1. Chip inductor: Inductive components and EMI filter components are widely used in PCB circuits of electronic devices. These components include chip inductors and chip magnetic beads. The following describes the characteristics of these two devices and analyzes their common and special applications. The benefits of surface mount components lie in their small packaging size and the ability to meet actual space requirements. Except for differences in impedance value, current carrying capacity, and other similar physical characteristics, the other performance characteristics of through hole connectors and surface mount devices are basically the same. In situations where chip inductors are required, they are required to achieve two basic functions: circuit resonance and choke reactance. Resonant circuits include resonance generation circuits, oscillation circuits, clock circuits, pulse circuits, waveform generation circuits, and so on. The resonant circuit also includes a high Q bandpass filter circuit. To generate resonance in a circuit, both capacitance and inductance must exist in the circuit. There is a parasitic capacitance at both ends of the inductor, which is caused by the ferrite body between the two electrodes of the device acting as a capacitive medium. In a resonant circuit, the inductance must have a high Q, narrow inductance deviation, and stable temperature coefficient in order to meet the requirements of narrow band and low frequency temperature drift in the resonant circuit. High Q circuits have sharp resonant peaks. Narrow inductance bias ensures that the resonance frequency deviation is minimized as much as possible. A stable temperature coefficient ensures that the resonant frequency has stable temperature variation characteristics. The difference between standard radial lead out inductors, axial lead out inductors, and chip inductors is only due to differences in packaging. Inductive structures include coils wound on dielectric materials (usually alumina ceramic materials), hollow coils, and coils wound on ferromagnetic materials. In power applications, when used as a choke, the main parameters of inductance are DC resistance (DCR), rated current, and low Q value. When used as a filter, a wide bandwidth characteristic is desired, therefore, the high Q characteristic of the inductor is not required. A low DCR can ensure the minimum voltage drop, and DCR is defined as the DC resistance of a component in the absence of an AC signal.

2. Chip magnetic beads: The main function of chip magnetic beads is to eliminate RF noise present in transmission line structures (PCB circuits). RF energy is the AC sine wave component superimposed on the DC transmission level, and the DC component is the useful signal required. However, RF energy is useless electromagnetic interference transmitted and radiated along the line (EMI). To eliminate these unnecessary signal energy, chip magnetic beads are used to act as high-frequency resistors (attenuators), which allow DC signals to pass through while filtering out AC signals. Usually, high-frequency signals are above 30MHz, however, low-frequency signals are also affected by chip magnetic beads