1.13 mm coaxial cable low loss

　　There are many key points in the 1.13 mm coaxial cable in terms of achieving low-loss transmission, from manufacturing process to practical application. In the manufacturing process, the selection of conductor material, insulation material and shielding structure is crucial.

　　High-quality 1.13 mm coaxial cable usually uses high-purity oxygen-free copper as the inner conductor. This material has low resistance and can effectively reduce heat loss during signal transmission. For example, oxygen-free copper inner conductors with a purity of more than 99.99% can reduce the resistance loss of signals during transmission by about 20% - 30% compared with ordinary copper materials. For the insulation layer, physical foamed polyethylene materials are often used. Its unique foaming structure makes the insulation layer have a lower dielectric constant, generally between 1.4 and 1.6, which greatly reduces the loss caused by dielectric polarization during signal transmission. Accurate control of the foaming degree is the key. The appropriate foaming degree (such as 60% - 70%) can achieve lower signal attenuation while ensuring the mechanical properties of the cable.

　　The shielding structure should not be ignored. 1.13 mm coaxial cables mostly use a multi-layer shielding design. The most common method is to combine an aluminum foil shielding layer with a braided mesh shielding layer. The aluminum foil shielding can effectively block low-frequency interference, while the braided mesh shielding has a good inhibitory effect on high-frequency interference. The braided mesh of some high-end cables uses silver-plated copper wire, and its shielding effect is about 15% - 20% higher than that of ordinary copper wire braided mesh. It can better resist external electromagnetic interference, reduce signal leakage, and thus reduce loss.

　　In practical applications, in order to give full play to the low-loss characteristics of 1.13 mm coaxial cables, attention should be paid to the laying and use environment of the cables. When laying, the bending radius of the cable should be strictly controlled. Since 1.13 mm cables are relatively thin, their minimum bending radius is generally recommended to be 5 - 8 times the outer diameter of the cable, that is, 5.65 - 9.04 mm. If the bending radius is too small, the inner conductor and insulation layer will be deformed, the characteristic impedance of the cable will be changed, and the signal reflection and loss will be increased. For example, when the bend radius is less than half of the recommended value, signal loss may increase by 3 - 5 dB.

　　In addition, the temperature and humidity of the use environment will also affect the cable loss. Generally speaking, the operating temperature range of 1.13 mm coaxial cable is between - 40℃ and +85℃. In a high temperature environment, the performance of the insulating material will change, resulting in an increase in the dielectric constant and an increase in signal loss. When the ambient temperature rises from 25℃ to 65℃, the signal loss may increase by 10% - 15%. In a high humidity environment, moisture may penetrate into the cable, affecting the insulation performance and also increasing the signal loss. Therefore, when used outdoors or in a humid environment, cables with good waterproof and moisture-proof properties should be selected, and protective measures should be taken, such as sealing the connector with waterproof tape.