The Development of Intelligent Beamforming Antenna Systems for Stratospheric Platforms in the Millimeter-Wave Band

Tsuji, Hiroyuki; Oodo, Masayuki; Suzuki, Masatoshi

doi:10.1007/s11277-005-0744-1

Cited by 2 publications

(6 citation statements)

References 8 publications

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“…As shown in Fig. 8, recent efforts and solutions on the antenna-related research including antenna design [129]- [132], beam tracking [10], [32], [133], [134], and beam optimization [135] will be summarized in the following subsection.…”

Section: A Antenna Techniquementioning

confidence: 99%

“…Based on this insight, Tsuji et al [129] conducted the experiments to test the performance of digital beamforming (DBF) antenna and multi-beam horn (MBH) antenna for mmWave frequency band under the stratospheric conditions. To be specific, as for array antenna design, the authors proposed an electronically controlled mmWave DBF antenna for HAPS.…”

Section: ) Antenna Designmentioning

confidence: 99%

“…In the context of UAV-enabled HAPS system and SPF system with mmWave communications, Tsuji et al [129] also developed an mmWave MBH antenna that can achieve high-speed transmission at 47 GHz and 48 GHz. To be specific, the antenna direction of mmWave MBH antenna was devised to own three control modes: i) fixed mode: MBH antenna cannot adjust the direction; ii) inclination adjustment mode: the direction of beam was adjusted as the helicopter changes its inclination; iii) inclination/position adjustment mode: the footprint can be controlled in the same spot.…”

Section: B: Beam Antennamentioning

confidence: 99%

“…Furthermore, mmWave MBH antenna was demonstrated to possess several advantages in controlling the antenna beams, such as broad bandwidth, low development cost and low power consumption. Similar to the experiments for mmWave DBF antenna in [129], MBH antenna was also installed on the helicopter to test its performance over the HAPS system. The measurement mission included beam tracking, beam pattern, FIGURE 10.…”

Section: B: Beam Antennamentioning

confidence: 99%

“…Finally, experiment results showed that the system can work properly and further demonstrated that highly directional beams can solve the disadvantage of UAV-assisted wireless networks, which becomes a major component of mmWave UAV communications for 5G and beyond. The main features of the devised antennas in [129] are summarized in Table 4.…”

Section: B: Beam Antennamentioning

confidence: 99%

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A Survey on 5G Millimeter Wave Communications for UAV-Assisted Wireless Networks

et al. 2019

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In recent years, unmanned aerial vehicles (UAVs) have received considerable attention from regulators, industry and research community, due to rapid growth in a broad range of applications. Particularly, UAVs are being used to provide a promising solution to reliable and cost-effective wireless communications from the sky. The deployment of UAVs has been regarded as an alternative complement of existing cellular systems, to achieve higher transmission efficiency with enhanced coverage and capacity. However, heavily utilized microwave spectrum bands below 6 GHz utilized by legacy wireless systems are insufficient to attain remarkable data rate enhancement for numerous emerging applications. To resolve the spectrum crunch crisis and satisfy the requirements of 5G and beyond mobile communications, one potential solution is to use the abundance of unoccupied bandwidth available at millimeter wave (mmWave) frequencies. Inspired by the technique potentials, mmWave communications have also paved the way into the widespread use of UAVs to assist wireless networks for future 5G and beyond wireless applications. In this paper, we provide a comprehensive survey on current achievements in the integration of 5G mmWave communications into UAV-assisted wireless networks. More precisely, a taxonomy to classify the existing research issues is presented, by considering seven cutting-edge solutions. Subsequently, we provide a brief overview of 5G mmWave communications for UAV-assisted wireless networks from two aspects, i.e., key technical advantages and challenges as well as potential applications. Based on the proposed taxonomy, we further discuss in detail the state-of-the-art issues, solutions, and open challenges for this newly emerging area. Lastly, we complete this survey by pointing out open issues and shedding new light on future directions for further research on this area. INDEX TERMSMillimeter wave (mmWave) communications, unmanned aerial vehicle (UAV), mmWave UAV communications, UAV-assisted wireless networks, 5G and beyond.HAITAO XU received the B.E. degree in communication engineering from Sun Yat-sen University, Guangzhou, China, in 2007, the M.E. degree in communication system and signal processing from the University of Bristol, U.K., in 2009, and the Ph.D. degree in communication and information systems from the

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Section: A Antenna Techniquementioning

confidence: 99%

Section: ) Antenna Designmentioning

confidence: 99%

Section: B: Beam Antennamentioning

confidence: 99%

Section: B: Beam Antennamentioning

confidence: 99%

Section: B: Beam Antennamentioning

confidence: 99%

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A Survey on 5G Millimeter Wave Communications for UAV-Assisted Wireless Networks

et al. 2019

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Effect of post-treatments on the fatigue behaviour of 316L stainless steel manufactured by laser powder bed fusion

Elangeswaran

Cutolo

Muralidharan

et al. 2019

International Journal of Fatigue

141

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This paper investigates the influence of post treatments on the fatigue properties of 316L stainless steel produced by laser powder bed fusion. Miniaturised fatigue samples are built in vertical orientation with optimised process conditions to result in very low porosities and minimal scatter in results. Fatigue performance is evaluated for two different material conditions: as-built and stress-relieved, at a nominal load ratio of -1. Furthermore, the samples are tested with and without surface machining. A thorough microstructural and fractographic analysis is performed to evaluate the impact of the main fatigue influencing factors. The results show that the fatigue behaviour of machined samples with and without stress relief heat treatment exceeds that of conventionally manufactured 316L.

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The Development of Intelligent Beamforming Antenna Systems for Stratospheric Platforms in the Millimeter-Wave Band

Cited by 2 publications

References 8 publications

A Survey on 5G Millimeter Wave Communications for UAV-Assisted Wireless Networks

A Survey on 5G Millimeter Wave Communications for UAV-Assisted Wireless Networks

Effect of post-treatments on the fatigue behaviour of 316L stainless steel manufactured by laser powder bed fusion

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