A preparation method of a coaxial cable and a microwave absorbing inner sheath of a TTC radar for an aircraft

Abstract

The invention discloses a preparation method of a coaxial cable and a microwave absorbing inner sheath of a TTC radar for an aircraft, comprising a conductor, an insulating layer, an aluminum-plasticcomposite tape shielding layer, an inner braided shielding layer, a braided lubricating layer, an outer braided shielding layer, an inner sheath and an outer sheath arranged in sequence from the inside to the outside; Multi-layer composite is adopted to refine the structure of the cable, and the shielding layer is divided into an inner braided shielding layer, a braided lubricating layer and an outer braided shielding layer according to the prior art, so that the structural performance and the shielding performance of the cable are greatly improved.

Description

technical field [0001] The invention relates to the technical field of coaxial cables, in particular to a measurement and control radar coaxial cable for aircraft. Background technique [0002] At present, the coaxial cable used to maintain and test the radar performance of a certain series of aircraft is an imported Russian cable, which has the following conditions: [0003] 1. The insulation layer is formed by overlapping wrapping PTFE film: because the overlapping rate of the wrapping is 52%-56%, the insulating surface is seriously uneven, which causes the characteristic impedance of the cable to fluctuate greatly, and affects the attenuation performance , greatly reducing the aircraft radar maintenance and detection accuracy. [0004] 2. The braiding layer directly contacts the wrapping insulating layer: During the braiding process, due to the tension of the braided wire during processing, the braided wire squeezes the insulating layer and forms a braiding mark on the w...

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Problems solved by technology

[0003] 1. The insulation layer is formed by overlapping wrapping PTFE film: because the overlapping rate of the wrapping is 52%-56%, the insulating surface is seriously uneven, which causes the characteristic impedance of the cable to fluctuate greatly, and affects the attenuation performance , greatly reducing aircraft radar maintenance and detection accuracy

[0004] 2. The braiding layer directly contacts the wrapping insulating layer: During the braiding process, due to the tension of the braided wire during processing, the braided wire squeezes the insulating layer and forms a braiding mark on the wrapping insulating layer, which affects the cable The characteristic impedance and attenuation performance have caused structural damage; during the repeated use of the cable, due to the external tension and external pressure, the braided wire squeezes the insulating layer and forms a braided mark on the wrapping insulating layer, and with the use time And the frequency increases, the deeper the impression is, the performance of the cable is gradually reduced, and the aircraft radar maintenance and detection accuracy is greatly reduced

[0005] 3. The inner braid is in direct contact with the outer braid: During the repeated use of the cable, due to frequent bending, the inner braid and the outer braid frequently rub against each other, causing the coating of the braid to be worn away, which affects the anti-interference during maintenance and testing performance, which affects the test results

[0006] 4. The sheath is formed by extruding a layer of polyfluoroethylene propylene with a nominal thickness of 0.70mm on the outer braid layer, resulting in a relatively hard cable, which increases the difficulty and time of installation during maintenance and testing, especially during wartime will seriously affect the chances of

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