Article
Engineering, Electrical & Electronic
Wei Hu, Qiaosong Li, Hao Wu, Zhan Chen, Lehu Wen, Wen Jiang, Steven Gao
Summary: This paper presents a novel decoupling method for designing a dual-band closely arranged MIMO antenna pair with high isolation for 5G smartphones. By combining a bent loop and a T-shaped monopole into a compact space, multiple in-phase and out-of-phase modes are excited at two different bands to reduce mutual coupling. The proposed antenna pair achieves high isolation of over 24 dB without additional decoupling structures. An 8 x 8 MIMO system is developed using four such antenna pairs, operating at 3.3-3.6 GHz and 4.4-5.0 GHz, with isolation exceeding 12.8 dB, low envelope correlation coefficients (ECCs) below 0.18, and efficiencies above 71% and 68% in the respective bands. This MIMO system features dual-band operation, compact structure, and excellent isolation, providing a promising solution for 5G smartphone antenna design.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Jin Jiang, Qing-Xin Chu
Summary: This article proposes a new concept of broadband decoupling using multiple decoupling nulls to mitigate the mutual coupling problem in antenna arrays. The introduction of multiple resonators allows for broadband decoupling within the operating frequency band of the antenna. The article also elucidates the design method of the decoupling structure in the antenna array, providing significant computational resource savings. Simulation and test results demonstrate the effectiveness and high potential of this method for application to 5G MIMO antenna arrays deployed in base stations and wireless routers.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Bingying Li, Xing Zhao, Qishen Huang, Minghao Hu, Xinyu Zhu, Haoming Ying
Summary: This paper presents a dual-band MIMO antenna pair for 5G cell phones. By adding capacitors to form a resonant network, dual-band performance is achieved. A neutralization line is used to improve isolation in the high band. The antenna pair is small, operates at 3.5 and 4.85 GHz, and has good isolations. It is a good choice for 5G terminals.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Wen-Feng Zeng, Fu-Chang Chen, Qing-Xin Chu
Summary: This paper presents a bandwidth-enhanced antenna pair with a tunable electric field (E-field) null for 5G mobile phone application. The proposed antenna pair consists of a stub-loaded inverted-F antenna (IFA) and a simple feeding network. The IFA can achieve a wider impedance bandwidth and the feeding network is designed to excite the orthogonal dipole mode and adjust the E-field null position. By adjusting the phase shifter, the E-field null can be moved to the feeding position, resulting in excellent isolation performance. A simulated sub-6 GHz antenna pair shows isolation of over 16.5 dB within the N78 band. A 8 x 8 MIMO system is designed and measured, achieving isolation of over 19.5 dB and low envelope correlation coefficients (ECCs). The proposed antenna provides a novel decoupling strategy for wider bandwidth while maintaining isolation performance and compact size based on orthogonal mode.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Changjiang Deng, Xiaowei Cao, Donghao Li, Weihua Yu
Summary: This paper presents a compact dual-band multiple-input-multiple-output antenna for fifth-generation mobile terminal applications. The antenna consists of four pairs, each including two tightly arranged monopoles. By folding the L-shaped monopoles into U-shaped structures, both the 3.5 GHz band and 4.9 GHz band can share the same decoupling inductor. Addition of stop-band filters enables dual-band operation with a single branch. The size of the antenna pair is only 19 x 4 mm(2), and it has a measured -6 dB bandwidth covering 3.4-3.6 GHz and 4.8-5.0 GHz, with port isolation higher than 12 dB. The measured radiation efficiency ranges from 41% to 59% in the lower band and from 38% to 62% in the upper band.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Libin Sun, Yue Li, Zhijun Zhang
Summary: This paper proposes a wideband decoupling technique for a wideband integrated slot antenna pair for fifth-generation (5G) metal-rimmed smartphones. By inserting a connecting line between two closely spaced open-slot antennas, the proposed solution not only achieves decoupling but also improves bandwidth.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Mingzhe Hu, Yue Li
Summary: This paper proposes a wideband and low-profile microstrip antenna for MIMO applications, which simultaneously excites three modes to achieve wideband radiation. The proposed antenna has a compact size and low profile, making it suitable for 5G mobile MIMO applications.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Computer Science, Interdisciplinary Applications
Haoyu Zhu, Xuehui Guan, Baoping Ren, Chuanyun Wang
Summary: This paper presents an eight-element dual-band MIMO antenna for fifth-generation smartphones, with optimized isolation achieved through loaded short-circuited stubs on the feedline of slot antennas. Experimental results show a good agreement between simulation and measurement.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2021)
Article
Computer Science, Information Systems
Daniele Pinchera, Mario Lucido, Gaetano Chirico, Fulvio Schettino, Marco Donald Migliore
Summary: This paper proposes the use of a controllable local propagation environment to enhance the capability of wireless propagation channels in beyond-5G systems. The authors analyze its positive effect on the multiplexing capability of massive MIMO systems and show through numerical simulations that the proposed system outperforms its non-reconfigurable counterpart in terms of the number of contemporary connected users. Furthermore, the optimized system ensures higher channel fairness by substantially increasing the minimum received power by the terminals.
Article
Engineering, Electrical & Electronic
H. Singh, D. V. S. Prasad, S. Tripathi
Summary: This article presents a compact, tightly-coupled, self-decoupled MIMO antenna pair for 5G systems, which achieves low mutual coupling by modifying the shapes of the antenna elements and tuning their hybrid effect. The proposed design structure offers dual-band self-decoupling features and demonstrates good performance in the 5G NR and LTE frequency bands.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2022)
Article
Engineering, Electrical & Electronic
Min Li, Singwai Cheung
Summary: This paper introduces a novel parasitic decoupling technique to significantly improve antenna isolation in array systems, with validation through simulations and measurements.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Saou-Wen Su, Peng-Hao Juan, Fa-Shian Chang
Summary: A low-profile, conjoined and yet decoupled two-monopole design for Wi-Fi 6E notebook applications is presented, which achieves acceptable isolation and low envelope correlation coefficient through proper arrangement and loading of inductors.
INTERNATIONAL JOURNAL OF ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Feng Liu, Jiayin Guo, Luyu Zhao, Guan-Long Huang, Yingsong Li, Yingzeng Yin
Summary: The study introduces a ceramic superstrate-based decoupling method that effectively reduces mutual coupling between closely packed dipole antennas while maintaining good performance. By introducing the ceramic superstrate, the isolation between antennas is significantly improved, with stable antenna performance and increased gain.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Tianqi Pei, Lei Zhu, Jianpeng Wang, Wen Wu
Summary: This article introduces a new low-profile decoupling structure for patch antenna arrays based on the phase shift concept. Through analysis and demonstration, it is proven to effectively enhance isolation between antenna elements and suppress mutual coupling.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Lei Ge, Huawei Lin, Yuan Ji, Kam-Weng Tam, Yue Zhao
Summary: Self-decoupling coupled-fed patch antennas are designed, which achieve high isolation between elements without additional decoupling structures based on a weak-field region formed by the T-shaped probe feed and the radiating patch. Dual-element antenna array and four-element MIMO linear antenna array are built to validate the decoupling mechanism, obtaining better than 30 dB isolation over the impedance band of 3.3-3.66 GHz and demonstrating the suitability for 5G MIMO applications.
ELECTRONICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Zhongyao Cao, Yue Li, Zhijun Zhang, Magdy F. Iskander
Summary: This article proposes a mechanically reconfigurable 1-D reflectarray that is actuated by a single motor. The reflectarray consists of metal tubes lifted by ejectors, and utilizes the discontinuity of the Archimedean spiral to achieve continuous phase growth. A novel drive mechanism, consisting of Archimedean spiral cams and followers, is designed to convert the motor rotation to linear motion of the elements. The reflectarray, supported by low-cost acrylic plates, achieved a beam steering range of -60 degrees to 60 degrees in one dimension at 5 GHz and showed a significant improvement in the received signal level in a multipath environment.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Weiquan Zhang, Yue Li, Kunpeng Wei, Zhijun Zhang
Summary: This paper presents two dual-band back-to-back planar inverted-F antennas (PIFAs) for WLAN applications, which can simultaneously radiate at the 2.4 GHz and 5 GHz bands by etching a slot on the PIFA. A decoupling process using long and short slots on the ground is discussed to reduce mutual coupling. The fabricated and measured antennas show good coverage of the 2.4 and 5 GHz WLAN bands with isolation improved to higher than 20 dB at both bands.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Optics
Wendi Yan, Ziheng Zhou, Hao Li, Wangyu Sun, Qihao Lv, Yue Li
Summary: Different from classical periodic-resonator-based metamaterials, epsilon-near-zero (ENZ) metamaterials achieve equivalent electromagnetic characteristics in deep subwavelength scales. By substituting dielectric dopants with metal-layer dopants, a dielectric-free approach is used to construct a low-loss resonant cavity, enabling the largest tuning range of the effective permeability mu(eff). The low-loss benefits of layer-type ENZ metamaterials are demonstrated in integrated microfluidic switches and high-sensitivity sensors, showing universal significance for wide-range applications in extreme-small-volume devices and systems.
LASER & PHOTONICS REVIEWS
(2023)
Article
Engineering, Electrical & Electronic
Xiaopeng Zhang, Dawei Zhou, Shichao Li, Yue Li, Kunpeng Wei, Zhijun Zhang
Summary: A high-gain, broadband, and +/- 45 degrees polarized patch antenna array for Wi-Fi 6/6E application with a simple configuration is proposed. The antenna is composed of a substrate board and a metal layer, with all patches and feeding circuits printed on the bottom surface of the board. T-shaped dipoles driven by parallel dual lines are used to excite the patches, and their parameters are designed to achieve broadband coverage of both 5 and 6 GHz bands of Wi-Fi 6/6E. A prototype is fabricated and tested, showing measured bandwidth and gains in agreement with simulated results. The proposed antenna offers advantages in high gain, low cost, and easy processing compared to other unidirectional antennas.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Weihao Diao, Yue Li, Zhijun Zhang
Summary: In this paper, an antenna design for unmanned aerial vehicles with a null-filled axisymmetric secant-square-shaped beam is proposed. The antenna consists of four monopoles with sequentially rotated feed and a coupling-fed grooved circular patch. The radiation power ratio is utilized for beam shaping, and the ground effect is also examined. A prototype is manufactured to validate the proposed method and antenna performance. The gain curves of the antenna align well with the secant-squared curve in the 0 to 60 degree range, with an RMSE below 1.35 dB at 5.5-5.7 GHz.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Weiquan Zhang, Yue Li, Kunpeng Wei, Zhijun Zhang
Summary: This article presents a compact multiple-input-multiple-output (MIMO) microstrip antenna system that covers the 2.4 and 5 GHz wireless local area network (WLAN) bands. The dual-band characteristics are achieved by exciting the TM01 and TM03 modes of a microstrip antenna, using a rectangular slot to improve the radiation capability of the TM03 mode, and utilizing two probes to tune the resonant frequency of the TM01 mode. High interport isolation at the two WLAN bands is achieved through isolation enhancement at the lower and upper-frequency bands, introducing split loops to reduce mutual coupling at the 2.4 GHz band, and adding dipole elements in the rectangular slot for high isolation at the 5 GHz band. The proposed antenna system operates at 2.25-2.63 and at 5.14-6.06 GHz, with measured maximum mutual coupling of less than -15.3 dB at both operating frequency bands.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Zhongyao Cao, Jiadong Hu, Yue Li, Kunpeng Wei, Zhijun Zhang, Magdy F. Iskander
Summary: A compact reconfigurable element-based 360 degrees azimuth scanning array is proposed for aviation applications. The reconfigurable Yagi-Uda element is constructed by combining a driven element and two switchable parasitic elements. The array can switch the radiation pattern to two broadside states in two directions and an endfire state. The measured results of the prototype indicate a wide scanning range and high gain with a small cross-sectional area. This work provides a compact reconfigurable antenna with full 360 degrees coverage for aviation applications and has the potential to promote future anti-interference array designs.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Shan Gao, Le Chang, Anxue Zhang, Yue Li, Zhijun Zhang
Summary: This article addresses the issue of exact coverage problem of unbalanced Wi-Fi 6 bands by engineering the TM0.5,0 and TM0.5,1 modes of the half-mode patch while maintaining small volume. The design guideline includes selecting proper patch size, optimizing feeding positions, and using lumped components. The proposed half-mode patch with the smallest volume among reported Wi-Fi 6 dual-band patch antennas fully covers the Wi-Fi 6 bands and suits the optimal Wi-Fi 6 RF front-end architecture.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Aofang Zhang, Kunpeng Wei, Zhijun Zhang
Summary: In this paper, a series of closely spaced self-multipath decoupled antenna pairs are proposed to achieve self-decoupling performance from a single band to four bands for 5G mobile terminals. The proposed self-multipath counteraction method allows for the counteraction of coupling energy passing through multiple coupling paths on the radiating branch of one of the antennas. By combining different types of single-band self-multipath decoupled antenna pairs, dual-band and four-band self-multipath decoupled antenna pairs are designed to achieve wider decoupling bandwidth. Simulated and measured results demonstrate excellent multiband and wideband self-decoupling performance. The proposed self-multipath counteraction method has the advantages of a simple antenna structure and wideband self-decoupling performance, making it valuable for compact and wideband MIMO systems.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Mingzhe Hu, Yue Li
Summary: This paper proposes a wideband and low-profile microstrip antenna for MIMO applications, which simultaneously excites three modes to achieve wideband radiation. The proposed antenna has a compact size and low profile, making it suitable for 5G mobile MIMO applications.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Xiaopeng Zhang, Dawei Zhou, Shichao Li, Yue Li, Zhijun Zhang
Summary: A simple approach is proposed to reshape the radiation patterns of the third mode of dipole and slot antennas by adding short parasitic strips or slots to both sides of the antennas. The reversed current or E-field in the third mode is canceled out by the induced current or E-field on the added parasitic elements, resulting in reshaped omnidirectional or bidirectional radiation patterns. The effects of parasitic element length, spacing, and position on radiation patterns have also been studied. Two prototypes with parasitic elements were fabricated and tested, validating the concept with good agreement between measured and simulated results.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Weiquan Zhang, Yue Li, Kunpeng Wei, Zhijun Zhang
Summary: A compact dual-band multibeam antenna system with high gain is proposed for MIMO Wi-Fi application. The system consists of four rotationally symmetric antenna panels and two series-fed microstrip patch antenna arrays operating at the 5GHz band. Two dual-function metasurfaces are placed between the antenna arrays to improve the gain and provide 2.4GHz antenna functionality. The antenna system demonstrates 360 degrees pattern coverage in azimuth and high gain characteristics.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Nanoscience & Nanotechnology
Xu Qin, Yijing He, Wangyu Sun, Pengyu Fu, Shuyu Wang, Ziheng Zhou, Yue Li
Summary: This study investigates the concept of stepped waveguide metamaterials as low-loss effective replicas of surface plasmon polaritons (SPPs). The proposed structure maintains the same field configuration as regular SPPs but avoids inherent losses, outperforming regular low-loss SPP designs with natural plasmonic materials in terms of propagation lengths. Furthermore, the stepped waveguide metamaterial exhibits excellent compatibility in direct interconnections with arbitrary regular SPPs, potentially leading to new SPP devices with low-loss advantages.
