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From Terahertz Imaging to Terahertz Wireless Communications Review
Yi Huang,Yaochun Shen,Jiayou Wang
Engineering 2023, Volume 22, Issue 3, Pages 106-124 doi: 10.1016/j.eng.2022.06.023
Terahertz (THz) technology is probably best known to the public as a powerful tool for imaging, since it has been applied in security and medical scanning, resulting in numerous impressive images that would be unobtainable using other technologies. With the roll-out of 5G mobile networks, research into 6G wireless communications is heating up. It is envisioned that THz technology will be used for 6G and future wireless communications. In this paper, we review how THz technology has been employed for imaging and wireless communications, identify state-of-the-art developments in the field, and then examine and compare common devices and issues in both applications. The possibility of integrating THz imaging/sensing and wireless communications is considered, and challenges and future perspectives are presented and discussed. It is shown that THz technology is indeed a key enabling technology for both imaging and wireless communications in the future.
Keywords: Communications Imaging Terahertz technology Wireless communications
A mechanical reliability study of 3-dB waveguide hybrid couplers in submillimeter and terahertz bands Research Articles
Zhongqian Niu, Bo Zhang, Daotong Li, Dongfeng Ji, Yang Liu, Yinian Feng, Tianchi Zhou, Yaohui Zhang, Yong Fan,zhangbouestc@yeah.net
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 8, Pages 1104-1113 doi: 10.1631/FITEE.2000229
Keywords: 定向耦合器;3-dB分支波导定向耦合器;亚毫米波器件;太赫兹电路;机械可靠性
A high-precision terahertz retrodirective antenna array with navigation signal at a different frequency Correspondence
Zhong-bo ZHU, Wei-dong HU, Tao QIN, Sheng LI, Xiao-jun LI, Jiang-jie ZENG, Xian-qi LIN, Leo P. LIGTHART
Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 3, Pages 377-383 doi: 10.1631/FITEE.1900581
Keywords: Terahertz Retrodirective antenna array Terahertz communications Conjugate mixing
Graphene-metasurface for wide-incident-angle terahertz absorption Research
Ri-hui Xiong, Xiao-qing Peng, Jiu-sheng Li,lijsh2008@126.com
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 3, Pages 287-436 doi: 10.1631/FITEE.2000079
Keywords: 石墨烯超表面;太赫兹吸收器;欧米伽形石墨烯图案
Frequency–angle two-dimensional reflection coefficient modeling based on terahertz channel measurement Correspondence
Zhaowei CHANG, Jianhua ZHANG, Pan TANG, Lei TIAN, Li YU, Guangyi LIU, Liang XIA,changzw12345@bupt.edu.cn,jhzhang@bupt.edu.cn
Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 4, Pages 626-632 doi: 10.1631/FITEE.2200290
Keywords: 太赫兹通信;反射系数建模;入射角;建筑材料;菲涅耳模型
Terahertz time-domain spectroscopy and micro-cavity components for probing samples: a review Special Feature on Precision Measurement and Instr
Lin CHEN, Deng-gao LIAO, Xu-guang GUO, Jia-yu ZHAO, Yi-ming ZHU, Song-lin ZHUANG
Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 5, Pages 591-607 doi: 10.1631/FITEE.1800633
We give a brief review of the developments in terahertz time-domain spectroscopy (THz-TDS) systems and microcavity components for probing samples in the University of Shanghai for Science and Technology. The broadband terahertz (THz) radiation sources based on GaAs m-i-n diodes have been investigated by applying high electric fields. Then, the free space THz-TDS and fiber-coupled THz-TDS systems produced in our lab and their applications in drug/cancer detection are introduced in detail. To further improve the signal-to-noise ratio (SNR) and enhance sensitivity, we introduce three general micro-cavity approaches to achieve tiny-volume sample detection, summarizing our previous results about their characteristics, performance, and potential applications.
Keywords: Terahertz (THz) time-domain spectroscopy Micro-cavity Metal holes array Waveguide cavities Spoof localized surface plasmons (LSPs)
Development Strategy of Free Electron Laser Technology in China
Li Peng, Li Ming, Wu Dai, Zhou Zheng, Tang Chun
Strategic Study of CAE 2020, Volume 22, Issue 3, Pages 35-41 doi: 10.15302/J-SSCAE-2020.03.006
Free electron laser (FEL) is a large-scale scientific research device based on electron linear accelerator and has been widely used in basic scientific research such as condensed matter physics, advanced materials and surface physics, atomic and molecular physics, chemistry, and biology. The advancement of FEL technology will promote the light sources to develop towards higher power and shorter wavelength to satisfy the increasing demands of users. This study introduces the necessity of development based on the characteristics of the FEL technology and summarizes the current development status of the technology in China and abroad. It also analyzes the existing problems in its development in China and proposes ideas and goals for the development of FEL technology in China. By 2035, China should focus on making breakthroughs in long-wave FEL, X-ray FEL, new FEL, and FEL-based extreme ultraviolet (EUV) lithography light source technologies. Based on the research and analysis, this study proposes some suggestions for the steady and healthy development of the FEL technology in China, including making scientific development strategies, raising investment in fundamental research to promote independent innovation, strengthening multi-party cooperation to promote the transformation of scientific and technological achievements, promoting market application, and strengthening personnel training.
Keywords: free electron laser infrared-terabertz FEL extreme ultraviolet-FEL X-ray FEL
Channelmeasurements and models for 6G: current status and future outlook Review Articles
Jian-hua ZHANG, Pan TANG, Li YU, Tao JIANG, Lei TIAN
Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 1, Pages 39-61 doi: 10.1631/FITEE.1900450
Keywords: Channel measurements Channel models Sixth generation Terahertz Industrial Internet of Things Space-air-ground integrated network Machine learning
Standardization of 6G Key Technologies: Thoughts and Suggestions
Luo Yan, Quan Wei, Zhang Hongke
Strategic Study of CAE 2023, Volume 25, Issue 6, Pages 18-26 doi: 10.15302/J-SSCAE-2023.06.003
Research on the sixth-generation mobile communication (6G) technology starts gradually after the commercialization of the fifth-generation mobile communication (5G) technology, thus to support the development of digital economy and the construction of digital infrastructure. Countries worldwide are now competing for the establishment of 6G standards. This study reviews the development status of 6G standards from the aspects of 6G technology development in major developed countries and regions, international cooperation in 6G standards development, and 6G technology development in China. Moreover, it explores the integrated application and standardization progresses of 6G technology, involving the standardization of computing power networks, blockchain, digital twins, artificial intelligence, and holographic communications. China can make plans in advance for the standardization of 6G key technologies, focusing on terahertz, smart metasurface, smart holographic radio, super-large-scale MIMO, and communicationsperception integration technologies. Furthermore, the following suggestions are proposed: (1) strengthening the independent innovation of 6G key technologies to promote the independent development of 6G basic industries; (2) accelerating cross-industry cooperation and innovation to establish the standards system for 6G key technologies; and (3) deepening international cooperation on 6G technologies to help create an open and win-win global industrial ecology.
Keywords: 6G standards establishment terahertz computing power network communications and perception integration
Novel X-ray and Optical Diagnostics for Studying Energetic Materials: A Review Review
Yiyang Zhang, Sen Chen, Yang Cai, Lei Lu, Duan Fan, Jinchun Shi, Junyu Huang, Sheng-Nian Luo
Engineering 2020, Volume 6, Issue 9, Pages 992-1005 doi: 10.1016/j.eng.2020.06.019
Thermomechanical, physical, and chemical processes in energetic materials (EMs) during manufacturing and processing or under external stimuli such as shock compression, involve multiple temporal and spatial scales. Discovering novel phenomena, acquiring new data, and understanding underlying mechanisms all require temporally and spatially resolved diagnostics. Here, we present a brief review of novel diagnostics that are either emerging or have existed but rarely been applied to EMs, including two-dimensional (2D) and three-dimensional (3D) X-ray imaging, X-ray diffraction, coherent X-ray diffraction imaging, small angle X-ray scattering, terahertz and optical absorption/emission spectroscopy, and one-dimensional (1D) and 2D laser-based velocity/displacement interferometry. Typical spatial scales involved are lattice (nanometer and micrometer) and typical temporal scales (femtosecond, picosecond, nanosecond, microsecond, and millisecond). The targeted scientific questions and engineering problems include defects, strengths, deformations, hot spots, phase changes, reactions, and shock sensitivities. Basic principles of measurement and data analysis, and illustrative examples of these are presented. Advanced measurements and experimental complexities also necessitate further development in corresponding data analysis and interpretation methodologies, and multiscale modeling
Keywords: Energetic materials X-ray Terahertz and optical diagnostics Multiscale measurements
A Fault Location Approach for the Testable Realization of Logic Functions
Pan Zhongliang
Strategic Study of CAE 2002, Volume 4, Issue 1, Pages 69-74
An approach of design for testability(DFT) for logic functions is presented in the paper, which employs AND gates and XOR gates tree to realize the generalized Reed-Muller expression of arbitrary logic functions. The major features of the approach are: 1) The circuits adopting the DPT techniques in the paper are totally fault locatable. 2) The circuits have universal test sets for fault detection, the cardinality of the test sets is (n + 5), where n is equal to the number of input variables in the logic function. A fault location method for the circuits is presented, which can identify all fault equivalence classes in the AND gates, and the faults in XOR gate tree in the circuits.
Keywords: logic functions Reed-Muller expressions design for testability single stuck at fault faults location
Differential coupling contributes to synchronization via a capacitor connection between chaotic circuits Regular Papers
Yu-meng XU, Zhao YAO, Aatef HOBINY, Jun MA
Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 4, Pages 571-583 doi: 10.1631/FITEE.1800499
Nonlinear oscillators and circuits can be coupled to reach synchronization and consensus. The occurrence of complete synchronization means that all oscillators can maintain the same amplitude and phase, and it is often detected between identical oscillators. However, phase synchronization means that the coupled oscillators just keep pace in oscillation even though the amplitude of each node could be different. For dimensionless dynamical systems and oscillators, the synchronization approach depends a great deal on the selection of coupling variable and type. For nonlinear circuits, a resistor is often used to bridge the connection between two or more circuits, so voltage coupling can be activated to generate feedback on the coupled circuits. In this paper, capacitor coupling is applied between two Pikovsk-Rabinovich (PR) circuits, and electric field coupling explains the potential mechanism for differential coupling. Then symmetric coupling and cross coupling are activated to detect synchronization stability, separately. It is found that resistor-based voltage coupling via a single variable can stabilize the synchronization, and the energy flow of the controller is decreased when synchronization is realized. Furthermore, by applying appropriate intensity for the coupling capacitor, synchronization is also reached and the energy flow across the coupling capacitor is helpful in regulating the dynamical behaviors of coupled circuits, which are supported by a continuous energy exchange between capacitors and the inductor. It is also confirmed that the realization of synchronization is dependent on the selection of a coupling channel. The approach and stability of complete synchronization depend on symmetric coupling, which is activated between the same variables. Cross coupling between different variables just triggers phase synchronization. The capacitor coupling can avoid energy consumption for the case with resistor coupling, and it can also enhance the energy exchange between two coupled circuits.
Keywords: Synchronization Voltage coupling Chaotic circuit Capacitor coupling
Research on the equivalent circuit parameter of single linear induction motor
Xu Wei,Sun Guangsheng
Strategic Study of CAE 2008, Volume 10, Issue 8, Pages 76-80
The SLIM parameter has clear error to its real value on the base of the RIM parameter measurement method because it has larger air gap and edge effect. This paper proposes a new scheme suited for SLIM parameter detection. It only needs input total power, phase voltage, phase current, frequency, and then computes primary resistance, primary leakage induction, secondary resistance, secondary leakage induction, air induction and iron loss resistance. The performance analysis of SLIM indicates that this method is very effective and valuable.
Keywords: single linear induction motor open-secondary circuit experiment blocked-secondary circuit experiment parameter measurement equivalent circuit
Development of High-purity Metal Sputtering Targets for Integrated Circuits
He Jinjiang , Lyu Baoguo , Jia Qian , Ding Zhaochong , Liu Shuqin ,Luo Junfeng , Wang Xingquan
Strategic Study of CAE 2023, Volume 25, Issue 1, Pages 79-87 doi: 10.15302/J-SSCAE-2023.01.003
High-purity metal sputtering target is one of the key basic materials for integrated circuits. Self-dependence of the sputtering targets is vital for the high-quality development of the integrated circuit industry in China. This study analyzes the application demand for and development status of high-purity metal sputtering targets for integrated circuits, involving high-purity aluminum and aluminum alloys, high-purity copper and copper alloys, high-purity titanium, high-purity tantalum, high-purity cobalt, high-purity nickel platinum, and high-purity tungsten and tungsten alloys. Moreover, it summarizes the challenges regarding the key manufacturing technologies and engineering application of high-performance sputtering targets in China and proposes several major development directions based on the development goals of the field by 2030. Specifically, China needs to improve its material processing technologies, focus on the key technologies for high-performance target processing, develop high-end new materials according to frontier demands, and improve the capabilities of material analysis, testing, and application evaluation. Furthermore, the following suggestions are proposed: establishing an industry-education-research-application system, realizing the domestic manufacturing of key equipment, strengthening talent team construction, establishing an independent intellectual property system, and expanding international exchange and cooperation,thereby promoting the development quality and level of high-purity metal sputtering targets.
Keywords: high-purity metal sputtering target integrated circuit thin film metallization
The Arithmetic of GTEM Cell Axe-shaped Piece´s Side Curve Equation
Zhou Xu
Strategic Study of CAE 2003, Volume 5, Issue 9, Pages 36-38
To be convenient for machining, the conventional axe-shaped pieces were approximately designed. It is proved that the traditional transition in a GTEM Cell can not give a satisfactory transmission loss distribution. So this paper gives the exact continuous curve equation for the axe-shaped piece´s two sides for the first time.
Keywords: giga-hz transverse electromagnetic cell the axe-shaped piece the side curve equation impedance matching
Title Author Date Type Operation
From Terahertz Imaging to Terahertz Wireless Communications
Yi Huang,Yaochun Shen,Jiayou Wang
Journal Article
A mechanical reliability study of 3-dB waveguide hybrid couplers in submillimeter and terahertz bands
Zhongqian Niu, Bo Zhang, Daotong Li, Dongfeng Ji, Yang Liu, Yinian Feng, Tianchi Zhou, Yaohui Zhang, Yong Fan,zhangbouestc@yeah.net
Journal Article
A high-precision terahertz retrodirective antenna array with navigation signal at a different frequency
Zhong-bo ZHU, Wei-dong HU, Tao QIN, Sheng LI, Xiao-jun LI, Jiang-jie ZENG, Xian-qi LIN, Leo P. LIGTHART
Journal Article
Graphene-metasurface for wide-incident-angle terahertz absorption
Ri-hui Xiong, Xiao-qing Peng, Jiu-sheng Li,lijsh2008@126.com
Journal Article
Frequency–angle two-dimensional reflection coefficient modeling based on terahertz channel measurement
Zhaowei CHANG, Jianhua ZHANG, Pan TANG, Lei TIAN, Li YU, Guangyi LIU, Liang XIA,changzw12345@bupt.edu.cn,jhzhang@bupt.edu.cn
Journal Article
Terahertz time-domain spectroscopy and micro-cavity components for probing samples: a review
Lin CHEN, Deng-gao LIAO, Xu-guang GUO, Jia-yu ZHAO, Yi-ming ZHU, Song-lin ZHUANG
Journal Article
Development Strategy of Free Electron Laser Technology in China
Li Peng, Li Ming, Wu Dai, Zhou Zheng, Tang Chun
Journal Article
Channelmeasurements and models for 6G: current status and future outlook
Jian-hua ZHANG, Pan TANG, Li YU, Tao JIANG, Lei TIAN
Journal Article
Standardization of 6G Key Technologies: Thoughts and Suggestions
Luo Yan, Quan Wei, Zhang Hongke
Journal Article
Novel X-ray and Optical Diagnostics for Studying Energetic Materials: A Review
Yiyang Zhang, Sen Chen, Yang Cai, Lei Lu, Duan Fan, Jinchun Shi, Junyu Huang, Sheng-Nian Luo
Journal Article
A Fault Location Approach for the Testable Realization of Logic Functions
Pan Zhongliang
Journal Article
Differential coupling contributes to synchronization via a capacitor connection between chaotic circuits
Yu-meng XU, Zhao YAO, Aatef HOBINY, Jun MA
Journal Article
Research on the equivalent circuit parameter of single linear induction motor
Xu Wei,Sun Guangsheng
Journal Article
Development of High-purity Metal Sputtering Targets for Integrated Circuits
He Jinjiang , Lyu Baoguo , Jia Qian , Ding Zhaochong , Liu Shuqin ,Luo Junfeng , Wang Xingquan
Journal Article