电解电容和薄膜电容不能笼统的说哪个比较好，这个要在一定的使用条件下才能判断选择用哪种类型的电容更合适。在特定的条件下，各有各的优点，在实际电路中，只要能正确做出选型就可以了。

　　Electrolytic capacitor and film capacitor can not be generally said which is better, this must be in certain conditions of use to determine which type of capacitor is more appropriate. In the specific conditions, each has its own advantages. In the actual circuit, as long as you can correctly make the type selection.

　　根据薄膜电容本身的特点，绝缘阻抗很高，频率特性优异，频率响应宽广，而且介质损失很小。但什么是频率特性？让我们一起来了解一下。

　　According to the characteristics of thin film capacitor, it has high insulation impedance, excellent frequency characteristics, wide frequency response and small dielectric loss. But what is frequency characteristic? Let's take a look at it.

　　1.频率增大，薄膜电容与电解电容的空值变化。

　　With the increase of frequency, the null values of film capacitance and electrolytic capacitor change.

　　电解电容的容量随着频率增加逐渐减少，而薄膜电容器则基本不变。这也是我们为什么说薄膜电容的频率响应范围宽的核心原因。

　　The capacity of electrolytic capacitor decreases gradually with the increase of frequency, while the capacity of thin film capacitor remains unchanged. This is the core reason why we say that the frequency response range of thin film capacitor is wide.

　　2. 频率增大，薄膜电容与电解电容的损耗变化。

　　With the increase of frequency, the loss of film capacitor and electrolytic capacitor changes.

　　通过实验室的对比，得出来的结果是：随着频率的增加电解电容器的损耗急剧加大，但薄膜电容器的容量仅有微小变化。

　　Through the laboratory comparison, the result is: with the increase of frequency, the loss of electrolytic capacitor increases sharply, but the capacity of thin film capacitor only changes slightly.

　　实测数据对比：

　　Comparison of measured data:

　　1.2uF 薄膜电容1.2uf film capacitor

　　结论：薄膜电容频率特性非常的好，介质损耗非常的小。

　　Conclusion: the frequency characteristic of the film capacitor is very good, and the dielectric loss is very small.

　　100uF/35V 电解电容100uF / 35V electrolytic capacitor

　　结论：电解电容的频率特性是很差的，10KHz时容量基本就跌没了。到了100KHz 甚至于就相当于个电感了。介质损耗也很大，Q值都没有超过2。

　　Conclusion: the frequency characteristic of electrolytic capacitor is very poor, and the capacity basically drops at 10kHz. At 100kHz, it is equivalent to an inductance. The dielectric loss is also very large, Q value does not exceed 2.