In today’s highly electronic world, Electromagnetic Interference (EMI) has become an invisible threat that compromises the performance and reliability of equipment. From precision medical devices and critical automotive electronic systems to the smartphones we use daily, all can fall victim to EMI. To effectively address this challenge, it is essential to first understand its two primary forms of transmission: Conducted EMI and Radiated EMI.
- Conducted EMI: Noise Traveling Along a “Path”
Conducted EMI refers to noise energy that propagates along physical conductors, such as power cords, signal lines, or common ground wires. It can be likened to “contaminated water” flowing through a “pipe,” directly invading the interior of equipment via established pathways.
Main Sources: High-frequency noise generated by devices like switching power supplies, motor drives, and frequency converters can feedback into the power grid.
Potential Impact: Degrades the performance of other devices on the same circuit or shared power grid, causes data errors, or even leads to operational failure.
- Radiated EMI: Boundless Field Interference
Radiated EMI, on the other hand, propagates freely through the air in the form of electromagnetic waves, without the need for any physical conductors. It is more like “noise” permeating the air, capable of penetrating equipment enclosures.
Main Sources: High-frequency circuits, wireless transceivers, clock signals, and even inadequate shielding designs in the devices themselves.
Potential Impact: Interferes with nearby sensitive devices, leading to issues such as snow on displays, disruptions in wireless communication, or loss of navigation system signals.
Whether the noise arrives via conduction through wires or radiation through the air, the ultimate consequences are equally severe. Both Conducted EMI and Radiated EMI can cause damage, performance degradation, temporary malfunctions, or systemic functional interruptions, severely affecting the stability and lifespan of electronic devices.
Facing the dual challenges of EMI, choosing efficient Electromagnetic Compatibility (EMC) solutions is crucial. Leveraging its core dry-pressing technology, LCA develops products such as feedthrough capacitor filters and array filters, which precisely target the transmission characteristics of Conducted EMI and Radiated EMI. These solutions suppress the conduction and radiation of interference signals at the source, building a reliable “electromagnetic shield” for equipment and ensuring stable operation in complex electromagnetic environments.
