Article
Engineering, Electrical & Electronic
Ruolei Xu, Zhi Ning Chen
Summary: The proposed metasurface lens array fed by a phased array offers a compact solution for beamsteering applications with reduced thickness and cost. Beamsteering is achieved in two steps, first by switching the main beam direction over a large angular step, and then fine tuning with a low-cost phased array. The antenna design achieves a wide coverage range with high gain and low profile compared to conventional arrays and single-aperture lenses.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Optics
Chao Li, Kan Wu, Xianyi Cao, Guangjin Zhang, Xinwan Li, Jianping Chen
Summary: A monolithic transceiver based on a CMOS-compatible silicon photonic platform for lens-assisted beam-steering Lidar application has been demonstrated. This transceiver integrates beam emitting, steering, and receiving on a single chip, utilizing a U-shaped vertical Ge photodetector structure for high-efficiency light transmission and reception. The on-chip photodetector has a bandwidth of 87 MHz, a responsivity of 0.3A/W, and a detection sensitivity of -20 dBm.
Article
Engineering, Electrical & Electronic
Ruitao Liu, Wei Zhang, Xianxiang Yu, Qinghui Lu, Wenqiang Wei, Lingjiang Kong, Guolong Cui
Summary: This paper focuses on the design of a virtual low-sidelobe beampattern in distributed phased-MIMO radar. An iterative framework is proposed to minimize the beampattern Peak Sidelobe Level (PSL), considering practical position constraints and the mainlobe level restriction. The efficient cyclic optimization algorithm and the SDR technique are utilized for subarray layout optimization and receive weighting coefficient design.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Optics
Guangzhu Zhou, Shi-Wei Qu, Baojie Chen, Yuansong Zeng, Chi Hou Chan
Summary: This paper presents a metasurface-based Fourier lens fed by compact plasmonic optical antennas for wide-angle beam steering. The proposed device has a wide beam steering range, good radiation characteristics, small footprint, and ease of integration, making it suitable for various integrated photonics applications.
Article
Engineering, Electrical & Electronic
Maria Alonso-delPino, Sjoerd Bosma, Cecile Jung-Kubiak, Goutam Chattopadhyay, Nuria Llombart
Summary: This study proposes a hybrid electromechanical scanning lens antenna array architecture for steering highly directive beams at submillimeter wavelengths, combining electronic phase shifting of a sparse array with mechanical translation of a lens array. Additionally, a novel leaky wave lens feed concept is implemented for achieving wide bandwidth and large steering angles in the antenna system.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Chengzhe Shi, Wensheng Pan, Ying Shen, Shihai Shao
Summary: This study introduces a TxBF SI cancellation design to address the RF front-end saturation issue in STAR phased array systems. The approximate solution helps effectively control the loss of beamforming gain within a certain uncertainty channel error bound.
IEEE SIGNAL PROCESSING LETTERS
(2022)
Article
Computer Science, Information Systems
Dujuan Hu, Xizhang Wei, Mingcong Xie, Yanqun Tang
Summary: This paper proposes a joint design of sparse arrays and beamforming using genetic algorithm and alternating optimization algorithm to balance the cost and performance of the aperture-level simultaneous transmit and receive (ALSTAR) system. The simulation results demonstrate that the proposed design can reduce the system cost with little performance loss of isotropic isolation (EII).
Article
Computer Science, Artificial Intelligence
Zhenkai Zhang, Hamid Esmaeili Najafabadi, Henry Leung, Biao Jin
Summary: This paper proposes a joint array resource allocation and transmit beamforming approach for tracking multiple targets using phased array radar. The optimization problem is solved to allocate array resources and develop beamforming with null steering capability. A cyclic algorithm scheme is proposed to tackle the challenging optimization problem, separating it into two simpler convex problems, and the projected gradient descent method with penalty function is applied for the optimal beamforming design with null steering.
EXPERT SYSTEMS WITH APPLICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Laila Marzall, Connor Nogales, Scott Schafer, Gregor Lasser, Zoya Popovic
Summary: This article presents the design and nonlinear analysis of an octave-bandwidth transmit in-phase power combiner feed network. OTA measurements show the variation of EIRP and ACPR over different frequencies, powers, and supply voltages, providing important references for the implementation of in-phase spatial power combiner.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Engineering, Electrical & Electronic
Sen Liu, Qiang Chen
Summary: This article proposes a novel wideband, multifunctional space-fed planar array antenna design with independently controlled forward/backward beams by introducing a novel polarization-dependent unit cell and developing a GSM-based network model. Through system-level analysis, the design concept is verified with a prototype demonstrating the expected performance. Additionally, experimental results confirm the potential for bidirectional wireless communication applications.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Alessandro Garufo, Giorgio Carluccio
Summary: Closed-form expressions for the active admittance and impedance of connected arrays based on dipole and slot antennas in a hexagonal lattice are introduced and discussed. The derivation is based on multilayer Green's function spectral representation and hexagonal lattice properties. The discussed formulas provide insight on differences in active impedance behavior between hexagonal and rectangular lattices, offering a design tool for analyzing connected arrays without full-wave simulations.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Chesney Buyle, Lieven de Strycker, Liesbet Van der Perre
Summary: Ultrasound phased arrays have been widely used in various fields such as medical diagnosis, nondestructive testing, and sonar. However, current low-cost ultrasound phased array systems lack broadband transmission and wide angular beam steering capabilities. This work presents a low-cost ultrasound phased array system that can transmit both narrowband and broadband signals. Accurate beam steering is achieved through the concept of Direct Digital Synthesis (DDS) and small, wide bandwidth MEMS transducers are used to enable grating lobe free beam patterns and broad angular beam steering range.
IEEE SENSORS JOURNAL
(2022)
Article
Acoustics
Jesse T. Yen, Man Minh Nguyen, Yang Lou, Jun S. Shin, Yuling Chen, Harry L. Tarnoff
Summary: Low-cost ultrasound imaging systems are widely used in various medical departments. Novel Fresnel-based beamforming methods are being investigated to further miniaturize and reduce the cost of ultrasound systems. Additionally, combining with dual apodization with cross correlation (DAX) technique can improve imaging contrast.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2021)
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
Engineering, Electrical & Electronic
Thomas Jaschke, Arne F. Jacob
Summary: The reported terminal antenna operates at 20 and 30 GHz, which corresponds to the downlink and uplink frequency bands of satellite communication systems. This study focuses on integrating the receive and transmit paths in a single aperture using a passive array, showing advantages over traditional solutions with two separate antennas. The array consists of eight linear subarrays composed of alternating send-only and combined receive/transmit endfire antenna elements. It is implemented in substrate-integrated waveguide technology and covered with a periodically shaped dielectric lens for improved matching. Cross-polarization is mitigated in the pointing direction using a proposed technique. The array parameters are measured and the module patterns confirm the simulated results, indicating a bandwidth of over 2.5 GHz for both receiving and transmitting.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
