用户在结构已经设计完成时，此时如果增加滤波器就会对滤波器结构有特殊的结构尺寸要求。通常滤波器内部电路允许的条件下，用户可以提出任何的滤波器结构尺寸要求。对于端接方式同样也不限于样本中的端接方式，滤波器的端接方式是可以按客户需求确定的。

When the structure has been designed by the user, if the filter is added at this time, there will be special structural size requirements for the filter structure. Generally, if the internal circuit of the filter allows, the user can put forward any filter structure size requirements. The termination method is also not limited to the termination method in the sample. The termination method of the filter can be determined according to customer requirements.

某些用户对滤波器的漏电有严格的要求，常常要求漏电很小甚至近似为零。例如医疗用设备对漏电流就有着极其苛刻的要求。在滤波器内部电路的设计中，漏电流主要由对地电容的容量来决定。因此，定制低漏电流滤波器时，用户只需提供漏电流的限值要求，滤波器设计工程师就会根据需求确定合理的对地电容量，设计出满足客户需求的低漏电滤波器。

Some users have strict requirements for the leakage of the filter, and often require that the leakage is very small or even close to zero. For example, medical equipment has extremely strict requirements for leakage current. In the design of the internal circuit of the filter, the leakage current is mainly determined by the capacity of the capacitance to the ground. Therefore, when customizing the low leakage current filter, the user only needs to provide the limit requirements of the leakage current, and the filter design engineer will determine the reasonable ground power capacity according to the demand, and design the low leakage filter to meet the customer's needs.

一般在用户对滤波器提出高耐压的要求时，滤波器设计工程师就会按需求提高滤波器电容的耐压等级。提高电容的耐压等级会有助于提高整个滤波器的耐压性能。另外，高耐压的需求还会影响滤波器内部元件布局和绝缘强度，因为高耐压会要求滤波器内部具有更大的爬电间距和更强的绝缘性能。

Generally, when users require high voltage withstand of the filter, the filter design engineer will improve the voltage withstand level of the filter capacitor as required. Improving the withstand voltage level of the capacitor will help improve the withstand voltage performance of the whole filter. In addition, the demand for high voltage withstand will also affect the layout of internal components and insulation strength of the filter, because high voltage withstand will require greater creepage distance and stronger insulation performance inside the filter.

耐高温和耐低温的设计主要是选择不同温度气候等级的元件

The design of high temperature and low temperature resistance is mainly to select components with different temperature and climate grades.

实际上用户可以并不关心样本上滤波器的额定电流值，而是直接提出电流需求，滤波器设计工程师则可以很容易地根据需求来选取滤波器电路以及导线的线径和元件参数和散热设计。对于大电流设计，滤波器内部的铜损、铁损和散热条件就比较关键，大电流的需求会不同程度地增加滤波器的体积和成本。

In fact, the user can not care about the rated current of the filter on the sample, but directly put forward the current demand. The filter design engineer can easily select the filter circuit and wire diameter and component parameters and heat dissipation design according to the demand. For the design of large current, the copper loss, iron loss and heat dissipation conditions inside the filter are critical. The demand of large current will increase the volume and cost of the filter to varying degrees.

用户同样可以对滤波器的插损性能提出特殊的需求，一般这种需求是，要求滤波器在某些特殊的频率下达到某个插损值。

Users can also put forward special requirements for the insertion loss performance of the filter. Generally, such requirements require the filter to reach a certain insertion loss value at certain special frequencies.

如果用户需要滤波器同时具有防浪涌、保险、开关等一些其它功能，滤波器设计工程师会在滤波器内增加一些辅助电路，以完成这种特殊需求的定制滤波器。

If the user needs the filter to have some other functions such as anti-surge, insurance, switch, etc., the filter design engineer will add some auxiliary circuits in the filter to complete the customized filter for this special requirement.