[magnetic ring inductance] is an electronic component, which is mainly used for electromagnetic induction conversion. A simpler inductance can be a wire, which can be used as an antenna. Converting electric energy into electromagnetic wave is more complicated than the hollow line diagram. It can be used in frequency selection circuit and RF transmitting circuit. Compared with the former two inductors and I-shaped inductors, it can be used for filtering and energy storage. There are also common mode inductors that can resist drying.

[magnetic loop inductance] the chip on PC board is not only an electromagnetic interference object, but also an electromagnetic interference source. In general, we can divide these EMI into two categories: serial mode interference (differential mode interference) and common mode interference (grounding interference). Taking the two PCB wires (wires connecting the components of the main board) on the main board as an example, the so-called serial mode interference refers to the interference between the two wires; The common mode interference is the interference caused by the potential difference between the two wiring lines and the PCB ground wire. The series mode interference current acts between two signal lines, and its conduction direction is consistent with the waveform and signal current; The common mode interference current acts between the signal line and the ground wire. The interference current flows through one-half of the two signal lines in the same direction, and the ground wire is the common loop.