EMI filter connectors use multi-layer ceramic capacitor arrays together with inductive materials to realize robust, high performance low pass filter networks. Where required, protection can be provided against high energy transients from direct lightning strikes, standard EMP, high altitude EMP (HEMP), non-nuclear EMP (NNEMP) and electromagnetic interferences (EMI).
Electromagnetic Interference (EMI) is broadly defined as any unwanted electrical or electromagnetic energy that causes undesirable responses, degraded performance, or failure in electronic equipment. EMI is broadly categorized as narrowband EMI (ex: GSM phone interference) and broadband EMI (ex: high voltage power lines). In order to protect modern electronic systems from the abundance of EMI sources in today’s environments, a combination of approaches are implemented: shielding, filtering, and reduction of EMI at the source (if possible).
The easiest and most common method of protecting electronics involves encapsulating the device in a faraday cage (enclosure of conducting material). This allows for the device to be protected from outside EMI as well as containing EMI generated from the device from interfacing with other electronic devices. The problem with using this approach exclusively is that most electronic systems require signal and power lines. Inserting these through the faraday cage would provide a path for the EMI to leak through. This issue is resolved through the use of a filter connector that contains EMI on each side of the faraday cage.