What should I pay attention to when testing RF coaxial connectors?

The test method specified in MIL-C-39012 for RF coaxial connectors establishes a corresponding test system. Its testing principle and method are studied in depth, and the system is analyzed in detail for errors. The study shows that the method has high test resolution and measurement accuracy, with a resolution of 0.01 dB in the frequency range of 4~18 GHz. the accuracy is △L=Lx10%+0.01 dB (L is the insertion loss value of the connector under test). In addition, because the system uses a large number of domestic instruments and components, it is conducive to the promotion and use of manufacturers, and provides a practical and reliable test tool for products close to international standards. RF insertion loss is an important technical parameter to measure the electrical performance of connectors, and it is also an indispensable technical index for connectors to approach international standards. With the development of microwave technology and RF coaxial connectors are widely used in the military field. Therefore, people not only require it to have a low voltage standing wave coefficient, but also require it to have a small insertion loss. In the past, due to the lack of effective test methods, insertion loss was not considered as an important index for evaluating the performance of RF coaxial connectors. At present, in order to improve the quality of RF coaxial connectors, close to international standards has become a common goal pursued by various organizations. Therefore, it is imperative to study insertion loss test methods and establish insertion loss test standards. In view of the above reasons, we studied the insertion loss test method stipulated in the U.S. military standard MIL-C-39012 and established the corresponding test system. The results show that the method has the advantages of high resolution, high testing accuracy, less equipment, easy to operate, etc. 2. Definition of RF coaxial connector insertion loss RF coaxial connector can be equivalent to a four-terminal network, the scattering parameters of S11.S1.S2.S21.S222,. Set the reflection coefficients of the equivalent signal source and the equivalent load connected to it to be respectively . Then the insertion loss is defined as the equivalent signal source and the equivalent load approximate matching wave signals are input into the test system through audio signal modulation, and the microwave power signal is linearly converted into an audio voltage signal.

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