For example, when using a 18GHz test cable in a 40GHz microwave test system, the system is unbalanced. So Xiaotian will talk about how to choose a suitable RF cable assembly from the perspective of the performance of the cable itself.

1) In a microwave measurement system claiming to be 40GHz (such as a 40GHz signal source, a spectrum analyzer, etc.), if only 26.5GHz test cable assemblies and adapters are found, the system is unbalanced ;

2) When the highest frequency of the DUT (DUT) is 6GHz, a 40GHz spectrum analyzer and a 6GHz test cable assembly are used, then the current test system is balanced;

3) Regardless of the system, if the test cable is faulty, even if it is a soft fault, such as a random bad connection between the connector and the root of the cable, in this case, as the cable shakes or moves, the frequency spectrum The amplitude readings on the analyzer will change as the tester has not noticed a problem with the cable, so obviously the system is also unbalanced.