Oil cylinder manufacturer Characteristics of middle coil: coil usually refers to the wire winding in a ring shape. Common coil applications include: motor, inductance, transformer, ring antenna, etc. The coil in the circuit refers to the inductor. The guide wire is wound one by one, and the wires are insulated from each other. The insulation pipe can be hollow, or it can contain iron core or magnetic particle core, referred to as inductance. Inductance can also be divided into fixed inductance and variable inductance. The fixed inductance coil is called inductance or coil for short. Expressed in L, the unit is Henry (H), millihenry (mH), millihenry (uH), 1H=10 ^ 3mH=10 ^ 6uH.

The capacitance between turns of the coil, between the coil and the shield, and between the coil and the substrate is called distributed capacitance. The existence of distributed capacitance reduces the Q value of the coil and makes the stability worse. Therefore, the smaller the distributed capacitance of the coil, the better.