SYV RF coaxial cable material characteristics and classification
2023-08-13 09:12:59
SYV RF coaxial cable is a cable that transmits electromagnetic energy in the radio frequency range. The RF cable is an indispensable component in various radio communication systems and electronic devices. It is widely used in wireless communication and broadcasting, television, radar, navigation, computer and instrumentation. Applications. It can transmit a wide frequency band to defend against outside interference. Small antenna effect, small radiation loss, simple structure, convenient installation, and comparative economic classification: The structure of RF cables is various and can be classified according to different methods and types.
Coaxial RF Cables Coaxial RF cables are the most common type of construction. Because the inner and outer conductors are in concentric positions, the electromagnetic energy is limited to propagate in the medium between the inner and outer conductors, and thus has significant advantages such as low attenuation, high shielding performance, use of frequency bandwidth, and stable performance. It is usually used to transmit RF energy from 500 kHz to 18 GHz. At present, commonly used RF coaxial cables have two types of 50Ω and 75Ω RF coaxial cables. Characteristic impedance 75Ω RF coaxial cable is commonly used in CATV networks, so it is called a CATV cable and has a transmission bandwidth of up to 1GHz. Currently, the transmission bandwidth of commonly used CATV cables is 750MHz.
Symmetrical RF Cable Symmetrical RF cable loops have an open electromagnetic field. Due to radiated electromagnetic energy at high frequencies, attenuation is increased, resulting in poor shielding performance. In addition to the influence of atmospheric conditions, it is often used less frequently. Symmetric RF cables are mainly used in low RF or symmetrical feeds.
Spiral RF cable Coaxial or symmetrical cable conductor, sometimes spiral coil shape, in order to increase the cable inductance, thereby increasing the cable's wave impedance and delayed electromagnetic energy transmission time, the former known as high-impedance cable, The latter is called a delay cable. If the density of the spiral coil wound in the length direction is different, a variable resistance cable can be made.
SYV RF coaxial cable is classified according to insulation type. (1) Physically insulated cables are filled with the solid high-frequency dielectric between the inner and outer conductors of this type of cable. Most of the soft coaxial RF cables use this type of insulation.
(2) In the insulating layer of air-insulated cable and cable, most of the volume except the solid medium supporting the inner and outer conductors is air. Its structural feature is that it can pass from one conductor to another without passing through the dielectric layer. Air-insulated cables have very low attenuation and are commonly used in UHF.
(3) Half-air insulated cable This type of construction is an insulated version of the above two types, the insulation of which is also a combination of air and solid media, but the passage from one conductor to the other is through the solid dielectric layer. .
Coaxial RF Cables Coaxial RF cables are the most common type of construction. Because the inner and outer conductors are in concentric positions, the electromagnetic energy is limited to propagate in the medium between the inner and outer conductors, and thus has significant advantages such as low attenuation, high shielding performance, use of frequency bandwidth, and stable performance. It is usually used to transmit RF energy from 500 kHz to 18 GHz. At present, commonly used RF coaxial cables have two types of 50Ω and 75Ω RF coaxial cables. Characteristic impedance 75Ω RF coaxial cable is commonly used in CATV networks, so it is called a CATV cable and has a transmission bandwidth of up to 1GHz. Currently, the transmission bandwidth of commonly used CATV cables is 750MHz.
Symmetrical RF Cable Symmetrical RF cable loops have an open electromagnetic field. Due to radiated electromagnetic energy at high frequencies, attenuation is increased, resulting in poor shielding performance. In addition to the influence of atmospheric conditions, it is often used less frequently. Symmetric RF cables are mainly used in low RF or symmetrical feeds.
Spiral RF cable Coaxial or symmetrical cable conductor, sometimes spiral coil shape, in order to increase the cable inductance, thereby increasing the cable's wave impedance and delayed electromagnetic energy transmission time, the former known as high-impedance cable, The latter is called a delay cable. If the density of the spiral coil wound in the length direction is different, a variable resistance cable can be made.
SYV RF coaxial cable is classified according to insulation type. (1) Physically insulated cables are filled with the solid high-frequency dielectric between the inner and outer conductors of this type of cable. Most of the soft coaxial RF cables use this type of insulation.
(2) In the insulating layer of air-insulated cable and cable, most of the volume except the solid medium supporting the inner and outer conductors is air. Its structural feature is that it can pass from one conductor to another without passing through the dielectric layer. Air-insulated cables have very low attenuation and are commonly used in UHF.
(3) Half-air insulated cable This type of construction is an insulated version of the above two types, the insulation of which is also a combination of air and solid media, but the passage from one conductor to the other is through the solid dielectric layer. .
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