Article
Computer Science, Information Systems
Parth Mehta, Kumar Appaiah, Rajbabu Velmurugan
Summary: A new spatial IIR beamformer based direction-of-arrival (DoA) estimation method is proposed, which improves the performance parameters of a beamformer. The proposed method outperforms the previous feedback beamforming approach and the conventional beamformer. By incorporating a retransmission based minimum variance distortionless response (MVDR) beamformer, the proposed method achieves lower estimation error compared to prior methods such as MUSIC, ESPRIT, robust MVDR, nested-array MVDR, and reduced-dimension MVDR methods, especially at low SNR levels.
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
Chan-Ho Hwang, Tae-Hwan Joo, Ju-Man Park, Kichul Kim, Jae-Soo Jung
Summary: This paper introduces a multi-beam search method based on an active phased array antenna system using digital beamforming, showcasing the performance in estimating each channel's angle and ensuring the beam directional error is within 0.5 degrees through simulation and measurement.
JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS
(2022)
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
Qun Chen, Lin Bai, Chong He, Ronghong Jin
Summary: The study focused on the performance analysis and experimental verification of the time-modulated array (TMA)-based space-division multiple access (SDMA) approach, proposing a novel harmonic selection method and verifying its advantages through numerical results compared to traditional systems.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Computer Science, Information Systems
Oday Bshara, Vasil Pano, Md Abu Saleh Tajin, Xaime Rivas Rey, Kapil R. Dandekar
Summary: This paper introduces a novel technique for fast beam selection at mmWave frequencies, utilizing an Alford loop antenna for DoA estimation at sub-6GHz frequencies. Through measurements and the design of an SDR testbed, the feasibility of this technique in practical applications is demonstrated.
Article
Engineering, Electrical & Electronic
Martijn de Kok, Cornelis J. C. Vertegaal, A. Bart Smolders, Ulf Johannsen
Summary: An active transmitarray antenna is proposed for a Ka-band monopulse tracking radar, utilizing commercial SiGe-based 5G beamforming chips to demonstrate the benefits of Ka-band communication developments in radar technology. Three arrays of different designs are presented and compared, all achieving sub-1 degrees HPBW, peak SLL below -26 dB, and EIRP of 100 dBm at broadside with a +/- 60 degrees scan range. A small-scale demonstrator is also realized, showcasing a peak EIRP of 56 dBm, 12 degrees HPBW, and scanning capability up to +/- 60 and +/- 45 degrees in the H-plane and E-plane, respectively, with minimal scan loss.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
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, Electrical & Electronic
Alexander J. Mackay, George V. Eleftheriades
Summary: Peripherally excited (PEX) phased arrays can achieve various shaped beams by controlling the magnitude and phase of the antenna's peripheral sources, offering a simple and cost-effective solution. A linear system of equations is developed using a simple model of fields in a parallel-plate waveguide to find the best peripheral source excitations that approximate a desired field pattern. The model successfully synthesizes uniform broadside beams and cosecant beams with higher aperture illumination efficiency than equal-amplitude excitation. The linear system can be integrated with particle swarm optimization (PSO) for controlled sidelobe levels, flat-top, and multibeam patterns, demonstrating good agreement with ideal and predicted beams in full-wave simulation.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Aerospace
Pirmin Schoeder, Vinzenz Janoudi, Timo Grebner, Christian Waldschmidt
Summary: To simulate realistic radar scenarios, radar target simulators need to generate targets in all four radar dimensions. Coherent direction-of-arrival (DoA) simulation enables accurate and flexible angular simulation without requiring excessive hardware. This article presents a unified general model for coherent DoA simulation in radar target simulators, allowing the simulation of arbitrary and adjustable DoAs without constraints. The proposed models and methods are validated through analytical derivations, simulations, and measurements, proving the concept's general applicability.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2023)
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
Optics
Zhi Li, Zihan Zang, Zixian Wei, Yaqi Han, Lican Wu, Zhenquan Zhao, Mutong Li, H. Y. Fu
Summary: The infrared optical wireless communication system utilizes passive diffractive optics and virtually imaged phased array technology to achieve multi-user accessibility and high-speed data transmission. By generating multiple beams and tuning the wavelength, the system demonstrates improved performance and flexibility.
Article
Chemistry, Physical
Shaoqiu Jiang, Rongguo Song, Zelong Hu, Yitong Xin, Guan-Long Huang, Daping He
Summary: In this paper, the authors proposed phased array antennas based on highly conductive graphene-assembled film for 5G millimeter wave applications. They designed and fabricated two different types of phased array antennas and demonstrated their advantages in terms of operating bandwidth and beam pointing performance.
Article
Engineering, Multidisciplinary
Xiao-feng Gao, Ping Li, Xin-hong Hao, Guo-lin Li, Zhi-jie Kong
Summary: This paper proposes a novel algorithm for direction of arrival (DOA) estimation using directional antennas in cylindrical conformal arrays (CCAs). By dividing the arrays into subarrays to eliminate shadow effects and considering the anisotropic radiation pattern, an improved interpolation method is used to achieve DOA estimation with low computational complexity. The algorithm shows superior performance, especially under low signal-to-noise ratio environments, as verified by numerical simulations.
DEFENCE TECHNOLOGY
(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
H. Zakerifar, A. Khaleghi, H. Aliakbarian
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2017)
Article
Engineering, Electrical & Electronic
Mehdi Taherkhani, Jalaledin Tayebpour, Soheil Radiom, Hadi Aliakbarian
IET MICROWAVES ANTENNAS & PROPAGATION
(2019)
Article
Engineering, Electrical & Electronic
Reza Yazdani, Mahdi Yousefi, Hadi Aliakbarian, Homayoon Oraizi, Guy A. E. Vandenbosch
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2020)
Article
Engineering, Electrical & Electronic
Farid Nazari, Mehdi Taherkhani, Majid Mokhtari, Hadi Aliakbarian, Omid Shekoofa
IET SCIENCE MEASUREMENT & TECHNOLOGY
(2020)
Article
Education, Scientific Disciplines
Soudabeh Afshar, Farid Nazari, Hadi Aliakbarian
Summary: The capacitance technique is a simple method for determining the dielectric constant of dielectric sheets in the low-frequency band. A new methodology and test procedure have been introduced to eliminate capacitor effects and improve measurement accuracy. The method can be applied to arbitrarily-shaped dielectric sheets with good effectiveness, achieving 7% accuracy in prototype testing.
EUROPEAN JOURNAL OF PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Mohaddeseh Shahrbandian, Hadi Aliakbarian
Summary: This study introduces a new concept in the design of symmetric long-slot leaky-wave antennas, converting a radiation null in the broadside direction to a peak in the radiation pattern using a cover layer. The antenna design shows significant improvement in radiation pattern with more than 18 dB gain, covered by an FR4 layer on the waveguide.
IET MICROWAVES ANTENNAS & PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Morteza Ghaderi Aram, Hadi Aliakbarian, Hana Dobsicek Trefna
Summary: This study introduces a compact UWB elliptical phased-array applicator for hyperthermia systems, with ultra-wideband operation range and good isolation performance. Experimental results show that the antenna achieved very good quality metrics in treating patients.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Amir Zahedi, Farhad Akbari Boroumand, Hadi Aliakbarian
Summary: This study presents a novel method using a cross-resonator for complex permittivity measurement, offering high accuracy with a relative error less than 1% over the frequency range. The symmetrical structure eliminates unwanted asymmetric modes and allows for direct extraction of the propagation constant from S-parameters.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Engineering, Electrical & Electronic
Reza Yazdani, Hadi Aliakbarian, Amir Sahraei, Guy A. E. Vandenbosch
Summary: This study presents a novel high-efficiency shared-aperture triple-band dipole array antenna configuration for base station applications, which can achieve stable radiation patterns. Experimental results confirm the stable radiation patterns and impedance bandwidths across three frequency bands, making it a promising candidate for future 5G developments.
IET MICROWAVES ANTENNAS & PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Amir Sahraei, Hadi Aliakbarian, Reza Yazdani
Summary: In this study, a broadband dipole antenna and an integrated cavity section were introduced to increase the antenna's bandwidth. The antenna has a simple mechanical structure and can be easily fabricated. The proposed cavity section can significantly increase the antenna's bandwidth up to 100%, while maintaining a stable radiation pattern throughout the bandwidth.
IET MICROWAVES ANTENNAS & PROPAGATION
(2022)
Article
Computer Science, Information Systems
Abolfazl Azari, Anja Skrivervik, Hadi Aliakbarian, Ramezan Ali Sadeghzadeh
Summary: In this paper, a miniaturized gain-enhanced Vivaldi antenna element is designed, simulated, and successfully measured for 5G mmWave applications. The size of the antenna is compact, measuring only 5.5mm x 12mm. The operational bandwidth of the antenna element is between 22.5 - 45 GHz, covering 5G n257, n258, n259, n260, and n261 frequency bands.
Article
Engineering, Electrical & Electronic
Abolfazl Azari, Anja Skrivervik, Hadi Aliakbarian
Summary: This study proposes a microstrip termination load based on a printed monopole antenna and an absorber sheet, which achieves excellent matched termination characteristics in the frequency range of 20 to 67 GHz. The design is compact, cost-effective, and suitable for integration in RF circuits and MMICs.
ELECTRONICS LETTERS
(2023)
Article
Computer Science, Information Systems
Arezoo Abdi, Farhad Ghorbani, Hadi Aliakbarian, Tan Kim Geok, Sharul K. Abdul Rahim, Ping Jack Soh
Article
Engineering, Biomedical
Arezoo Abdi, Hadi Aliakbarian
IEEE JOURNAL OF TRANSLATIONAL ENGINEERING IN HEALTH AND MEDICINE
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Zahra Kazerouni, Hadi Aliakbarian
2017 INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY - EMC EUROPE
(2017)
