What is the principle of thin film capacitor?

Thin film capacitor is a kind of capacitor, and its working principle is to separate two films from each other to form a capacitor. These two films are usually composed of aluminum and sodium tungstate, which act as electrodes and dielectrics respectively. When the charge moves between the two electrodes of the thin film capacitor, a capacitance is formed.

Thin film capacitors have the advantages of high stability, high precision, high frequency and long life, so they are widely used in electronic products and communication equipment.

Thin film capacitors also have the advantages of low loss and low dielectric constant, so they are widely used in high frequency circuits. In addition, thin film capacitors have good thermal stability and withstand voltage performance, which is of great significance to the safety and reliability of high frequency circuits.

According to the working principle, thin film capacitors can also be divided into two categories, namely physical thin film capacitors and chemical thin film capacitors. Physical thin film capacitors are prepared by physical methods, such as hot pressing and hot plating to make resistance layers. Chemical thin film capacitors are prepared by chemical methods such as chemical vapor deposition (CVD) and chemical vapor deposition (PVD).

Thin film capacitors are widely used in electronics, communication, power electronics and other fields because of their characteristics and advantages. For example, thin film capacitors are used in consumer electronic products such as televisions, mobile phones and computers, and also in power electronic products to filter and balance current.

There are also some special applications. Thin film capacitors can also be used in medical devices, aerospace and other fields.

For example, in medical devices, thin film capacitors can be used to detect bio-impedance or bio-electrical signals, which is of great significance to the study of cardiovascular diseases and respiratory diseases.

In the aerospace field, thin film capacitors can be used in high-frequency and high-voltage circuits and microelectronic devices to ensure the safety and reliability of aerospace vehicles.

In a word, thin film capacitors are widely used in electronics, communication, power electronics, medical devices, aerospace and other fields because of their excellent performance characteristics, and have a good performance in meeting various needs.