Five "knowledge points" about semi-rigid cables(3)

4. Phase stability

Since semi-rigid coaxial cables are made of high-quality materials, they have extremely high electrical stability compared with flexible coaxial cables with braided outer conductors. The properties of metals and dielectric materials change with temperature, so for many critical systems, the use of phase-stable cables is extremely important. In addition, in systems that need to control the phase length, phase-matched semi-rigid cables are often used. This is especially true for antenna systems equipped with phased array antennas. This is because, in this type of antenna system, the phase of the input signal plays an important role in electrically controlling the main beam of the antenna array. Modern mobile communication systems use this technology to optimize coverage under changing conditions to achieve the goal of reducing the number of antennas required for system performance optimization.

5.Low passive intermodulation (PIM)

Semi-rigid cable assemblies are usually made of non-ferrous materials (mainly copper). When the appropriate connector is selected, this type of copper tube semi-rigid coaxial cable has extremely excellent passive intermodulation performance, making it a modern multi-frequency wireless communication system including distributed antenna system (DAS) related equipment Ideal choice. With the increasing demand for complete coverage, distributed antenna systems require the use of more types of low passive intermodulation products including power splitters, combiners, amplifiers and even high-end test equipment. Since the semi-rigid cable assembly can simultaneously meet the RF power and passive intermodulation requirements of modern wireless communication systems, it becomes the best configuration for distributed antenna applications.

Concluding remarks

All in all, semi-rigid cable assemblies are vital microwave devices that are active in countless radio frequency applications around the world today. Although semi-rigid technology is not a new technology, due to its broadband characteristics, reliable electrical performance and phase stability, semi-rigid components are still a popular choice for engineers.

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1. Five "knowledge points" about semi-rigid cables(1)

2. Five "knowledge points" about semi-rigid cables(2)