通风孔对混响室场均匀性的影响  

Influence of Vents on Field Uniformity of Reverberation Chamber

作　　者：陈亮[1] 余志勇[1] 滕向如 刘栋 

机构地区：[1]第二炮兵工程大学,西安710025

出　　处：《科学技术与工程》2015年第34期1-6,共6页Science Technology and Engineering

基　　金：国家自然科学基金(61201120)资助

摘　　要：在混响室场均匀性和校准的基础上,从能量的角度出发,数值分析不同形状、大小和占空比(镂空面积与孔面总面积之比)通风孔对混响室内部电磁能量的泄漏和均匀性的影响。相较方形孔,圆形孔的电磁泄漏更小,场强标准方差相差11.15d B;孔面积越小,占空比越小,泄漏越小,标准方差分别相差12.75 d B和19.02 d B。以实验室混响室为研究对象进行实际测试,减小通风孔占空比很好地改善了混响室场均匀性。数值分析和实测结果表明:通风孔是混响室内外电磁能量耦合的主要通道之一,影响到混响室内的局部能量密度和总场均匀性;孔的形状、面积和占空比是其影响因素,且占空比占主要地位。Influence of vents with different shape, area and coverage （ ratio of area of hollow part to total area of hole plane） on electromagnetic energy leakage and field uniformity of reverberation chamber was analyzed numerically from the point of energy based on field uniformity and calibration of reverberation chamber. Electromagnetic leakage of circular holes is smaller than square holes, the difference of standard deviation of the two is 11.15 dB, and the smaller the area of hole, coverage, the smaller the electromagnetic leakage, the differences of standard deviation are 12. 75 dB and 19.02 dB respectively. Practical test was performed on the reverberation chamber of ourselves laboratory, the uniformity of reverberation chamber is improved very well because of the decrease of coverage of vents. Numerical analysis and practical test result show that vent is one of the main channels of electromagnetic energy coupling in and out of reverberation chamber, which influences on the local energy density and total field uniformity ; shape, area and coverage of vent are the influence factors, what＇s more, coverage is the main one.

关 键 词：混响室 场均匀性 校准 通风孔 形状 面积 占空比 

分 类 号：O441.5[理学—电磁学]