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Development of EMC antennas and their application in on-line SE measurement of conductive composite plastic materials

机译:EmC天线的研制及其在导电复合塑料材料在线sE测量中的应用

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摘要

The development of three new EMC antennas, namely the V-conical-lens antenna (VCLA), half of a Transverse Electromagnetic-T (TEM-T) cell (acting as an antenna) and the Q-loop antenna (a quarter of a loop antenna in front of 90 ° comer reflector) is described. These antennas, when calibrated, are designed with a view to employing them in the measurement of on-line Shielding Effectiveness (SE) of conductive composite materials. Test devices incorporating those newly developed antennas for measuring SE against high impedance and low impedance wave are introduced.ududThe theoretical model of the VCLA is developed and design features are presented as a state-of-the-art project with a view to developing this technique in the near future for measuring the plane wave SE of conductive plastics during their production process.ududA modified TEM-T cell designed to simulate a high impedance field on the material under test (MUT) in its (TEM-T cell's) near field region is presented. The field simulated by this device in the test location is studied theoretically. The device measures the high impedance field SE o f planar sheet-like conductive plastic materials in a situation that attempts to reconstruct the on-line environment likely to prevail in the manufacture o f such plastics. This test device is calibrated by taking into account the background noise, indirect path signal infringement and radiation losses.ududThe newly developed Q-loop antenna is designed to be used to measure the low impedance field SE of conductive plastic materials. An analytical model of the Q-loop antenna is developed using image theory and the theory of pattern multiplication. This model is verified experimentally. Calibration experiments are performed to facilitate applying the antenna in an on-line SE measurement technique.ududA new class of filled composite material with a two dimensional regular array of conductive flakes (like a Frequency Sensitive Surface (FSS)) in plastic resin is proposed. A theoretical model of the suggested configuration is formulated and used to predict SE values. The SE of such material is also determined experimentally and compared with the theoretical predictions. This SE is compared with the SE o f an available filled composite in which the flakes are randomly distributed. The improvement in the shielding capability of the new class of material is highlighted.ududRelative radiation patterns of the developed antennas are measured and compared with predictions. Apart from the anomalies which can be attributed to (simplifying) assumptions made in the development of the theoretical analysis, the measured radiation patterns and other antenna parameters are in good agreement with predictions.
机译:开发了三种新的EMC天线,分别是V锥形透镜天线(VCLA),横向电磁T(TEM-T)单元的一半(用作天线)和Q环形天线(四分之一的天线)描述了90°角反射器前面的环形天线)。校准这些天线时,旨在将它们用于测量导电复合材料的在线屏蔽效果(SE)。介绍了结合了这些新开发的天线的测试设备,用于测量SE对高阻抗和低阻抗波的影响。 ud ud开发了VCLA的理论模型,并提出了一项最新技术设计特征,以期 ud ud经过修改的TEM-T电池,旨在模拟导电塑料(TEM-)中被测材料(MUT)上的高阻抗场,从而在不久的将来开发该技术以测量导电塑料的平面波SE。呈现了T细胞的近场区域。理论上研究了该设备在测试位置上模拟的场。该设备在试图重建可能在这种塑料的制造中普遍存在的在线环境的情况下,测量平面片状导电塑料材料的高阻抗场SE。该测试设备通过考虑背景噪声,间接路径信号侵害和辐射损耗进行校准。 ud ud新开发的Q环形天线设计用于测量导电塑料的低阻抗场SE。利用图像理论和方向图乘法理论建立了Q环形天线的分析模型。该模型已通过实验验证。进行校准实验以促进天线在在线SE测量技术中的应用。 ud ud新型填充复合材料,具有二维规则排列的导电薄片(如频率敏感表面(FSS)),由塑料树脂制成被提议。建立了建议配置的理论模型,并将其用于预测SE值。还可以通过实验确定此类材料的SE,并将其与理论预测值进行比较。将此SE与可用填充复合材料中的SE进行比较,其中薄片随机分布。强调了新型材料屏蔽能力的提高。 ud ud测量了已开发天线的相对辐射方向图,并将其与预测结果进行了比较。除了可以归因于(简化)理论分析发展中的假设的异常外,测得的辐射方向图和其他天线参数与预测也非常吻合。

著录项

  • 作者

    Rahman Hafizur;

  • 作者单位
  • 年度 1994
  • 总页数
  • 原文格式 PDF
  • 正文语种 en
  • 中图分类

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