What are the three types of coaxial cables?

Basic coaxial cable is one of the simplest types of coaxial cable. It consists of an inner conductor, an insulation layer, an outer conductor, and an outer sheath. Internal conductors are usually made of bare copper or aluminum and used to transmit signals or currents. The function of the insulation layer is to isolate the inner and outer conductors, preventing signal interference and energy loss. The outer conductor is usually composed of aluminum foil or tinned copper wire, used to provide shielding effect and reduce external interference. The outermost layer is an outer sheath used to protect the cable from external environmental influences.
Basic coaxial cables are suitable for some basic application scenarios, such as home TV systems, monitoring camera connections, etc. Due to its simple structure, the basic coaxial cable performs well in some short distance, low-frequency transmissions.
The three-layer coaxial cable adds an auxiliary shielding layer on top of the basic coaxial cable, making it have better anti-interference performance. The structure of a three-layer coaxial cable includes an inner conductor, an insulation layer, a first layer conductor, a second layer insulation layer, an outer conductor, and an outer sheath.
The first layer of conductor is a copper wire mesh shielding layer, which provides better electromagnetic shielding effect and reduces the possibility of external interference to the signal. The second insulation layer is used to isolate the copper wire shielding layer and the outer conductor, preventing their mutual influence. The structure of the outer conductor and outer sheath is similar to that of the basic coaxial cable.
Three layer coaxial cables are suitable for scenarios that require high signal quality and are subject to significant external interference, such as cable television, broadband networks, etc. The added shielding layer effectively improves anti-interference performance, enabling stable signal transmission in complex electromagnetic environments.
The five layer coaxial cable is the most complex type of coaxial cable in terms of structure. In addition to the structure of basic coaxial cables and three-layer coaxial cables, a copper foil shielding layer is added between the outer conductor and outer sheath of the five layer coaxial cable. Its structure includes an inner conductor, an insulation layer, a first layer conductor, a second layer insulation layer, a second layer conductor (copper foil shielding layer), a third layer insulation layer, an outer conductor, and an outer sheath.
The copper foil shielding layer provides a stronger electromagnetic shielding effect, further reducing the impact of external interference on the signal. Five layer coaxial cables are suitable for scenarios with high signal quality requirements and complex electromagnetic environments, such as high-definition digital television, satellite communication, and other fields. Its complex structure and advanced shielding technology enable it to perform excellently in long-distance and high-frequency transmission.