A Broadband and High Gain Tapered Slot Antenna for W-Band Imaging Array Applications by Dong Sik Woo, Kang Wook Kim, Hyun-Chul Choi

“…This antenna can be applied to mm-wave phased array, imaging array for plasma diagnostics applications.…”
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Design of Multilevel Sequential Rotation Feeding Networks Used for Circularly Polarized Microstrip Antenna Arrays by Aixin Chen, Chuo Yang, Zhizhang Chen, Yanjun Zhang, Yingyi He

“…They can find wide applications in phased array radar and satellite communication systems.…”
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Key technologies of satellite communications aided by reconfigurable holographic surfaces by Xinyuan HU, Ruoqi DENG, Boya DI, Hongliang ZHANG, Lingyang SONG

“…Ultra-dense low earth orbit (LEO) satellite communication networks can overcome the scarcity of spectrum resources and the limited coverage of traditional terrestrial networks, and thus have the potential to provide high data rate services and global massive connectivity for terrestrial users.However, due to the high mobility of the satellites, LEO satellite networks put more stringent requirements on antenna technologies in terms of accurate beam steering and high antenna gain.Reconfigurable holographic surface (RHS), as a new type of metamaterial antenna, is investigated to assist LEO satellite communications.The RHS can electronically control the metamaterial units by leveraging the holographic principle to generate desired directional beams.Based on the hardware structure and holographic working principle of RHS, an RHS-assisted multi-satellite communication scheme was proposed, which considered both the LEO satellite tracking scheme and the data transmission scheme.A holographic beamforming optimization algorithm was also designed to maximize the sum rate.Simulation results verify the effectiveness of the proposed scheme and demonstrat that the RHS provids a more cost-effective way to support satellite communications than the conventional phased array antennas.…”
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Investigation on Harmonic Tuning for Active Ku-Band Rectangular Dielectric Resonator Antennas by Anda Guraliuc, Giuliano Manara, Paolo Nepa, Giuseppe Pelosi, Stefano Selleri

“…A slot-coupled rectangular dielectric resonator antenna (DRA) operating in the 14–14.5 GHz frequency band is investigated as a possible radiating element for an active integrated antenna of a transmitting phased array. The effectiveness of the resonator shape factor on achieving harmonic tuning is addressed. …”
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The Review of Beamforming Technology Based on Optical True Time Delay Line by Shiyi XIA, Guotong LI

“…The important role satellite communications plays in next-generation communication protocols brings both opportunities and challenges.Beamforming is an essential technology for effi cient and fl exible utilization of onboard resources.To explored a better beamforming technology, the optical control beamforming composed of the optical real-time delay line and the traditional analog beam were compared in principle.The phased array beamforming technology based on optical true time delay line meets the expectations of small size, lightweight, and low power in satellite communication.Phased arrays based on optical true delay lines could easily achieved no squint during beam scanning.The technical advantages and constraints of beamforming of optical real-time delay lines under diff erent technical paths were analyzed.For example, based on micro-ring resonator arrays, based on grating delay lines, based on multi-path switching and optical switches, and based on wavelength-selective optical true time delay lines.Finally, the research status of the existing optical beamforming technology was summarized.The possibility of realization in satellite interconnection was proposed, and its future development direction was predicted.…”
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ONE EVALUATION METHOD FOR THE CONTRIBUTION OF SUBSTRUCTURE STIFFNESS TO ARRAY FRAMEWORK STIFFNESS (MT) by WANG Chao, SUN XiaoGang, GU YeQing, Lü ZhenHua, Lü YiNing

“…Finally, taking a typical vehicle mounted phased array radar as an example, the contribution and matching of the box girder substructure and T type joint substructure to the array framework were analyzed detailly, and then the influence of the array panel on the substructure stiffness contribution of the frame was analyzed. …”
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Challenges and Innovations in CMOS-Based 300-GHz Transceivers for High-Speed Wireless Communication by Minoru Fujishima

“…This article discusses the challenges of implementing CMOS transceivers at such high frequencies, focusing on power amplification, phased array architectures, and low-power, high-speed demodulation circuits. …”
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Improved least mean square algorithm based in satellite multi-beamforming by Yu-meng ZHANG, Ming-chuan YANG, Xiao-feng LIU, Zhong-zhao ZHANG

“…High-throughput satellites use multi-beam technology to achieve polarization isolation and spatial isolation to reuse frequency resources,resulting in increased traffic capacity,but this presents a higher demand for fast adaptive beamforming algorithms.In order to solve the shortcoming that the convergence rate and steady-state error can not be satisfied simultaneously when using the LMS algorithm,an improved least mean square algorithm was proposed,which used the statistical average gradient update to solve the problem of the formation of beam instability caused by the instantaneous gradient,which can speed up at the beginning of the beamforming and maintain a small error value after the convergence has reached a steady state.The use of 61-element hexagonal array phased array antenna to form a 7-point beam in an environment where high-throughput satellites have a strong rainfall attenuation was considered.The results show that the improved algorithm can greatly improve the convergence speed and obtain better steady state performance under the condition of only a small increase in complexity,which can be applied to high-throughput satellite beamforming technology with severe inter-beam co-channel interference in emergency communication scenarios.…”
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SAR Experiments Using a Conformal Antenna Array Radar Demonstrator by Peter Knott, Thomas Bertuch, Helmut Wilden, Olaf Peters, Andreas R. Brenner, Ingo Walterscheid

“…For practical trials the antenna has been adapted for operation with the Phased Array Multifunctional Imaging Radar (PAMIR) system developed at the institute. …”
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Synthesis of frequency diverse array with large null depths via a hybrid optimisation approach of mayfly algorithm and convex programing by Xiaolang Shao, Taiyang Hu, Jinyu Zhang, Zelong Xiao

“…Abstract By controlling the null distribution in the range‐angle dimension, the frequency diverse array (FDA) can handle range‐dependent interference, which is usually difficult to solve for the traditional phased array. However, the current investigations focus more on the design of weights for null control, ignoring the unique design dimension of FDA, that is, the frequency offsets. …”
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A Novel Coherence Reduction Method in Compressed Sensing for DOA Estimation by Jing Liu, ChongZhao Han, XiangHua Yao, Feng Lian

“…This method is then extended to a more practical condition when highly coherent columns and incoherent columns are considered, for example, the direction of arrival (DOA) estimation problem in phased array radar system using compressed sensing. Numerical simulations show that the proposed method succeeds in identifying multiple targets in a sparse radar scene, where the compressed sensing method based on the original sensing matrix fails. …”
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An Improved Peak Sidelobe Reduction Method for Subarrayed Beam Scanning by Hang Hu, Xuepeng Luan, Guanglei Zhang, Ke Song, Weihui Liu, Chenghu Mou

“…This paper focused on PSL (peak sidelobe level) reduction for subarrayed beam scanning in phased array radars. The desired GSP (Gaussian Subarray Patterns) are achieved by creating a subarray weighting network. …”
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Design and Implementation of a Binary Phase-Shift Keying Frequency Diverse Array: Considerations and Challenges by Nicholas R. Munson, Bill Correll, Justin K. A. Henry, Ram M. Narayanan, Travis D. Bufler

“…The frequency diverse array (FDA) is an architecture capable of beamforming in both range and angle, improving upon the traditional phased array (PA) which can only achieve beamforming in angle. …”
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Effects of Atmospheric Refraction on an Airborne Weather Radar Detection and Correction Method by Lei Wang, Ming Wei, Tao Yang, Ping Liu

“…Using three types of typical atmospheric background sounding data, we established a simulation model for an actual transmission path and a fitted correction path of an airborne weather radar beam during airplane take-offs and landings based on initial flight parameters and X-band airborne phased-array weather radar parameters. Errors in an ideal electromagnetic beam propagation path are much greater than those of a fitted path when atmospheric refraction is not considered. …”
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Stepped Frequency Pulse Frequency Diverse Array Radar for Target Localization in Angle and Range Domains by Ming Tan, Chun-yang Wang, Zhi-hui Li, Xin Li, Lei Bao

“…Unlike phased array bringing angle-dependent and range-independent beamforming, a new kind of radar system called frequency diverse array (FDA) has been widely used for its ability to generate angle-range-dependent beampattern, which provides a broad prospect of radar application. …”
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Towards a spectrally multiplexed quantum repeater by Tanmoy Chakraborty, Antariksha Das, Hedser van Brug, Oriol Pietx-Casas, Peng-Cheng Wang, Gustavo Castro do Amaral, Anna L. Tchebotareva, Wolfgang Tittel

“…Here we demonstrate the concurrent employment of (1) spectrally multiplexed cavity-enhanced spontaneous parametric down-conversion in a nonlinear crystal; (2) a virtually-imaged phased array that enables mapping of spectral modes onto distinct spatial modes for frequency-selective detection; and (3) a cryogenically-cooled Tm3+:LiNbO3 crystal that allows spectral filtering in an approach that anticipates its use as a spectrally-multiplexed quantum memory. …”
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A Novel Linear Sparse Array with Reconfigurable Pixel Antenna Elements by Ming Li, Haiping Wei, Jiahao Zhao, Qingchang Tao, Zheng You

“…Simulation results show that the gain fluctuation and sidelobe level of the array during beam scanning have significant advantages over the previous phased array, and the generation of antenna grating lobes is avoided. …”
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The role of non-alcoholic fatty liver disease in the formation of atherosclerotic vascular lesions in patients with abdominal obesity by N. L. Denisov, V. B. Grinevich, Ye. V. Chernetsova, Yu. A. Kravchuk, K. V. Ivashkin

“…Measurement of the intima-media complex thickness of the common carotid artery (IMT CCA) was performed by standard procedures at Voluson 730 Expert device, equipped with 7,5 MHz linear phased array transducer. The presence of early atherosclerotic markers was evaluated by local thickening of the IMT CCA over 0.86 mm in any point of the carotid artery (IMT CCA max). …”
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An X-Band 6-Bit Hybrid True Time Delay With Linearly-Controlled Gₘ-C All-Pass Filter in 28nm FDSOI CMOS by Soon-Hyeok Kwon, Jung-Dong Park

“…This paper presents a 6-bit hybrid True Time Delay (TTD) circuit designed for X-band phased array antenna systems. The circuit integrates a conventional transmission-line (T-line) based TTD structure for short delays (1.56 ps, 3.125 ps, 6.25 ps, 12.5 ps) with a Gm-C-based all-pass filter (APF) employing a thermostat method for longer delays (25 ps, 50 ps, 75 ps). …”
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Double Coherent Scatter Radars Observations of the Daytime F‐Region Irregularities in Low‐Latitudes on 29 May 2017 by Pengfei Hu, Gang Chen, Guozhu Li, Chunxiao Yan, Shaodong Zhang, Guotao Yang, Yaxian Li, Zhiqiu He, Wei Jia, Min Zhang

“…Abstract In the morning on 29 May 2017, the Sanya very‐high‐frequency Radar and the Hainan COherent Scatter Phased Array Radar (HCOPAR) at Fuke were cooperated with similar operating frequencies to investigate the dissipation of the daytime F‐region Field‐Aligned Irregularities (FAIs). …”
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