What is the attenuation of phase stable cable?

Phase stable cable's conductor is generally made of silver-plated soft copper wire; insulation is made of multi-layer microporous PTFE film wrapping; outer conductor is made of silver-plated copper flat tape wrapping plus silver-plated round copper wire braided double shielding structure; sheath is made of extruded PTFE resin. The product has the performance of low loss, high phase stability and high power, ensuring the precise positioning of aviation phased array radar, satellite tracking stations, electronic countermeasures and other equipment.

The phase stability of phase stable cable contains both temperature and mechanical aspects. Under different ambient temperatures, the mechanical length change caused by the line extension and expansion of the inner and outer conductor metals and the phase shift constant change caused by the change of the equivalent dielectric constant of the insulation material will lead to the change of the total phase; in addition, the cable is subjected to mechanical external forces such as bending, twisting and vibration, which will cause the dimensional change and structural variation of the components that make up the cable to be misaligned, resulting in the change of the electrical length, thus causing the change of the phase. Phase change.

With the full-scale localization of phase stable cable, the domestic manufacturers have got a better control of phase stability through the selection of cable raw materials, optimization of the winding process, plus the pre-treatment of finished products. However, the phase stable cable application environment is more complex, the cable performance requirements are also higher, in addition to the phase change, the change in attenuation will also affect the performance of the system, so the attenuation stability requirements came into being.

Attenuation is one of the most important parameters of phase stable cable, which reflects the magnitude of the loss of electromagnetic energy when transmitted along the cable. Under the condition that phase shift is not considered, the attenuation constant of the cable consists of two parts: metal attenuation and dielectric attenuation. When the frequency reaches a higher value (generally above GHz), the attenuation of the dielectric has a greater impact, proportional to the frequency, while the attenuation of the conductor has a smaller impact. Therefore, at higher frequencies, the factors affecting cable attenuation are frequency, equivalent dielectric constant and equivalent dielectric loss angle tangent.
                                           

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