A flat inductor (Flat Inductor) is a type of inductor that has a relatively small thickness, and it is commonly used in high-frequency circuits. An inductor is a passive electronic component that can store magnetic field energy and has the ability to resist changes in alternating current. In a circuit, an inductor can be used to filter signals, suppress noise, and provide resonant circuits, among other applications. Compared to other types of inductors, flat inductors have lower parasitic capacitance and higher Q values (quality factor), thus offering better performance in high-frequency applications.