SMD inductor packaging can be divided into shielded and unshielded types. Flat, I-shaped packages are generally unshielded, while square fully enclosed packages are considered shielded.

Shielded chip inductors have a different effect from ordinary chip inductors. Generally, chip inductors are not shielded in circuits and cannot achieve the desired effect when used in circuits. Shielded chip inductors can shield some of the current instability in the circuit, effectively blocking it. The complete metal shield of the shielded inductor surrounds the positively charged conductor

On the inner side of the shielding body, an equal amount of negative charge will be induced as the charged conductor, and on the outer side, an equal amount of positive charge will appear as the charged conductor. If the metal shielding body is grounded, the positive charge on the outer side will flow into the ground, and there will be no electric field on the outer side, that is, the electric field with the positive conductor will be shielded within the metal shielding body.

Shielded inductors also play a coupling role in the circuit. To reduce the coupling interference voltage of alternating electric fields on sensitive circuits, shielded patch inductors can set a metal shield with good conductivity between the interference source and the sensitive circuit, and ground the metal shield. The coupling interference voltage of alternating electric field on sensitive circuits depends on the voltage of alternating electric field, coupling capacitance, and

The product of the grounding resistance of the metal shield. As long as we try to make the metal shield well grounded, we can make the coupling interference voltage of the alternating electric field on the sensitive circuit very small. Electric field shielding is mainly based on reflection, so the thickness of the shielding body does not need to be too large, and structural strength is the main consideration factor.