Method and assembly for improving mechanical phase stability of flexible microwave coaxial cable

Abstract

The invention provides a flexible microwave coaxial cable mechanical phase stability improving method which applies pre-tensioning force at two ends of coaxial cables. The invention also discloses a flexible microwave coaxial cable assembly. The flexible microwave coaxial cable assembly comprises the coaxial cables and a protection sleeve which covers the coaxial cable outer layer, wherein pre-tensioning force adjusting mechanisms are arranged on welding structures at two ends of the coaxial cables. The flexible microwave coaxial cable mechanical phase stability improving method and assembly has the advantages of obviously reducing influences to transmission phase from testing cable assembly mechanical bending, enabling the pre-tensioning force of the coaxial cables to be consistent and accordingly eliminating mechanical phase stability difference caused by the material characteristic difference of the coaxial cables and the protection sleeve and the length machining difference; obviously improving the phase stability of the testing cable assembly mechanical bending; being applicable to microwave flexible cable assemblies having requirements for a mechanical stationary phase characteristic except for a testing cable assembly.

Description

technical field [0001] The invention relates to a method and an assembly for improving the mechanical phase stability of a flexible microwave coaxial cable. Background technique [0002] In the field of microwave communication and testing, flexible microwave coaxial cable assemblies are mainly used for the transmission of microwave signals between communication and testing systems. One of its typical applications is the measurement and analysis of power loss, gain and phase characteristics of microwave components. This kind of measurement and analysis is generally accomplished by a vector network analyzer (referred to as vector network) and a high-performance stable amplitude and phase microwave coaxial test cable assembly (referred to as a test cable assembly). Among them, the test cable assembly is used to connect the VNA test port and the input and output ports of the device under test, and is a flexible transmission channel for microwave signals (such as figure 1 ). D...

AI Technical Summary

Problems solved by technology

These will lead to changes in transmission characteristics

Therefore, in the testing process of the existing test cable assemblies, the transmission phase will still change to a certain extent with the bending of the cable, and the mechanical phase stability still cannot meet the high-precision test requirements.

In addition, due to the existence of material property errors and length processing errors of coaxial cables and sheaths, the initial stress states of the cables and sheath materials after assembly of the test cable assemblies are different, so the mechanical phase stability of each test cable assembly is different. Larger, lower pass rate

Generally, the screening method is used for production, the cost is high and the efficiency is low, even if the mechanical phase stability performance index of qualified products is relatively large.

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