电容器是各种电子设备中的基本元件，广泛地应用于对电子电路进行旁路、耦合、滤波和调谐等。

Capacitors are essential components of virtually every type of electronic equipment. They are widely used for bypassing, coupling, filtering, and tuning electronic circuits.

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在高频电路中，有时用到电容耦合回路，其调谐特性和频率特性与耦合系数直接相关。

The capacitor coupling circuits are applied in the high frequency circuit. It concern the coupling coefficient that the resonance property and frequency property.

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