China's high-temperature superconducting filter system to achieve large-scale commercial application

The reporter learned from the appraisal meeting of the high-temperature superconducting filter technology achievements held at Tsinghua University on October 22 that the first batch of products of the high-temperature superconducting filter system independently developed by China and fully independent of intellectual property rights have been ordered and produced and delivered to users. Communication equipment in 16 provinces and municipalities nationwide has been put into practical use for a long time. This is a major breakthrough in the research on the application of high-temperature superconductivity in China, marking that China's high-temperature superconductivity has entered the stage of large-scale commercial application and industrialization in the field of communications. Experts of the appraisal committee highly appraised the project results. The appraisal opinion pointed out that the overall technology of the project reached the international advanced level, which laid a solid technical foundation for the use of high-temperature superconducting technology to improve the anti-band interference performance and electromagnetic compatibility of communication equipment. Communication modernization has made significant contributions.

According to Cao Bisong, the project leader and a professor of the Department of Physics of Tsinghua University, since the discovery of high-temperature superconducting materials in 1986, China has invested a lot of manpower and material resources in applied research and technical research in the past 26 years. Its ultimate goal is to achieve the large Large-scale commercial applications. "This high-temperature superconducting filter system was purchased by end users and put into operation in batches in 16 provinces and municipalities across the country. It is completely different from general research or application for experimental purposes. It signifies that after long-term unremitting research, high temperature in China Superconducting research has evolved from the laboratory research stage to large-scale commercial applications for end users. The real practical application of high-temperature superconducting has become a reality. "

It is understood that in the microwave frequency range, the resistance of high-temperature superconducting materials is 2-3 orders of magnitude lower than that of ordinary metals. The filters made of superconducting thin film materials have low in-band losses, steep band edges, and good out-of-band suppression. They have conventional filters. Unmatched, near-ideal filtering performance. "However, the high-temperature superconducting material must be below its transition temperature Tc to achieve its superconducting zero resistance characteristics, so the research and development of high-temperature superconducting filter system is very difficult. The superconducting filter system that we jointly developed with Zongyi Superconducting Technology Co., Ltd. is It is composed of superconducting filters, low-noise amplifiers operating at minus 200 degrees Celsius, and small refrigerators. It has extremely low noise and excellent frequency selectivity. It can be applied to various wireless communication equipment while greatly improving sensitivity And selectivity, improve anti-interference ability and detection distance, etc. "Cao Bisong said.

In 2005, with the support of national research funding, the project team built a demonstration base for mobile communication application of superconducting filter system in Beijing, and realized long-term application in small batches. In order to realize the large-scale commercial application of the superconducting filter system in China, with the support of relevant national departments and leaders at all levels, the research teams of Tsinghua University and Variety Superconducting Technology Co., Ltd. have worked hard for more than ten years to overcome high performance A series of technical problems such as superconducting filter and low-temperature and low-noise amplifier design and preparation technology, multi-channel superconducting filter performance consistency development technology, environmental adaptability technology to meet the demanding use requirements of equipment and superconducting filter system integration technology, etc. More than 10 invention patents have been authorized by the guide filter technology, and the prototype of the superconducting filter system product was completed in December 2009.

From January to November 2010, under the organization of the national competent authority, 7 professional test units conducted comprehensive performance tests on superconducting filter system products, including electrical performance tests, to meet the high and low temperature, shock, vibration and low Environmental adaptability tests such as air pressure, salt spray, mold, damp heat and other harsh use requirements, performance comparison tests before and after the installation of superconducting filter systems in communication equipment, and long-term trial use by users.

The test results show that all the performance of the superconducting filter system meets or exceeds the technical requirements of the actual application of communication equipment. The performance comparison test before and after installing the superconducting filter system on the communication equipment shows that the superconducting filter system restores the normal operation of the communication equipment that could not work under heavy interference, and increases the maximum operating distance of the equipment under moderate interference compared with the original equipment 56%. Since October 2010, the superconducting filter system has been put into long-term operation on this type of communication equipment, and it has been operating continuously without failure for more than 2 years.

On January 19, 2011, the superconducting filter system passed the technical appraisal organized by the national competent authority and obtained the license for the practical application of communication equipment in China. In August of the same year, Zongyi Superconducting Co., Ltd. won the first batch of five types of superconducting filter system product order contracts, which were promoted and applied in more than 10 provinces and municipalities across the country. Other models of superconducting filter system products will also be put on the market in the next few years.

According to reports, Zongyi Superconducting Technology Co., Ltd. is a high-tech enterprise established in 2006 by Jiangsu Zongyi Co., Ltd. and other shareholders. The company is located in Beijing Zhongguancun Science and Technology Park. At present, Variety Superconductor has built a first-class superconducting filter system production base, and has successfully completed the first batch of high-temperature superconducting filter system mass production and user delivery.

Cao Bisong said that high-temperature superconducting filter technology has broad application prospects in the fields of mobile communications, major scientific engineering and national defense. In order to further promote the application of superconducting filtering technology, it is also necessary to overcome the research difficulties of designing, manufacturing and adapting environmentally-adapted technologies suitable for various application environments, such as the design of superconducting filtering systems that are difficult to meet the requirements of various communication equipment applications.

Experts at the meeting believed that after the efforts of the next few years, this technology will be applied in large-scale applications in more wireless communication fields, and will lead to the formation and development of related industrial chains such as superconducting films, refrigerators, and special microwave components. A brand-new high-temperature superconducting high-tech industry provides a brand-new solution with excellent performance for the upgrading of China's communication technology.

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