EMC Coupling Decoupling Networks

Coupling Decoupling Networks (CDNs) are devices that allow for the injection of disturbances on associated EUT/DUT cabling and subsequently removing it prior to auxiliary equipment. They serve the purpose of transferring energy or disturbances (coupling) and also removing energy or EMI/noise (decoupling). These are commonly used during EMC immunity testing as a method of injecting noise which the EUT/DUT will be exposed to, then subsequently removing unwanted interference. The design and capabilities of each network will differ depending upon the application, associated equipment, and underlying standard. The two main advantages of CDNs are: Low uncertainty of applied EMI/stress and Decoupling of the auxiliary equipment (AE). There are a variety of different applications where these type of devices are used, the two most common being conducted RF (continuous) and transient immunity tests. Both types of EMI tests are commonly conducted on a variety of different power and data (signal) lines requiring the use of CDNs during testing.