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同轴传输线、同轴连接器、射频电缆组件 工程设计参考资料 中国电子科技集团公司第四十研究所马乃祉 D:外导体内径 d:内导体外径 εr:介质相对介电常数 μr:介质相对导磁系数 图1 表1常用介质材料的电性能参数(25℃、标准大气压) 介质材料常用标记介电强度(伏/密耳)相对介电常数εr(103Hz)正切损耗角tgδ(100MHZ)空气air8010聚乙烯PE4802.35×10-3交联聚乙烯IMP7002.35×10-3聚四氟乙烯TFE4802.051×10-4氟化乙烯丙烯FEP5002.052×10-4聚酰亚胺(改性)PI5603.422×10-3聚丙烯(共聚)500~6602.25~2.305×10-4聚苯乙烯POLY5002.555×10-4苯乙烯聚苯撑氧MPPO5002.73×10-3聚苯撑硫/聚苯撑氧PPS/PPO6003.33×10-3改性聚苯醚5002.643×10-3 1、特性阻抗,Z0(殴姆) 精确计算: 2、单位长度电容C、电感L (pF/英呎) (μH/英呎)1英呎=0.3048米 3、理论截止频率fc (GHZ) λc:截止波长 C0:真空中的光速,精确值为299792458±1.2(米/秒) 精确计算: 表2同轴传输线截止频率与相近连接器对照表(50Ω) 公称尺寸同轴传输线外导体内径(Dmm)截止频率(GHZ)相近的通用连接器连接器使用上限频率(GHZ)εr=1εr=1.5εr=2εr=2.05168.487.306.586.527/1661211.319.748.788.69UHF41112.3410.759.579.49HN61013.5711.6810.5310.44SC11816.9714.61213.1613.04BNC4719.3916.6915.0414.9N APC-7186.520.8918.2016.2016.06TNC11622.6219.4817.5517.40ATNC18527.1523.3721.0620.88433.9429.2226.3226.10SMA BMA26.53.538.7833.3930.0829.82APC-3.533345.2538.9635.134.79SSMA352.9246.4940.0336.0635.752.9、SMK(K)402.456.5648.7043.8843.492.450267.8858.4452.6552.161.8573.3863.1856.9256.421.85(V)651135.76116.89105.31104.381.0(M)110D/d2.3012.7753.24953.294、传播速率VP 5、延时Tns (ns/英吋) 6、驻波参数 反射系数ReflectionCoefficient(Γ) 反射损耗ReturnLoss(dB) 电压驻波比VSWR(ROS) 表3VSWR、Γ、Loss换算表 VSWRΓLoss(dB)VSWRΓLoss(dB)17.39100.891311.08500.0282318.72420.794321.05150.0251325.84800.707931.04580.0224334.41940.631041.04070.0200343.56980.562351.03620.0178353.00950.501261.03220.0158362.61460.446771.02870.0141372.32290.398181.02550.0126382.09990.354891.02270.0112391.92500.3162101.02020.0100401.78490.2818111.01800.0089411.67090.2512121.01600.0079421.57690.2239131.01430.0071431.49850.1995141.01270.0063441.43260.1778151.01130.0056451.37670.1585161.01010.0050461.32900.1413171.00900.0045471.28800.1259181.00800.0040481.25280.1122191.00710.0035491.22220.1000201.00630.0032501.19570.0891211.00570.0028511.17260.0794221.00500.0025521.15240.0708231.00450.0022531.13470.0631241.00400.0020541.11920.0562251.00360.0018551.10550.0501261.00320.0016561.09350