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经验告诉我们，在功能设计的同时进行EMC设计，到样板、样机完成则通过EMC测试，是最省时间和最有经济效益的。相反，产品研发阶段不考虑EMC，投产以后发现EMC不合格才进行改进，非但技术上带来很大难度、而且返工必然带来费用和时间的大大浪费，甚至由于涉及到结构设计、PCB设计的缺陷，无法实施改进措施，导致产品不能上市。

Experience tells us that it is the most time saving and economic benefit to carry out EMC design at the same time of functional design and pass EMC test when the sample and prototype are completed. On the contrary, EMC is not taken into account in the product development stage, and improvement is made only after the production of EMC is found to be unqualified. Not only is it technically difficult, but rework will inevitably lead to a great waste of cost and time, and even the product cannot be marketed due to the defects related to structural design and PCB design, so improvement measures cannot be implemented.

规律一、EMC费效比关系规律： EMC问题越早考虑、越早解决，费用越小、效果越好。

在新产品研发阶段就进行EMC设计，比等到产品EMC测试不合格才进行改进，费用可以大大节省，效率可以大大提高;反之，效率就会大大降低，费用就会大大增加。

1. Law of EMC cost-effectiveness ratio: The earlier an EMC problem is considered and solved, the lower the cost and the better the effect.

Conducting EMC design in the development stage of new products can greatly save costs and improve efficiency, compared with waiting for product EMC test unqualified. On the contrary, the efficiency will be greatly reduced and the cost will be greatly increased.

规律二、高频电流环路面积S越大, EMI辐射越严重。

高频信号电流流经电感最小路径。当频率较高时，一般走线电抗大于电阻，连线对高频信号就是电感，串联电感引起辐射。电磁辐射大多是EUT被测设备上的高频电流环路产生的，最恶劣的情况就是开路之天线形式。对应处理方法就是减少、减短连线，减小高频电流回路面积，尽量消除任何非正常工作需要的天线，如不连续的布线或有天线效应之元器件过长的插脚。减少辐射骚扰或提高射频辐射抗干扰能力的最重要任务之一，就是想方设法减小高频电流环路面积S。

Rule 2. The larger the area of high-frequency current loop S is, the more serious the EMI radiation will be.

High frequency signal current flows through the minimum path of inductance. When the frequency is high, the reactance of the line is generally greater than the resistance, and the connection to the high frequency signal is the inductance, and the series inductance causes the radiation. Most of the electromagnetic radiation is generated by high-frequency current loops on the EUT equipment under test, the worst of which is the open-circuit antenna form. The corresponding treatment method is to reduce or shorten the connection, reduce the area of high-frequency current loop, as far as possible to eliminate any abnormal work needs of the antenna, such as discontinuous wiring or antenna effect of the components too long pins. One of the most important tasks to reduce radiation disturbance or improve the anti-interference ability of rf radiation is to find ways to reduce the area of high-frequency current loop S.

规律三、环路电流频率f越高，引起的EMI辐射越严重，电磁辐射场强随电流频率f的平方成正比增大。

减少辐射骚扰或提高射频辐射抗干扰能力的最重要途径之二，就是想方设法减小骚扰源高频电流频率f，即减小骚扰电磁波的频率。

Rule 3: The higher the loop current frequency F is, the more serious the EMI radiation will be. The electromagnetic radiation field intensity increases in direct proportion to the square of current frequency F.

Two of the most important ways to reduce radiation disturbance or improve the anti-interference ability of rf radiation is to try every means to reduce the high-frequency current frequency f of the disturbance source, that is, to reduce the frequency of the disturbance electromagnetic wave.