Identifying EMC Interference Sources of a Microwave Transmission Module in Order to Locate Them

摘要

In the design of power microwave transmitter modules, many signals of different types coexist in a small space. It is possible that module dysfunctions occur due to the presence of electromagnetic disturbance type. It's the reason why it is important to understand and quantify these disturbances and in what form they spread in the structure. To do this we have studied a microwave simplified demonstrator placed in a shielded box by reducing the complex electromagnetic study of the complete transmission module taking into account a maximum of electromagnetic effects with and without shield. The electromagnetic (EMC) measurements of the demonstrator were conducted in a GTEM cell to isolate the demonstrator from all external interference and to compare to the 3D electromagnetic simulations, allowing to locate parts of the sensitive circuit to disturbances and to determine the sources of disturbances of the module. The simulation of the demonstrator using electromagnetic simulator allowed us to obtain a real internal electromagnetic mapping of the demonstrator. This mapping was used to characterize the electromagnetic behavior of the overall structure issue and identify sources of disturbance. This study should be complemented by measurements to scan the surface of the circuit using appropriate probes and serve to validate the method.