Article
Engineering, Electrical & Electronic
Miao Wang, Xiuwen Tian, Lizhong Song
Summary: The paper introduces an ultra wideband dual polarization antenna with high polarization isolation for passive radar system. The design combines a modified Vivaldi antenna and a folded dipole log periodic antenna to achieve high polarization isolation. Experimental testing and analysis validate the effectiveness of the antenna for applications in anti radiation missile guidance radar and electronic reconnaissance.
Article
Chemistry, Multidisciplinary
Jianchun Xu, Zhao Li, Xuchao Pan, Xi Wen, Jinqing Cao, Wen Gong, Shaolong Yang, Ming Lei, Fangzhou Yao, Ke Bi
Summary: Mechanical antennas based on piezoelectric materials can significantly reduce the size of long wave antennas and improve communication capacity. However, their narrow bandwidth and weak field intensity limit their practical applications. A mechanical antenna based on PMN-PT is proposed to address these limitations and exhibits ultra-wideband characteristics and excellent communication properties.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Chengwei Zhao, Yanping Bai, Qiang Wei
Summary: This paper presents a novel all-metal Vivaldi antenna design with a simple structure and convenient machining, achieving wide impedance bandwidth, stable gain, and symmetric radiation pattern over the frequency range 2-50 GHz.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2022)
Article
Computer Science, Information Systems
Sarmad Nozad Mahmood, Asnor Juraiza Ishak, Ali Jalal, Tale Saeidi, Suhaidi Shafie, Azura Che Soh, Muhammad Ali Imran, Qammer H. Abbasi
Summary: This paper introduces a miniaturized, dual-polarized, multiple input-multiple output (MIMO) wearable antenna, which uses leaf-shaped and tree-shaped antennas, and improves antenna performance by loading stubs, parasitic spiral, and shorting pins. Through near-field microwave imaging experiments, the antenna's high fidelity and accurate localization in breast imaging were verified.
Article
Engineering, Electrical & Electronic
Jingjing Wang, Jianwei Liu, Kangming Hou, Yongcheng Li
Summary: A novel antipodal Vivaldi antenna with enhanced gain and directivity is proposed in this paper. The substrate of the antenna is innovated to a combination of circular-shaped and rectangular-shaped. To enhance the gain, a fan-shaped expansion structure is loaded along the opening of the patch, and several directors are loaded in the vertical direction of the substrate to enhance the directivity. The results show that the proposed antenna has a reflection coefficient below -12 dB in the frequency range of 3 to 10 GHz, and the peak gain is higher than 8 dBi after 6 GHz.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
Article
Chemistry, Analytical
Ruiyue Hu, Feng Zhang, Shengbo Ye, Guangyou Fang
Summary: In this paper, an ultra-wideband and high-gain Vivaldi antenna with artificial electromagnetic material is proposed for ground-penetrating radar systems. The antenna utilizes directors loaded inside the antenna gradient slot and an artificial electromagnetic material composed of H-shaped units to improve gain and radiation directivity. Experimental results show that the antenna has good impedance matching and a maximum realized gain of 15.2 dBi.
Article
Engineering, Electrical & Electronic
Shaopeng Pan, Wanting Shen, Yang Feng, Zhu Liu, Pei Xiao, Gaosheng Li
Summary: In this study, the operating bandwidth of the Vivaldi antenna was enhanced by designing gradient elliptical slots and integrating an ultra-wideband metasurface lens. The proposed design successfully achieved both a wider bandwidth and improved performance of the antenna, while also achieving miniaturization.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Yiping Shi, Hanqing Qiao, Xiaojun Zou, Dongxiao Zhang, Deng Jiang, Tuopu Qu, Guangming Wang
Summary: A novel structure based on ultra-wideband (UWB) filtering circuit for isolation enhancement of Vivaldi antenna with narrow gap in H-plane is proposed. The proposed decoupling structure shows good isolation performance in a specific frequency range without affecting the radiation performance. This structure has potential applications in large-scale UWB arrays.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
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
Zhe Zhang, Mingyu Sun, Xuedong Fu, Kang An, Aixin Chen
Summary: The proposed wideband quad-polarization-agility antenna uses phase-reconfigurable baluns to achieve phase shifting and folded dipoles to generate multiple polarization modes, thus broadening the impedance bandwidth. The antenna radiates a stable pattern within the frequency band with low cross-polarization levels and good agreement between experimental and simulated results.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2021)
Article
Computer Science, Interdisciplinary Applications
Lin Xiao, Shi-Wei Qu, Shiwen Yang
Summary: This paper presents the implementation of an ultra-wideband (UWB) dual-polarized transmitarray antenna (TA) which combines the UWB performance of Vivaldi array and the true-time-delay (TTD) characteristic of transmission line to overcome bandwidth limitations. By designing a dual-polarized TA element with low transmission losses, high polarization purity, and linear TTD phase responses, and addressing in-band resonances caused by wire grid ground, a stable radiation performance TA prototype is manufactured.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Hoyun Won, Yang-Ki Hong, Minyeong Choi, Woncheol Lee, Drew Taylor, Changhyun Chung, Joohan Lee
Summary: This paper presents a novel high-gain, miniaturized, and ultra-wideband tapered-slot Vivaldi antenna (TSVA) for ice-sounding radar applications. The antenna is miniaturized and its impedance matching and gain are improved by introducing new designs of tapered slot edge, circular cavity, rectangular cavity, inner circular patch, and rectangular slit structures. Simulation and measurement results show that the designed Vivaldi antenna has a 15% reduction in size and a peak realized gain increase of up to 5.1 dBi compared to the conventional antenna.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Jinjing Ren, Hezhihan Fan, Qi Tang, Zhongyuan Yu, Yang Xiao, Xiang Zhou
Summary: This article proposes a miniaturized and easily fabricated ultra-wideband (UWB) antenna system that improves the positioning capability of detection systems by enlarging the beam width of the transmitting antenna and reducing the beam width of the receiving antenna. The designed antennas feature stable radiation patterns and wideband impedance matching in the frequency range between 2.5 GHz and 4 GHz.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Electrical & Electronic
Xiaoyu Liu, Yongzhong Zhu, Wenxuan Xie
Summary: This letter presents the design of a compact broadband circularly polarized (CP) array antenna using the Vivaldi element. The antenna consists of four sequentially rotated Vivaldi antenna elements bent into the aperture for miniaturization. A coupling metal patch on the top enhances impedance, circular polarization, and gain characteristics. The measured results show a 10 dB impedance bandwidth of 57.8% and a 3 dB axial ratio bandwidth of 50.7%. The antenna also has a peak gain of 5.6 dBic across the entire operating bandwidth, making it highly miniaturized compared to similar antennas.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Wanli Li, Jun Lei, Weiwen Li
Summary: In a Vivaldi antenna, a symmetrical double-sided structure is introduced to reduce the lower-side frequency. Multiple transverse and longitudinal slots loaded into the redundant conductor layer of the Vivaldi structure can stimulate resonant modes at the higher frequency end, further broadening the antenna bandwidth towards high frequencies. Meanwhile, impedance matching slots are introduced into the conductor layer on the feed side to achieve ultra-wideband (UWB) antenna. The overall size of the final antenna is 23.5 mm x 30.0 mm x 2.4 mm, while the relative bandwidth (S-11 < -10 dB) reaches 142% (2.49-14.78 GHz). This miniaturized UWB antenna has similar directional patterns in the operating band, with an average gain of 4.82 dB.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Shiyan Wang, Lei Zhu, Yin Li, Gang Zhang, Jiquan Yang, Jianpeng Wang, Wen Wu
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2020)
Article
Engineering, Electrical & Electronic
Shiyan Wang, Lei Zhu, Gang Zhang, Jiquan Yang, Jianpeng Wang, Wen Wu
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2020)
Article
Engineering, Electrical & Electronic
Gang Zhang, Xinde Zhang, Zhenyao Qian, Jiquan Yang
IET MICROWAVES ANTENNAS & PROPAGATION
(2020)
Article
Engineering, Electrical & Electronic
Gang Zhang, Shicheng Liu, Wang Chen, Zhuowei Zhang, Jiquan Yang
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2020)
Article
Engineering, Electrical & Electronic
Yijing Deng, Yu Shi, Patrick Fay, Lei Liu
Summary: By virtually generating different filter patterns using photogenerated free carriers in a semiconducting mesa-array structure, this novel approach achieves superior tunability and reconfigurability for terahertz mesh filters. Reconfigurable bandpass filters operating in the frequency range of 108-489 GHz with insertion losses of 0.82-1.13 dB can be achieved using silicon mesa arrays with 50 x 50 µm² unit cells.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2021)
Article
Optics
Yu Shi, Yijing Deng, Jun Ren, Peizhao Li, Patrick Fay, Lei Liu
Summary: Optically controlled RF switches with a novel non-contact device architecture that utilizes the change in conductivity in semiconductors caused by photogenerated carriers show high performance in the millimeterwave-to-terahertz region. Modeling and simulation of G-band coplanar waveguide-based optical switches using different contact geometries and active materials such as Si and Ge demonstrate superior performance compared to traditional solid-state switches and phase-change material-based switches. These proposed switches have potential for developing novel tunable and reconfigurable circuits for advanced sensing, imaging, and communication applications.
Article
Chemistry, Multidisciplinary
Peizhao Li, Yu Shi, Yijing Deng, Lei Liu
Summary: This paper reports the design, simulation, and analysis of a THz phased array using lens-coupled annular-slot antennas (ASAs) for wireless communications beyond 5G or 6G. The use of an extended hemispherical silicon lens enables higher antenna gain and efficiency. The results show the potential of this design approach for future wireless communication technologies.
APPLIED SCIENCES-BASEL
(2022)
Article
Optics
Ahasan Ullah, Yi-Chieh Wang, Sanjida Yeasmin, Yijing Deng, Jun Ren, Yu Shi, Lei Liu, Li-Jing Cheng
Summary: This paper presents a novel photoinduced reconfigurable metasurface for high spatial resolution terahertz (THz) wave modulation. The metasurface overcomes the limitation of lateral diffusion and ensures conductivity, creating high-definition photoconductive patterns with excellent modulation depth and tunable central frequency. It bears important implications for the implementation of reconfigurable THz devices.
Article
Engineering, Electrical & Electronic
Yu Shi, Yijing Deng, Peizhao Li, Patrick Fay, Lei Liu
Summary: This paper reports the design, fabrication, and prototype demonstration of a 200-GHz polarization-resolved quasi-optical detector. The detector achieves polarization resolution by integrating it orthogonally with a dual-polarization annular-slot antenna. Experimental characterization shows good agreement with theoretical calculations, and the detector is demonstrated to have polarization imaging capability when used as an imaging system.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Peizhao Li, Yu Shi, Yijing Deng, Patrick Fay, Lei Liu
Summary: The researchers propose a novel approach to design tunable and reconfigurable bandstop filters using bias-free optically-controlled RF switching elements. The effectiveness of this method is verified by designing a bandstop filter with two stopbands centered at 4.05 and 4.75 GHz. The filters can be tuned and reconfigured by selectively illuminating the embedded silicon chips with fiber-coupled laser diodes, and the suppression of each stopband can be continuously and independently adjusted by changing the light intensity.
ELECTRONICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Yijing Deng, Yu Shi, Peizhao Li, Patrick Fay, Li-Jing Cheng, Lei Liu
Summary: A novel approach for high-resolution terahertz imaging using photoinduced coded-apertures on micromachined mesa-array structures is reported. Experimental results demonstrate that the approach can achieve high modulation depth and subwavelength spatial resolution.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Yu Shi, Yijing Deng, Peizhao Li, Patrick Fay, Lei Liu
Summary: A fully integrated lens-coupled dual-polarization detector for imaging in the terahertz region was designed, fabricated, and characterized. The detector module can simultaneously measure the two orthogonal linear-polarized components of the incident THz waves, and polarization-resolved imaging of Gaussian beam and birefringent samples was performed. The single-pixel detector demonstrated here is suitable for array applications and has significant impact on remote sensing, through-barrier imaging, and detection/identification applications.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Yijing Deng, Yu Shi, Peizhao Li, Patrick Fay, Lei Liu
Summary: A novel approach for subwavelength terahertz imaging using mesa-array structures with photo-induced coded apertures was proposed, successfully achieving high-resolution imaging with modulation depth of approximately 20 dB. Prototype imaging demonstrations showed imaging resolution of around 438 μm at 740 GHz, indicating promising extension to high-performance THz imaging systems.
2021 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM (IMS)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Peizhao Li, Yu Shi, Yijing Deng, Lei Liu
Summary: The study presents the design and simulation of a THz switchable beam-steering phased array using lens-coupled annular-slot antennas, which shows great potential for advanced THz imaging and communication applications. Simulation results demonstrate that five different beam angles can be achieved with an antenna gain of around 15 dB, highlighting the efficiency and versatility of the design for various THz applications.
2021 46TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES (IRMMW-THZ)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Yijing Deng, Yu Shi, Lei Liu
2020 45TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)
(2020)
