Surface acoustic waves form a complete system
Surface acoustic wave devices are a popular product in the field of electronic ceramics. Surface acoustic wave (SAW) is a kind of elastic wave propagating along the surface of objects. The development of Surface acoustic wave (SAW) technology in China began in 1970, and after 37 years of research and development, it has basically formed a complete system from theoretical research, crystal material growth and processing, device design and production, and system application.
The development of surface acoustic wave (SAW) technology in China can be roughly divided into three stages: ** stage, the application of SAW technology in the military field development and application. The first impetus for the development of surface acoustic wave technology comes from the field of national defense and military, and China is no exception. Radar, communication, navigation and electronic countermeasures all use a variety of SAW signal processing devices. In the second stage, the acoustic meter wave technology is applied to the field of radio and television. In the third stage, surface acoustic wave technology is applied to modern communication.
Surface acoustic wave in our country has experienced 30 years of development, have sprung up to more than 30 large and small manufacturing enterprises, while the manufacturer is numerous, but the technical level and the scale of production is limited, in addition to the CLP institute of science and technology, 26 to 55, Germany tsinghua jade-like stone electronics co., LTD., wuxi good da electronics co., LTD. In production technologies, such as size and types of products have certain advantages, The remaining small scale, mainly to the production of TV if filter, resonator and intercom filter technology requirements are relatively low products, low product price.
In terms of product packaging, THE TV MEDIUM frequency surface acoustic wave filter has developed from metal packaging to plastic case packaging. Because plastic case packaging has the characteristics of small volume and light weight, especially in the integrated high frequency head can reflect its advantages, many domestic manufacturers have developed their own plastic sealing products. In terms of scale, Wuxi Haoda Electronics Co., Ltd. and China Electric Technology De Qinghua Ying Electronics Co., Ltd. in plastic sealing products occupy a larger market share.
At present, the minimum size of SMD products can be mass produced in China is 3mm×3mm. The main production units are 55 institute of China Electric Technology, Deqinghua Ying, 26 Institute and Wuxi Haoda Electronics Co., LTD. At present, the mainstream product packaging of RF filter adopts the reverse welding technology below 2.5mm×2.0mm. Therefore, the production of SAWRF filter in China is greatly limited. Due to cost, technology and other factors, several domestic powerful research institutes and production enterprises have not planned to further invest in reducing product packaging. Nanyang Jinguan Group has invested in part of the inverted welding equipment, but is not yet capable of production.
At present, the basic research of China’s surface acoustic wave products, especially the low loss design technology, is mainly based on the 26th Research institute of China Electronics Technology, Nanjing University and the Institute of Acoustics of the Chinese Academy of Sciences. In addition, China Electronics Technology De Qinghua Ying, Institute 55 and Wuxi Haoda and other units also have certain product development capabilities.
China’s surface acoustic wave industry compared with foreign countries, there is a large gap. Product research and development does not have too many scientific research institutions and colleges and universities as technical support, the lack of a basic research team, due to the factors of market competition, each unit acting independently, lack of academic exchanges, many small businesses do not have research and development ability. In terms of production technology and production scale, there is still a big gap between some international companies such as EPCOS, Murata, Fujistu, SANYO, etc., including packaging technology, degree of automation, process level, production scale, etc.
With the market competition intensified, the current profits of the entire sound meter industry are generally not high, the largest market mobile phone RF filter has been maintained at the level of production, lost investment opportunities. In order to have a certain survival status in the industry in the future, we must continuously improve the product yield, reduce production costs, improve product quality and enhance the scale production capacity through our own technological progress. We believe that China’s surface acoustic wave industry in the future development, can do the following aspects: **, strengthen mutual cooperation and resource integration within the industry. Second, expand international technical cooperation. Third, actively explore new application areas. In addition to the current conventional applications, surface acoustic wave technology also has some special applications in sensors, radio frequency equipment (RFID) and other aspects