤和抗干扰性测量方法作了详细论述. 相似文献
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通信系统高速采集技术随着信号的升降时间变短、信号频率和边沿速度提高、信号速率的提高和芯片尺寸的减少会受到处于同一电磁环境中其他系统或设备的电磁发射导致性能下降.在系统设计阶段开展EMC工作,避免可能出现的电磁兼容问题,且可以使PCB设计成本变低.本文介绍了现有EMC分析的电磁场求解方法及常用的EMC仿真技术及软件并对实际电路进行了示例分析,分析结果有利于指导硬件开发人员对PCB的EMC设计. 相似文献
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提出了双天线激励混响室的方法,研究了双天线激励对混响室场性能的影响。分析了双天线改善混响室场均匀性的原理,对单天线激励下的混响室模型以及处于不同位置的双天线激励下的混响室模型进行了仿真计算,从场均匀性和场强两个方面研究了双天线对混响室场性能的影响,对双天线影响场强的机理进行了分析。研究表明:采用双天线激励改善了混响室工作区域的场均匀性;采用双天线可以降低对功率放大器的要求,降低大型混响室测试成本。最后对双发射天线在大型混响室中的应用进行了探讨和展望。 相似文献
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复杂战场电磁环境模拟技术研究 总被引:2,自引:0,他引:2
提出了以静电放电信号作为激励源,利用混响室特点产生宽频带、多极化、多模式、随机相位的强电场来模拟战场电磁环境的方法.并阐述了试验机理,给出了模拟战场电磁环境的试验方法和试验配置,得到了相关测试结果,并对测试结果进行了细致分析,得出了模拟战场电磁环境试验所产生场的有关频谱、场强和场均匀性的结论. 相似文献
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在射频工程中正确理解掌握天线和电磁场概念有着显而易见的重要性,天线捕获信号及电磁场有效传播是我们首要的追求目标。有效掌握射频技术,对于处理各种电子产品包括数字系统的电磁兼容性(EMC)问题帮助很大。电磁兼容性(EMC)设计专注于切断电路生成无意的电磁辐射和离散的电磁场;电磁兼容性(EMC)也同样致力于阻截来自周围环境的电磁波场对设备本身的电路破环(电磁敏感性)。 相似文献
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A closer look at reverberation Chambers - 3-D Simulation and experimental verification 总被引:4,自引:0,他引:4
This paper presents three-dimensional (3-D) full-wave simulations of the electromagnetic field inside a medium-sized reverberation chamber. A frequency-domain method-of-moments approach based on the electric field integral equation is used. A synopsis of the computational challenges particular for reverberation chambers is described and a detailed overview on the chamber modeling procedure is given. The electric field inside the chamber is computed and the influence of small geometric details and asymmetries is investigated as well as the effect of different excitations and stirrers. It is demonstrated that a statistics-based validation of reverberation chamber simulations is insufficient. To validate simulation results, therefore extensive near-field measurements inside the prototype reverberation chamber are performed. The complete 3-D reverberation chamber simulation, considering stirrers, door, and various practical excitations, accurately predicts the fields within the chamber in the important lower-to-medium frequency range and thus represents a reliable tool facilitating reverberation chamber optimization. 相似文献
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混响室校准与辐射抗扰度测试 总被引:1,自引:0,他引:1
在对混响室的基本原理进行简要介绍的基础上,依据标准IEC61000-4-21中的规定,对混响室的校准方法及操作过程进行了详细介绍和分析,并对在混响室内进行辐射抗扰度测试的方法及步骤进行了介绍。 相似文献
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《Electronics letters》2008,44(17):1002-1003
Using the reverberation chamber to obtain antenna radiation efficiency is considered. The reverberation chamber, which has for many years been used for electromagnetic compatibility measurements, can also be used with great advantage for antenna measurements since it simulates effectively a uniform multipath propagation environment. How a reverberation chamber can be used to measure the ultra-wideband (UWB) antenna efficiency in a very short time is described. The procedure based on time domain is described and some experimental results are given and compared to measurements obtained by the Wheeler cap method extended by Schantz to UWB antennas. 相似文献
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为解决混响室大体积与场性能高要求之间的矛盾,提出了一种基于镜像原理的多馈源混响室的设计思想,从原理上分析了镜像多馈源混响室的可行性和有效性,并通过仿真计算研究了镜像双馈源混响室的场性能.结果表明,在输入功率一定时,两个单混响室系统组合成镜像双馈源混响室后,在工作区域的场均匀性能不下降的基础上,不但可用于电磁兼容测试的工作区域体积大幅度增大,而且测试区域的电场强度也得到了提高.同时,对镜像多馈源混响室进行了进一步的扩展分析,得出了组成镜像多馈源混响室的单混响室系统数量的理论表达式. 相似文献
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采用有限元方法研究二维混波室结构辐射电流和测量的辐射场平均值的关系,目的是了解混波室测量环境是否能够满足电磁兼容辐射测量的要求.从二维数值计算结果可以看到,观测场的平均值和辐射电流具有很好的线性关系,从而证明混波室可以作为电磁兼容辐射测量的一个有效测试设备. 相似文献
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Shielding effectiveness in a two-dimensional reverberation chamber using finite-element techniques 总被引:2,自引:0,他引:2
A reverberation chamber is an enclosure consisting of metal walls with a metallic paddle wheel (denoted as a "stirrer" or "tuner") forming a high quality-factor (Q) cavity with continuously variable boundary conditions. Reverberation chambers are attaining an increased importance in determining the electromagnetic susceptibility of avionics equipment. Given the nature of the variable boundary condition, the ability of a given source to couple energy into certain modes and the passband characteristic due the chamber Q, the fields are typically characterized by statistical means. The emphasis of this work is to apply finite-element techniques at cutoff to the analysis of a two-dimensional structure to examine the notion of shielding-effectiveness issues in a reverberating environment. Simulated mechanical stirring is used to obtain the appropriate statistical field distribution. The shielding effectiveness (SE) in a simulated reverberating environment is compared to measurements in a reverberation chamber. A log-normal distribution for the SE is observed with implications for system designers. The work is intended to provide further refinement in the consideration of SE in a complex electromagnetic environment. 相似文献