Ceramic filters are made of lead zirconate titanate ceramic material. This ceramic material is made into sheets and coated with silver on both sides as electrodes. After DC high-voltage polarization, it has a piezoelectric effect. It plays a filtering role and has the characteristics of stability and good anti-interference performance. It is widely used as a frequency selection component in various electronic products such as 5G, TVs, video recorders, and radios. It has the advantages of stable performance, no need for adjustment, and low price, replacing the traditional LC filter network.

Plastic filters may be used on low-end products in the future, and small metal cavity filters will be used to compensate for the 5G low-frequency band close to the 4G frequency band, occupying a small market. Compared with small metal cavity filters, ceramic filters have higher Q values, lower insertion loss, and high dielectric constants, which make the filter smaller and lighter. At the same time, the price of ceramic powder raw materials is low, and the cost is lower than that of metal filters. Therefore, ceramic filters will occupy the main market of 5G filters in the future.