1.37 mm coaxial cable

　　1.37mm coaxial cable is a micro coaxial cable commonly used for radio frequency signal transmission. The following is a detailed introduction:

　　Structure

　　Conductor: usually made of silver-plated copper or tin-plated copper, such as 7 strands of 0.102mm silver-plated annealed copper strands, which have good conductivity and corrosion resistance.

　　Insulation layer: generally made of FEP (fluoroethylene propylene) or PFA (soluble polytetrafluoroethylene), with excellent insulation performance and stable dielectric constant, which can effectively isolate the inner and outer conductors to prevent signal leakage and interference. The outer diameter of the insulation layer is about 0.89mm.

　　Shielding layer: mostly woven from silver-plated or tin-plated copper wires, with a braiding density of usually around 95% - 97%, which can effectively shield external electromagnetic interference and prevent internal signals from radiating outward, ensuring the stability and integrity of signal transmission.

　　Sheath: Generally made of FEP material, it has good resistance to high and low temperatures, wear and chemical corrosion, and can protect the internal structure of the cable from the influence of the external environment. The outer diameter of the sheath is 1.37mm.

　　Electrical characteristics

　　Characteristic impedance: Generally 50Ω, and some special models may have different impedances. This characteristic enables the cable to achieve reflection-free transmission of signals within a specific frequency range, ensuring signal quality.

　　Capacitance: About 95.8pF/m, the size of the capacitance affects the transmission speed and delay of the signal.

　　Attenuation: There are different attenuation values at different frequencies. For example, at 1000MHz, the attenuation can reach 160dB/100m.

　　Voltage standing wave ratio: Generally in the frequency range of 0-6GHz, the voltage standing wave ratio (VSWR) is 1.3, indicating that the cable and the connected device have a good match and can effectively reduce signal reflection6.

　　Advantages

　　Small size: With a diameter of only 1.37mm, it is suitable for applications with demanding space requirements, such as miniaturized electronic devices, portable terminals, etc., and is convenient for wiring and installation in limited spaces.

　　Good flexibility: Compared with some traditional coaxial cables, 1.37mm coaxial cables have better flexibility and can adapt to different installation environments and bending radius requirements without affecting signal transmission. They can be easily bent and twisted, making them easy to construct and maintain.

　　Low loss: In radio frequency signal transmission, it has low signal loss, which can effectively ensure the transmission quality and strength of the signal, so that the signal maintains high integrity and accuracy during transmission, and reduces signal distortion and attenuation.

　　Strong anti-interference ability: The shielding layer can effectively resist external electromagnetic interference and prevent internal signal leakage, ensuring that the signal can still be transmitted stably in a complex electromagnetic environment without being affected by external interference.

　　Application scenarios

　　Wireless communication: widely used in wireless communication systems such as Bluetooth, Zigbee, LTE, Wi-Fi, GPS, etc., as a transmission medium for RF signals, connecting antennas, RF modules, filters and other components to achieve wireless signal reception and transmission.

　　Small electronic devices: such as mobile phones, laptops, digital cameras, tablets, etc., used to connect internal RF circuits, antenna modules, etc., to achieve wireless functions such as Wi-Fi, Bluetooth, GPS positioning, etc.

　　Aerospace and military fields: In applications such as aerospace equipment and military communication equipment that have extremely high requirements for reliability and miniaturization, 1.37mm coaxial cable can be used to transmit various high-frequency signals, such as radar signals, communication signals, etc.

　　Medical equipment: In some medical electronic equipment, such as portable medical monitoring equipment, medical imaging equipment, etc., it is used to transmit RF signals or digital signals to ensure the normal operation of the equipment and data transmission