Ceramic capacitors are also known as ceramic dielectric capacitors or monolithic capacitors. As the name implies, a ceramic dielectric capacitor is a capacitor in which the dielectric material consists of ceramic. Based on the specific ceramic material used, they can be broadly classified into two categories: low-frequency ceramic capacitors and high-frequency ceramic capacitors. In terms of structural form, they can be further categorized into various types, such as disc capacitors, tubular capacitors, rectangular capacitors, chip capacitors, and feed-through capacitors. Furthermore, depending on the method by which the dielectric layer is formed, they can be classified as surface-layer ceramic capacitors or grain-boundary-layer ceramic capacitors.
To enhance the breakdown voltage of ceramic capacitors, a glass glaze coating may be applied to the edges of the interface between the electrodes and the dielectric surface. Talc porcelain, characterized by its high dielectric strength and low dielectric loss at high frequencies, is suitable for the manufacture of high-voltage capacitors. For portable electronic devices, multilayer ceramic chip capacitors (MLCCs) have undergone a continuous trend toward miniaturization; their physical dimensions have shrunk from the 3216 package size to 0603, 0402, and even 0201 types. In certain high-frequency applications, high-frequency MLCC products can serve as substitutes for film capacitors. Among ceramic capacitors, single-layer ceramic dielectric capacitors find application in the field of optical communications, specifically within optical transceiver modules and photoelectric conversion modules. These products are primarily deployed in high-reliability sectors-such as aerospace, aviation, electronic information systems, weaponry, and marine engineering-as well as in high-end civilian sectors, including telecommunications, industrial automation, medical electronics, automotive electronics, and rail transportation systems.