你知道同轴电缆的用途吗？

同轴电缆是由两根同心导体、导体和屏蔽层共同组成的电缆。同轴式电缆最常见的是由绝缘材料隔离的铜导线组成，在里层绝缘材料的外部是另一层环状导体，以及绝缘体，然后将整个电缆包裹在聚氯乙烯或特氟纶材料的护套中。同轴电缆广泛应用于射频或音视频的传输，传输阻抗一般为75Ω，已成为视频传输的标准阻抗。高质量标准的同轴电缆一般比双绞线价格昂贵，因为同轴电缆具有可靠的物理性能，可以为音视频提供良好的性能。频率、分辨率和电缆的有效传输距离对音视频系统的性能有着举足轻重的影响。

Coaxial cable is composed of two concentric conductors, conductor and shielding layer. The most common coaxial cable is composed of copper wires isolated by insulating material. On the outside of the inner insulating material is another layer of ring conductor and insulator, and then the whole cable is wrapped in PVC or Teflon sheath. Coaxial cable is widely used in radio frequency or audio and video transmission. The transmission impedance is generally 75 Ω, which has become the standard impedance of video transmission. High quality standard coaxial cable is generally more expensive than twisted pair, because coaxial cable has reliable physical properties, which can provide good performance for audio and video. Frequency, resolution and effective transmission distance of cable have a significant impact on the performance of audio and video system.

SYV-50-2-1实心聚乙烯同轴电缆

Syv-50-2-1 solid polyethylene coaxial cable

从用途上，同轴电缆又分为：RG-58、粗缆RG-11两种。及很少用到的半刚型同轴电缆及馈管。

From the use, coaxial cable is divided into: rg-58, thick cable rg-11 two kinds. And rarely used semi-rigid coaxial cable and feeder.

粗缆绳：粗缆绳(RG-11)直径1.27厘米， 传输距离可达500米。因为RG-11的直径相当粗，所以它的弹性也较差，也不适合在室内狭小的环境下架设，同时RG-11接头的制作方法也比较复杂，而且还不能直接与电脑连接，需要通过转接器转成AUI接头，然后再接到电脑上。因为粗绳具有更强的强度和 的传输距离，所以粗绳的主要作用就是充当网络 ，把许多细绳连接在一起，形成细绳。粗缆的阻抗为75Ω。

Thick cable: the diameter of the thick cable (rg-11) is 1.27cm, and the maximum transmission distance can reach 500m. Because the diameter of rg-11 is quite thick, its elasticity is also poor, and it is not suitable to be erected in the narrow indoor environment. At the same time, the manufacturing method of rg-11 connector is relatively complex, and it can not be directly connected with the computer, so it needs to be converted into AUI connector through the adapter, and then connected to the computer. Because the thick rope has stronger strength and the largest transmission distance, the main function of the thick rope is to act as the network center, connecting many ropes together to form a rope. The impedance of thick cable is 75 Ω

细缆:细缆直径为0.26厘米， 传输距离为185米，使用时与50ω终端电阻、t型连接器、BNC连接器连接到网卡，线材价格和连接器成本较低，且无需购买集线器等设备，因此但电缆线路的

度不能超过185米，否则信号会严重衰减。细缆的阻抗为50Ω。

Thin cable: the diameter of the thin cable is 0.26cm, the maximum transmission distance is 185m, and it can be used with 50 meters ω The terminal resistance, T-type connector and BNC connector are connected to the network card, so the wire price and connector cost are low, and there is no need to buy the hub and other equipment, so the length of the cable line should not exceed 185m, otherwise the signal will be seriously attenuated. The impedance of the thin cable is 50 Ω.

半刚性同轴电缆：这种电缆很少用，通常是用在通信发射机内部的模块化连接上，因为这种电缆的传输损耗很小，但它也有一些缺点，如“坚硬不易弯曲”。另外，这种电缆的极高传输频率大多能达到30Ghz。如：CXJ--505-3这类电缆的典型结构如下表所示，结构材料直径(mm)1.内部导体镀银铜线0.932.绝缘体聚四氟乙烯(PTFE)3.003.外导体。

Semi rigid coaxial cable: this kind of cable is rarely used, usually used in the modular connection inside the communication transmitter, because the transmission loss of this kind of cable is very small, but it also has some disadvantages, such as "hard and not easy to bend". In addition, the extremely high transmission frequency of this kind of cable can reach 30ghz. For example, the typical structure of cxj -- 505-3 cable is shown in the table below, the diameter of structural material (mm) is 1. The inner conductor is silver plated copper wire 0.932. The insulator is polytetrafluoroethylene (PTFE) 3.003. The outer conductor is copper wire 0.932.

①3.58镀锡(合金)无缝铜管。

① 3.58 tin (alloy) seamless copper pipe.

②无缝退火紫铜管

② Seamless annealed copper tube

③镀银无缝紫铜管

③ Silver plated seamless copper tube

当前同轴电缆的工艺技术也在逐步进步，而且弯曲幅度较大的这类线材，建议在对柔韧性要求不高的地方，尽量采用这种传统的铜管外导体，以保证其稳定性。

At present, the technology of coaxial cable is also gradually improving, and it is suggested that the traditional copper tube outer conductor should be used where the flexibility requirement is not high, so as to ensure its stability.

本文内容摘常州宇捷新材料科技有限公司（http://yjxclkj.cn）是同轴电缆公司，如需转载请标明出处。

Changzhou Yujie New Material Technology Co., Ltd. (http://yjxclkj.cn)It's a coaxial cable company. If you need to reprint, please indicate the source.