Wideband Slot Array Antenna Fed by Gap Waveguide with Right-Handed Circular Polarization and High Gain by Pejman Mahmoudi Kanesbi, Nasrin Amiri

“…A wideband and high-gain circularly polarized (CP) 16 × 16 array antenna based on gap waveguide technology is presented for millimeter-wave applications at 28 GHz frequency range. …”
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Electrically Tuned Microwave Devices Using Liquid Crystal Technology by Pouria Yaghmaee, Onur Hamza Karabey, Bevan Bates, Christophe Fumeaux, Rolf Jakoby

“…An overview of liquid crystal technology for microwave and millimeter-wave frequencies is presented. The potential of liquid crystals as reconfigurable materials arises from their ability for continuous tuning with low power consumption, transparency, and possible integration with printed and flexible circuit technologies. …”
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A Novel Mining Approach for Data Analysis and Processing Using Unmanned Aerial Vehicles by Ali Alenezi, Ahmad Sawalmeh, Hazim Shakhatreh, Muhannad Almutiry, Nasser Aedh Alreshidi

“…In this work, the pathloss models in millimeter-wave technology are considered because they provide massive data rates for line of sight scenarios. …”
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Multi-user joint RIS channel estimation based on ADMM by ZHU Luhu, WANG Anding

“…Addressing the challenges of high pilot overhead and computational complexity in traditional channel estimation methods for millimeter-wave communication systems aided by reconfigurable intelligent surfaces (RIS), a novel channel estimation algorithm based on the alternating direction method of multipliers (ADMM) for multi-user joint scenarios was proposed. …”
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Next-generation mmWave WLAN: vision and key enabling technologies by Min FAN, Siyuan SHAO, Chao HE, Xiang WANG, Haiming WANG

“…With the rapid development and wide applications of information and communication technologies, human production and life and social governance are evolving in the direction of digitizing, informatization, and intelligence.As one of the most widely applied wireless communication technologies, the wireless local area network (WLAN) needs to make further breakthroughs in the key performance such as data throughput, reliability, and latency and needs to add sensing functions and intelligence.The huge frequency resources of the millimeter wave (mmWave) band have injected new momentum into the development of WLAN.But the mmWave WLAN has also brought new technical challenges and requirements.Firstly, the WLAN development history was reviewed, and network structures, typical applications, development directions, and performance index requirements of WLAN in the future were summarized.Then, the characteristics of wireless channels in the mmWave band were given, and the new requirements and challenges for mmWave WLAN design were analyzed.Finally, some potential key technologies that may meet these challenges and requirements were discussed and prospected.…”
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A Broadband and High Gain Tapered Slot Antenna for W-Band Imaging Array Applications by Dong Sik Woo, Kang Wook Kim, Hyun-Chul Choi

“…A broadband and high gain tapered slot antenna (TSA) by utilizing a broadband microstrip- (MS-) to-coplanar stripline (CPS) balun has been developed for millimeter-wave imaging systems and sensors. This antenna exhibits ultrawideband performance for frequency ranges from 70 to over 110 GHz with the high antenna gain, low sidelobe levels, and narrow beamwidth. …”
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Wired and single sideband wireless service based on a single optical modulator by Weiping LI, Miao KONG, Yanyi WANG, Jianjun YU

“…In order to provide more flexible and convenient service for users in the hybrid transmission network,a novel system using a single optical modulator to provide wired and single side band (SSB) wireless signal was proposed.By combining the application of dual-polarization binary phase shift keying modulator (DP-BPSK),phase shifter and other devices,wired and SSB wireless signals were directly generated to suppress the walk-off effect caused by dispersion,and the effective transmission of 5 Gbit/s SSB wireless signal carried on 40 GHz millimeter wave and 10 Gbit/s wired signal over 65 km single-mode fiber (SMF) were successfully achieved.The experiments show that the application of polarization multiplexing technology and optical subcarrier multiplexing technology can make the signal have a greater improvement in transmission rate and performance,and play an important role in the future broadband communication network.…”
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Research on the spectrum sensing and sharing technology in the dynamic spatiotemporal data driven cognitive Internet of vehicles by Caili GUO, Jiujiu CHEN, Yidi XUAN, He ZHANG

“…With the explosive development of the intellectualization and network connection of the global automobile industry,the communication technology as a crucial support of the Internet of vehicles (IoV) is facing the problem of spectrum shortage.In addition to providing security services,the diverse service demands of the IoV make the introduction of the cognitive radio technology an effective solution,which can share heterogeneous spectrum resources integrating the sub-6 GHz and millimeter-wave spectrum resources with primary users.But the performance is limited due to the influence of the complex dynamic environment of the IoV.To address this issue,a novelty method was proposed which aimed to make full use of the potential multi-source dynamic spatiotemporal data,mine and learn the changing rules of the vehicle trajectory and traffic flow,and the rules were used to guide the sensing and sharing of the spectrum resource.The system-level simulation platform was built for simulation analysis,the results showed that the performance of the proposed scheme was effectively improved.…”
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Ultra-Wideband Fractal Ring Antenna for Biomedical Applications by Ilyas Saleem, Umair Rafique, Shobit Agarwal, Hüseyin Şerif SAVCI, Syed Muzahir Abbas, Subhas Mukhopadhyay

“…In UWB technology, short-range wireless communication is possible with low transceiving power, a characteristic that is particularly advantageous in the context of microwave and millimeter-wave (mmWave) medical imaging. In the proposed antenna configuration, the UWB response is achieved by introducing wedged slots in the radiating patch, designed on a low-loss substrate. …”
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Theoretical Study of Rotational Spectroscopy of Acetonitrile-d3 in the Ground and Different Excited Vibrational States by Motamedi Masoud, Moradi Parinaz

“…The millimeter-wave rotational spectra of the ground and excited vibrational states v8 = 1 and v8 = 2 of the symmetric top molecule CD3CN have been analyzed again. …”
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A 3D Printed Ka-Band High-Efficiency Wide-Slit Antenna Array for High-Power Microwave Applications by Liang Liu, Yu Yang, Shifeng Li, Xianghe Fang, Fanbao Meng, Chuan Yu

“…This antenna can be applied in high-power millimeter-wave systems.…”
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Research status and prospect of MIMO OTA test methods for 5G terminals by Nan MA, Fei YU, Xiaoli YANG, Xiaodong XU, Zhi ZHANG

“…MIMO (multi-input multi-output) OTA (over-the-air) testing is an important method to evaluate the radiation performance of the antenna system, as well as an indispensable step of research ＆ development (R ＆D) and mass production stages.With the advent of the 5G mobile communication system, the introduction of millimeter wave (mmWave) and other new technologies brings new challenges to the traditional MIMO OTA test method, and meanwhile makes OTA testing the only feasible solution for testing future 5G devices.Firstly, the challenges faced by 5G OTA testing was described.Then the applicability of the 4G mobile communication system OTA test method to the 5G OTA performance test was analyzed, and how to extend the low-frequency test method to the mmWave terminal test was studied.Then the current status of 3GPP’s research on MIMO OTA testing was summarized, and the system model, test principle, and performance evaluation indexes of simple-sectored multi-probe anechoic chamber (SS-MPAC) were explained in detail.In addition, smaller setup sizes can still yield reasonable measurement accuracy was verified.Finally, future research trends were prospected.…”
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W-Band GaAs pHEMT Power Amplifier MMIC Stabilized Using Network Determinant Function by Seong-Hee Han, Dong-Wook Kim

“…This paper presents a W-band power amplifier monolithic microwave integrated circuit (MMIC) that is designed for high-precision millimeter-wave systems and fabricated using a 0.1 µm GaAs pHEMT process. …”
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Circularly Polarized Leaky-Wave Antenna Based on Low-Loss Transmission Line by Xingying Huo, Zheng Li

“…A leaky-wave antenna with circular polarization property is proposed in millimeter-wave band, which can be applied in the wireless communication systems and remote sensing. …”
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5G urban rail traffic scenario classification and channel modeling by Ruisi HE, Bo AI, Zhangdui ZHONG, Mi YANG, Chen HUANG, Zhangfeng MA, Guiqi Sun, Hang MI, Chengyi ZHOU, Ruifeng CHEN

“…Urban rail traffic is an important part of modern transportation infrastructure.As a new generation of mobile communication technology, 5G can provide high data rate and low latency wireless transmission, which helps to improve the efficiency and service quality of urban rail traffic system.Due to the complexity of urban rail traffic scenarios, accurate communication scenario classification, channel characterization and channel models are required to provide theoretical support for the design of urban rail traffic 5G communication systems.The classification of 5G urban rail traffic radio propagation scenarios to support channel measurements and modeling was proposed.Current status of urban rail traffic channel measurements and modeling was shown, and the current challenges were analyzed.The applications of artificial intelligence in channel feature extraction and channel modeling were discussed, and the 5G urban rail traffic channels by considering reconfigurable intelligent surface and unmanned aerial vehicle were analyzed.Finally, the research on 5G urban rail traffic channel modeling at millimeter wave frequency band was described.…”
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Design of hybrid precoding with successive interference cancellation and alternating direction method of multipliers by Xiongwen ZHAO, Yao LIU, Yu ZHANG, Suiyan GENG, Peng QIN, Zhenyu ZHOU

“…To solve the problem of large power consumption caused by a large number of phase shifter (PS) in millimeter wave multi-antenna systems, a new type of dynamic connection structure was designed.With the goal of maximizing spectrum efficiency, two hybrid precoding schemes, successive interference cancellation (SIC) and successive interference cancellation-alternating direction multiplier (SIC-ADMM), were proposed.In SIC scheme, the sum-rate problem was decomposed into multiple sub-rate problems of different radio frequency links, the analog part was solved by iteration, and the digital part was solved by a low-dimensional equivalent matrix.Based on SIC scheme, an improved SIC-ADMM scheme was further proposed by studying the multi-variable sub-rate problem to achieve rapid convergence and reduce computational complexity effectively.The simulation results show that the proposed schemes have good spectrum and energy efficiencies by comparison with the existing schemes, and are more suitable for large-scale antenna systems.In addition, when a certain percentage of PS is turned off, the proposed scheme can greatly improve energy efficiency by sacrificing a small amount of spectrum efficiency.…”
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The Effectiveness of Hybrid Beamforming in Enhancing the Performance of NOMA-mmWave and Massive MIMO Systems by Oubassghir Mourtada, Boulouird Mohamed

“…As wireless networks evolve, the integration of Non-Orthogonal Multiple Access (NOMA), Massive Multiple Input Multiple Output (mMIMO), and millimeter wave (mmWave) technologies emerges as an effective approach to drive this advancement. …”
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Interference analysis between IMT-2020 (5G) system and broadcasting satellite service system in the band of 24.65～25.25 GHz by Rui HAN, Lei ZHANG, Wei LI, Shanshan LIU, Guan WANG, Chunhua LIU

“…Based on the Agenda Item 1.13 of WRC-19 and requirements for domestic compatibility analysis of 5G candidate frequency bands above 6 GHz,the interference from IMT-2020 system (5G) to broadcasting satellite service system in 24.65～25.25 GHz band was studied.The Monte Carlo simulation method was used to assess the aggregate interference from IMT base station (BS) to the up-link of feeder link of broadcasting satellite where the geostationary orbit satellite at 59℃,85℃ and 113℃ longitude.The aggregate interference level from 5G system to the two kinds of carriers of the satellite system with different orbits was evaluated via simulation analysis.Research results show that the IMT-2020 (5G) system will not cause harmful interference for broadcasting satellite services system.The results can provide technology basis for future planning of IMT-2020 (5G) system in millimeter wave and protecting of broadcasting satellite system.…”
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Channel Characteristics of High-Speed Railway Station Based on Ray-Tracing Simulation at 5G mmWave Band by Lei Xiong, Haiyang Miao, Bo Ai, Tutun Juhana, Adit Kurniawan

“…In order to satisfy the increasing demand for the higher transmission capacity of “smart station”, millimeter wave (mmWave) technology is expected to play a significant role in the high data rate communication system. …”
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Beamforming for Rotated 3D Multipanel Array Structures for 5G NR MIMO Transmission by Hyukjun Lee, Wonjae Ryu, Wonjin Sung, Jonghyun Park

“…Such transmission requires massive arrays to perform accurate high-gain beamforming over the millimeter-wave frequency band. There is no fixed form of array structures for 5G NR base stations, but they are likely to include multiple subarrays or panels for practicality of implementation and are expected to cover the user equipment (UE) in various locations. …”
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