Diamond wafer hard core application - satellite mobile phone communication

With the continuous development and progress of society, like other electronics-related fields, electronic information technology requires an increasing amount of data transmission, especially mobile phones, satellite broadcasing and wireless network systems. Among the devices that help meet this demand, high-frequency surface acoustic wave (SAW) equipment is a target.

Compared with traditional diaphragm materials such as carbon fiber film, ceramic film, beryllium film and other materials, they do not have the density of diamond film is small and diamond film sound damping characteristics are better, low specific gravity, high fidelity, excellent high-frequency response characteristics, in addition, diamond film its grain boundary can cause internal loss, compared to other materials, the speaker diaphragm film made of diamond film is better. At the same time, because diamond has a very high modulus of elasticity, can be made into SAW (surface acoustic wave) devices, the use of dielectric materials with high sound velocity is one of the effective ways to increase the working frequency of the device, known material in the fastest propagation of sound speed is diamond (11000 m / s), it can greatly increase the working frequency of SAW, thereby converting radio frequency signals into mechanical vibration, which has a wide range of application prospects in satellite mobile phone communications.

Figure 1 Characteristics of diaphragm materials

Diamond's Young's modulus and sound propagation rate (11,000 m/s) and other characteristics are better than other materials, so diamond film is the most ideal material for satellite mobile phone communication.

Advantages of satellite mobile phones made of diamond film:

1. The fastest sound propagation rate;

2. High modulus of elasticity;

3. Lower mass density;

4. High thermal conductivity, clear and accurate sound positioning;

5. High fidelity;

6. Excellent high-frequency response characteristics;

7. Maximum hardness;

8. Good sound damping characteristics;

CSMH focus on the research and development and production of diamonds, has the ability of MPCVD equipment design, is the first in China to master the core process of MPCVD to prepare high-quality diamond films and achieve mass production, and the original high-efficiency precision processing method for atomic-level surfaces of diamonds based on plasma-assisted polishing, diamond wafer Ra<1nm, diamond hot sink thermal conductivity 1000-2000W/m.k, and GaN on diamond, Diamond on GaN, diamond-based aluminum nitride and other products, the product quality has reached the world-class level. At present, the products are widely used in 5G base stations, lasers, new energy vehicles, new energy photovoltaics, aerospace and national defense and other fields.