Because EMI filters only protect against conducted EMI, they often pair with shields that block radiated EMI. An unshielded EMI filter can still transmit noise through the air to damage the device. Noise can get emitted from a wire on one side of the EMI filter and then travel to the device by recoupling with the wire on the other side.

Adding a shield at the attachment point of the electromagnetic interference filter can effectively block all forms of EMI. However, if there is only a small length of conductor between the filter and the source of EMI, using a filter alone can be sufficient.

EMI Filter Applications

Military: EMI filters for military applications specifically meet regulations and compliance standards for EMC of military devices. These reliable EMI filters protect against damage to aerospace and military communication systems for secure operations. EMI filters designed for emp protection are also available to protect against EMI threats.

Medical-grade EMI filters: Medical-grade EMI filters meet current requirements for medical applications and protect sensitive medical equipment from damage. EMI filters for MRI rooms are purpose-built to create a secure test chamber free of EMI from lighting, intercoms and other sources of outside noise. Effective and reliable EMI filters for medical applications can be life-saving protection against electromagnetic noise interference.