On June 29, 2019 (May 27, 2019 in the lunar calendar), Sun Zhongliang, academician of China Academy of Engineering and outstanding expert in the field of millimeter wave technology, passed away. On June 29, 2019, Mr. Sun Zhongliang, an outstanding expert and educator in the field of millimeter wave technology in my country, academician of China Academy of Engineering and professor of Southeast University, passed away due to ineffective medical treatment. His research during his lifetime helped the development of 5G in my country! According to reporters 'statistics, since the beginning of this year, my country has bid farewell to 15 academicians of the two academies, and 4 academicians passed away in June alone. The famous millimeter-wave technology expert passed away. On June 29, the official website of the School of Information Science and Engineering of Southeast University issued an obituary. He was an outstanding expert and educator in the field of millimeter-wave technology in my country, a model worker in the national education system, and an advanced worker in science and technology in universities across the country. Mr. Sun Zhongliang, member of the 10th National Committee of the Chinese People's Political Consultative Conference, academician of the China Academy of Engineering, and professor of Southeast University, died in Nanjing at 3:24 on June 29, 2019 due to ineffective medical treatment. He was 83. Sun Zhongliang's reporter learned from the official website of the Personnel Department of Southeast University that Sun Zhongliang was born in Shanghai City on August 26, 1936, and was originally born in Yin County, Zhejiang Province. In 1960, he graduated from the Department of Radio Engineering of Nanjing Institute of Technology (now Southeast University) and stayed there to teach. He has been engaged in teaching and scientific research for many years. Since 1993, he has served as the director of the State Key Laboratory of Millimeter Wave, the head of the discipline of electromagnetic field theory and microwave technology, and a member of the 8th, 9th and 10th National Committees of the Chinese People's Political Consultative Conference. In November 2001, he was elected as an academician of China Academy of Engineering. It is reported that Academician Sun Zhongliang is a well-known expert in the field of millimeter wave technology. He has solved a series of problems in the field of millimeter wave and made outstanding contributions to the engineering application and national defense application of millimeter wave technology in my country. In recent years, he has focused on research on new submillimeter wave technologies. He has served as the chief scientist of the National Defense 973 Project, a part-time member of the General Assembly Science and Technology Committee, and an expert of an expert group of the General Assembly. He has won the first prize of the National Scientific and Technological Progress Award, and the first and second prizes of provincial ministries and commissions for scientific and technological progress in a total of six. The reporter learned that the millimeter wave frequency is 30GHz to 300GHz, and the corresponding wavelengths are 10mm to 1mm respectively. In the field of mobile communications, 24GHz-100GHz is often referred to as 5G millimeter wave. The research on millimeter wave technology is of great significance to the fifth generation mobile communication technology. This year, my country has bid farewell to 15 academicians, Academician Sun Zhongliang. The Funeral Committee said that Academician Sun Zhongliang has dedicated his life to my country's education, scientific research and talent training. He has taught and educated people for sixty years, has been full of peaches and plums all over the world, and has been deeply loved by teachers and students. The country has cultivated a large number of outstanding scientific and technological talents. He has won honors such as "Honorary Medal of Dedication to National Defense Science","National Level Young and Middle-aged Expert with Outstanding Contributions","National Advanced Science and Technology Worker in Universities", and "National Model Worker in the Education System". According to statistics from the reporter, since 2019, a total of 15 academicians of the two academies have passed away in my country, of which 7 are academicians of the China Academy of Sciences and 8 are academicians of the China Academy of Engineering. Among the 15 academicians who passed away, 2 were women, and 6 were over 90 years old. The seven academicians of China Academy of Sciences who passed away this year are: Yu Min (aged 93), winner of the "Two Bombs and One Satellite" Meritorious Medal who died on January 16, Liang Jingkui, a famous physical chemist who died on January 19 (aged 88), Jin Guozhang, a researcher at the Shanghai Institute of Medicine, who died on January 29, Wang Yening (female, aged 93), a condensed matter physicist who died on February 22, Shen Ziyin, a nationally renowned Chinese doctor who died on March 7 (aged 91), Tang Dingyuan, a famous solid-state physicist, died on June 3 (aged 99), and Kong Xiangfu, a famous medical scientist, died on June 17 (aged 77). The eight academicians of China Academy of Engineering who passed away this year are: Tu Mingjing, a metal materials expert (aged 91), who died on January 1, Gao Changqing, a cardiovascular surgery expert (aged 59), who died on January 8, Ruan Xueyu, a pressure processing expert (aged 86), who died on February 3, Sun Wei (female, aged 84), a civil engineering materials expert who died on February 22, Rong Baisheng, a building structure expert (aged 89), who died on May 11, Li Hengde, a materials science expert who died on May 28 (aged 98), Ning Bin, a control system engineering expert who died on June 14 (aged 60), and Sun Zhongliang, a millimeter wave technology expert who died on June 29 (aged 83).