Rule 1. The larger the high-frequency current loop area S, the more serious the EMI radiation.

  High-frequency signal current flows through the path of least inductance. When the frequency is high, the line reactance is generally greater than the resistance, and the line is inductance for high-frequency signals, and the series inductance causes radiation.

   Law Two, EMC cost-effectiveness ratio relationship law: The earlier the EMC problem is considered and resolved, the smaller the cost, the better the effect.

  In the new product development stage, EMC design is carried out. Compared with waiting until the EMC test of the product is unqualified, the cost can be greatly saved and the efficiency can be greatly improved. On the contrary, the efficiency will be greatly reduced, and the cost will be greatly increased.

   Law 3. The higher the loop current frequency f, the more serious the EMI radiation caused, and the electromagnetic radiation field strength increases in proportion to the square of the current frequency f.

  The second most important way to reduce radiation disturbance or improve the anti-interference ability of radio frequency radiation is to find ways to reduce the frequency f of the high-frequency current of the disturbance source, that is, to reduce the frequency of the disturbance electromagnetic wave.

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