作者：陈超婵1,2, 桑昱1, 陆福敏1, 赵吉祥2
作者单位：1. 上海计量测试技术研究院, 上海 201203;
2. 中国计量学院电子信息技术研究所, 浙江 杭州 310018
关键词：屏蔽效能; 阶梯电容; 回波损耗; 支撑介质; 阻抗匹配
摘要：
支撑介质常用于固定同轴线的内外导体,保持同心度。在遵循特性阻抗一致、不连续处引起的回波损耗最低以及机械加工误差对电性能影响最小3个方面的原则,通过对固定和支撑屏蔽效能同轴测试装置的支撑介质内外径尺寸、共面补偿厚度、机械加工公差范围的优化选择,重点研究了支撑介质引起的阶梯电容问题,较大程度上补偿了由于阶梯电容产生的回波损耗,最终使装置的回波损耗小于-32 db,满足测试要求。
optimization of brace medium in se coaxial tester
chen chao-chan1,2, sang yu1, lu fu-min1, zhao ji-xiang2
1. shanghai institute of measurement and test technology, shanghai 201203, china;
2. institute of signal and information processing, china jiliang university, hangzhou 310018, china
abstract: brace medium is used to support the outer and inner conductor in coaxial line. according to the rules of consistent characteristic impedance, low return loss in discontinuous sections and the least effect on electrical properties caused by machining error, this paper aims at optimizing the characteristics of brace medium in se (shielding effectiveness) coaxial tester including the size,the thickness of coplanar compensation and mechanical tolerance. it solved the serious problem of step capacitances when using brace medium, and finally compensated the return loss caused by step capacitances in maximum. the less than-32db return loss can meet industrial requirement.
keywords: shielding effectiveness; step capacitance; return loss; brace medium; impedance matching
2010, 36(6): 1-4 收稿日期: 2010-5-25;收到修改稿日期: 2010-8-7
基金项目: 国家自然科学基金(10802082);浙江省自然科学基金(y6090008);上海市科委资助项目(08dz0501800);浙江省自然科学基金杰出青年团队项目(r105248)
作者简介: 陈超婵(1986-),女,浙江苍南县人,硕士研究生,专业方向为屏蔽材料的测试与分析。
参考文献
[1] 程明军,吴雄英,张 宁,等. 抗电磁辐射织物屏蔽效能的测试方法[j]. 印染,2003,9(29):31-35.
[2] astm d 4935-1999,standard test method for measuring the electromagnetic shielding effectiveness of planar materials[s]. 1997.
[3] sj 20524-1995,材料屏蔽效能的测量方法[s]. 北京:中国电子技术标准化研究所,1995.
[4] hong y k, lee c y. method and apparatus to measure electromagnetic interference shielding efficiency and its shielding characteristics in broadband frequency ranges[j]. review of scientific instruments,2003,74(2):1098-1102.
[5] sarto m s, tamburrano a. innovative test method for the shielding effectiveness measurement of conductive thin films in a wide frequency range[j]. ieee transactions on electromagnetic compatibility,2006,5(48): 331-341.
[6] vasquez h l, espinoza k, lozano h, et al. simple device for electromagnetic interference shielding effectiveness measurement[j]. emc ieee emc society newsletter,2009(220):62-68.
[7] mackenzie t e, sanderson a e. some fundamental design principle for the development of precision coaxial standards and component[j]. ieee transactions on microwave theory and techniques,1966,1(14):29-39.
[8] somlo p i. the computation of coaxial line step capacitances[j]. ieee transactions on microwave theory and techniques,1967,1(15):48-53.
[9] whinnery j r, jamieson h w, et al. coaxial-line discontinuities[j]. proceedings of the ire,1944,11(32):695-709.
[10] 杨 毅. 有限差分法在方同轴线仿真中的应用[j]. 西华大学学报:自然科学版,2009,28(5):66-69.
[11] 叶红雨. 同轴电连接器设计要点及计算[j]. 军民两用技术与产品,2008(1):46-48.
