Article
Engineering, Electrical & Electronic
Hong-Jib Yoon, Byung-Wook Min
Summary: This paper presents a fast far-field phased array calibration/beamforming method using an improved version of the REV method. Experimentally verified, the improved method reduces the number of required measurements and enhances the accuracy and efficiency of the calibration process.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Computer Science, Hardware & Architecture
Chong Han, Longfei Yan, Jinhong Yuan
Summary: This article investigates the challenges and features of THz hybrid beamforming design, discussing the poor spatial degree-of-freedom and blockage problems caused by extreme sparsity of the THz channel. It presents three novel THz-specific hybrid beamforming architectures and demonstrates the potential data rate, power consumption, and array gain capabilities for THz communications. Multiple open problems and potential research directions are elaborated as a roadmap of THz hybrid beamforming design.
IEEE WIRELESS COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Matthew Giorgis Anderson, Arno Thielens, Stijn Wielandt, Ali M. Niknejad, Jan M. Rabaey
Summary: This paper presents a method for low-power RF beamforming utilizing transmission-line transformers and balanced impedance phase shifters. The method offers advantages of low loss, simplicity, and scalability, and extends the beam-steering range through the introduction of a crossover switch.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2022)
Article
Engineering, Electrical & Electronic
Feifei Gao, Bolei Wang, Chengwen Xing, Jianping An, Geoffrey Ye Li
Summary: In this paper, two wideband hybrid beamforming approaches are proposed to address the beam squint issue in massive MIMO systems, based on virtual sub-array and TTD lines respectively. These methods enhance beamforming performance and resolve hardware implementation contradiction.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Cornelis R. Wilke, Stefan J. Wijnholds, Jacki Gilmore
Summary: This article discusses the calibration of antenna array receive path gains using self-holography (SH). By analyzing the mathematical model underlying SH and extracting an expression for the signal-to-interference ratio (SIR), the accuracy of gain estimates can be related to the level of interference in the reference signal. Through application to practical examples, accurate assessment criteria have been successfully derived.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Yu Liu, Rui Zhu, Quanhua Liu
Summary: Frequency diverse array (FDA) is a potential solution for improving radar performance. This study proposes a low-cost implementation of FDA using the two-wave mixing technique. The method involves propagating two linear frequency modulated continuous wave signals against each other, converting their frequency differences to a frequency offset in FDA through periodic mixing operations. The proposed FDA automatically generates a desired frequency distribution, phase correlation, and additional phase control capability. A mirrored two-wave mixing FDA is also introduced to control waveform propagation direction.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
Article
Computer Science, Information Systems
Iyemeh E. Uchendu, James R. Kelly, Raj Mittra, Yue Gao
Summary: This paper introduces an antenna design that combines phased array steering and parasitic steering to achieve improved antenna gain and steering resolution. Experimental results show that this hybrid antenna design outperforms conventional arrays in terms of realized gain and steering speed.
Article
Engineering, Multidisciplinary
Fuguo Zhu, Jinping Zhang, Donghai Xu, Lei Sun, Zhipeng Zhou
Summary: This paper presents the design of an active phased array antenna for the Gaofen-3 satellite, including its architecture, system design methods, key hardware, and performance characteristics. The proposed phased array antenna has various capabilities and exhibits excellent performance in ground and on-orbit tests.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Engineering, Aerospace
Randy Larry Haupt, Chad Kidder
Summary: Phased arrays have become increasingly important in communications and radar systems, which require wideband signals to achieve high-performance goals. However, traditional time-harmonic analysis methods do not capture all frequency performance constraints imposed by the array architecture. Grating lobes, pulse/symbol dispersion, beam squint, and hardware frequency limits all limit the bandwidth and size of the phased array.
IEEE AEROSPACE AND ELECTRONIC SYSTEMS MAGAZINE
(2023)
Article
Engineering, Electrical & Electronic
Longfei Yan, Chong Han, Jinhong Yuan
Summary: This paper introduces a novel DS-FTTD structure to address the beam squint issue in hybrid beamforming, and proposes a low-complexity RD algorithm to design hybrid beamforming matrices, which can significantly improve energy efficiency and array gain.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Reza Karimian, Sajjad Taravati, Mansoor Dashti Ardakani, Shahrokh Ahmadi, Mona E. Zaghloul
Summary: This study introduces a nonreciprocal-beam phased-array antenna that provides power amplification in both transmission and reception states. Compared to other antenna designs, this antenna does not introduce undesired time harmonics and frequency conversion, and does not require an RF bias signal.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Computer Science, Interdisciplinary Applications
Zicheng Zhou, Xiaopeng Lu, Yufan Yao, Yang Niu, Xin Fang, Xingwang Qiao, Guan-Long Huang, Changqing Gu
Summary: This work proposes a detailed modeling method that includes all states of each active device to achieve high-precision and fast off-line estimation of beamforming pattern. Experimental verification demonstrates high accuracy in both beam steering angle and beam width, as well as excellent side lobe level accuracy. This technology enables quick derivation of optimal beam controlling codes for large active phased array antennas and simplifies measurement and online compensation works for numerous beams.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Hassna Ouassal, Ming Yan, Jeffrey A. Nanzer
Summary: This paper introduces a new approach to distributed synchronization for coordinating nodes in distributed antenna arrays, utilizing consensus optimization among nodes without centralized control. Through iterative frequency exchange, decentralized frequency consensus can be achieved, enabling distributed beamforming.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2021)
Article
Engineering, Multidisciplinary
Sol Kim, Hyun-Jun Dong, Jong-Won Yu, Han Lim Lee
Summary: This paper presents a highly efficient phased array calibration system based on far-field scanning of the array antenna. The proposed system detects the minimum vector-sum point and tracks the behavior of the null point. The feasibility of the proposed system is verified through implementation and comparison with the conventional method.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Rui Zhu, Yu Liu, Bin Wang, Weifeng Zhang, Qiang Xu, Quanhua Liu
Summary: Large-scale phased array is a critical component in wireless communication systems, but its high cost and complexity hinder its widespread commercial use. A low-cost solution based on frequency-controlled beam-steering method has been proposed, which changes the beam pointing direction with a single-frequency controller without varying phase shifters or tunable components. However, accurately splitting the input IF and LO waves to the mixer's array remains a challenge. This communication discusses the practical design consideration of a robust two-wave mixing array and presents a successful signal distribution network for achieving the desired converted RF signal.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
