Why does the military industry use phase stable cables?

RF coaxial cable assembly is a section of transmission line that connects RF coaxial connector and RF coaxial cable, through a certain way to connect the two together. Users should have the necessary understanding of the cable and connector when choosing the cable assembly. The understanding of the cable should include the structure size, mechanical properties, use frequency, attenuation, etc., while the understanding of the connector should include the structure of the connector, the materials used, the interface connection method, the use frequency range, etc., and then choose the suitable connection solution according to their needs.

                                     
According to the use of the use, such as when the phase stable cable used as an antenna cable, the time and direction of signal arrival (i.e., phase) to meet certain requirements. Due to the cable material and processing technology, phase stable cable in each point of the propagation rate can not absolutely do exactly the same, so the signal through the same physical length of the cable will have a certain time and direction difference, then it needs to use the electrical length to determine the length of the cable, the electrical length of the characteristics used is the phase. Phase matching is used to describe the ability of two or more phase stable cable assembly has the same phase length, more accurately said that the electrical length matching. Phase matching is divided into two types.
1. relative matching: cable assemblies between the same batch match each other.
2, absolute matching: the absolute phase of the cable assembly is matched to a predetermined value.

                                       
For example, the phased array radar or missile equipment deployed in the plateau area, due to the great temperature difference between day and night on the plateau, will lead to temperature changes in the range beyond the range of ordinary cables, resulting in a large phase change, the received signal will produce a certain delay. Therefore, compared with other types of cables, phase stable cable is superior in performance index and flexibility. Therefore, phase stable cable is very frequently used in military radar applications.
                                       

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