Electromagnetic Science最新文献_第4页

The Spectral Integral Method (SIM) for the Scattering from an Arbitrary Number of Circular PEC Cylinders 光谱积分法 (SIM) 用于任意数量的圆形 PEC 圆柱散射

Electromagnetic Science Pub Date : 2023-12-01 DOI: 10.23919/emsci.2023.0026

Qing Huo Liu;Siwei Wan;Chunhui Zhu

引用次数: 0

Tailoring Meta-Liquid Crystal for Larger Tunability 定制元液晶，实现更大的可调性

Electromagnetic Science Pub Date : 2023-12-01 DOI: 10.23919/emsci.2023.0019

Jun Shu;Yueping Zhang

{"title":"Tailoring Meta-Liquid Crystal for Larger Tunability","authors":"Jun Shu;Yueping Zhang","doi":"10.23919/emsci.2023.0019","DOIUrl":"https://doi.org/10.23919/emsci.2023.0019","url":null,"abstract":"Liquid crystals are pivotal innovations in the field of tunable materials. However, in the millimeter wave band, the relatively low tunability of liquid crystal limits its applicability. A design method utilizing metamaterial characteristics to enhance the tunability of a liquid crystal is proposed. This design method is based on two theoretical models. Both models embed metamaterial structures into a liquid crystal, thus tailoring a new tunable material, namely, a meta-liquid crystal. By appropriately designing the metamaterials to meet the corresponding conditions derived in different models, the tunability of the meta-liquid crystal can be higher than that of the original liquid crystal. An application of beam scanning is provided to verify this method. Two beam steerable antenna arrays are designed, fabricated and investigated. The beam scanning range of the meta-liquid crystal antenna array is much wider than that of the original liquid crystal antenna array, which confirms the enhancement of tunability. Consequently, this work fills the research gap in improving the performance of liquid crystals in the millimeter wave band. Simultaneously, a bridge is established between two significant materials: tunable materials and metamaterials. The results imply that the performance of tunable materials can be manipulated by metamaterials.","PeriodicalId":100402,"journal":{"name":"Electromagnetic Science","volume":"1 4","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10433581","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139731969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reconfigurable Metasurface: A Systematic Categorization and Recent Advances 可重构元表面：系统分类和最新进展

Electromagnetic Science Pub Date : 2023-12-01 DOI: 10.23919/emsci.2023.0002

Changhao Liu;Fan Yang;Shenheng Xu;Maokun Li

引用次数: 0

Switchable Electromagnetic Absorber/Reflectors Using Back-Loaded Active Radio Frequency Circuits 使用背负式有源射频电路的可切换电磁吸收器/反射器

Electromagnetic Science Pub Date : 2023-12-01 DOI: 10.23919/emsci.2023.0030

Bing Wang;Wen Wu;Zhi-Yuan Zong;Guoxiao Cheng;Song-Zhao Zhou;Da-Gang Fang

{"title":"Switchable Electromagnetic Absorber/Reflectors Using Back-Loaded Active Radio Frequency Circuits","authors":"Bing Wang;Wen Wu;Zhi-Yuan Zong;Guoxiao Cheng;Song-Zhao Zhou;Da-Gang Fang","doi":"10.23919/emsci.2023.0030","DOIUrl":"https://doi.org/10.23919/emsci.2023.0030","url":null,"abstract":"In this paper, three switchable electromagnetic absorbers/reflectors using back-loaded active radio frequency circuits are presented. In the first design, the incident waves are received by an antenna array, transmitted to the back-loaded active circuits and then reflected into the free space when the PIN diode in series in the circuit is off. When the diode is on, the incident waves can be absorbed by a matching load. In the second design, the phase of the reflected waves in the unit cell can be manipulated by adjusting the length of the microstrip lines, allowing the reflection polarization to be tuned. In the third design, by integrating RF switching chips into the back-loaded circuits, a switchable absorber/reflector with a switching polarization state is presented. The first design is fabricated and measured. The profile of the switchable absorber/reflector is approximately \u0000<tex>$0.14lambda_{l}$</tex>\u0000. A total of 2 PIN diodes are used per unit cell for both TE and TM polarizations. By using active circuits, flat in-band reflection performance and stable absorption performance can be achieved in the frequency band of 7 to 18.5 GHz (FBW of 90%) for normal incidence, and an angular stability of 45° for TE and TM polarizations is realized.","PeriodicalId":100402,"journal":{"name":"Electromagnetic Science","volume":"1 4","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10433552","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139732017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Electromagnetic Perspective of Artificial Intelligence Neuromorphic Chips 人工智能神经形态芯片的电磁视角

Electromagnetic Science Pub Date : 2023-09-01 DOI: 10.23919/emsci.2023.0015

Er-Ping Li;Hanzhi Ma;Manareldeen Ahmed;Tuomin Tao;Zheming Gu;Mufeng Chen;Quankun Chen;Da Li;Wenchao Chen

{"title":"An Electromagnetic Perspective of Artificial Intelligence Neuromorphic Chips","authors":"Er-Ping Li;Hanzhi Ma;Manareldeen Ahmed;Tuomin Tao;Zheming Gu;Mufeng Chen;Quankun Chen;Da Li;Wenchao Chen","doi":"10.23919/emsci.2023.0015","DOIUrl":"https://doi.org/10.23919/emsci.2023.0015","url":null,"abstract":"The emergence of artificial intelligence has represented great potential in solving a wide range of complex problems. However, traditional general-purpose chips based on von Neumann architectures face the “memory wall” problem when applied in artificial intelligence applications. Based on the efficiency of the human brain, many intelligent neuromorphic chips have been proposed to emulate its working mechanism and neuron-synapse structure. With the emergence of spiking-based neuromorphic chips, the computation and energy efficiency of such devices could be enhanced by integrating a variety of features inspired by the biological brain. Aligning with the rapid development of neuromorphic chips, it is of great importance to quickly initiate the investigation of the electromagnetic interference and signal integrity issues related to neuromorphic chips for both CMOS-based and memristor-based artificial intelligence integrated circuits. Here, this paper provides a review of neuromorphic circuit design and algorithms in terms of electromagnetic issues and opportunities with a focus on signal integrity issues, modeling, and optimization. Moreover, the heterogeneous structures of neuromorphic circuits and other circuits, such as memory arrays and sensors using different integration technologies, are also reviewed, and locations where signal integrity might be compromised are discussed. Finally, we provide future trends in electromagnetic interference and signal integrity and outline prospects for upcoming neuromorphic devices.","PeriodicalId":100402,"journal":{"name":"Electromagnetic Science","volume":"1 3","pages":"1-18"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10332442","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138454430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electromagnetic Wave Tailoring: From One Dimension to Multiple Dimensions 电磁波裁剪:从一维到多维

Electromagnetic Science Pub Date : 2023-09-01 DOI: 10.23919/emsci.2023.0013

Jing Cheng Zhang;Geng-Bo Wu;Mu Ku Chen;Xiaoyu Che;Yao Liang;Din Ping Tsai;Chi Hou Chan

{"title":"Electromagnetic Wave Tailoring: From One Dimension to Multiple Dimensions","authors":"Jing Cheng Zhang;Geng-Bo Wu;Mu Ku Chen;Xiaoyu Che;Yao Liang;Din Ping Tsai;Chi Hou Chan","doi":"10.23919/emsci.2023.0013","DOIUrl":"https://doi.org/10.23919/emsci.2023.0013","url":null,"abstract":"Metasurfaces, known as arrays of subwavelength antennas, provide a wide range of options for controlling electromagnetic waves and effectively reducing the size and complexity of electromagnetic devices. Metasurfaces can manipulate five degrees of freedom of electromagnetic waves: amplitude, wavelength, polarization, phase, and orbital angular momentum; these are customized to provide a variety of remarkable functionalities, including metalenses and meta-holograms. With the advancement of simultaneously manipulating two or more degrees of freedom of the electromagnetic field, there has been a significant increase in the amount of information that electromagnetic waves can carry. The wavefront can be precisely tailored for specific applications, facilitating new possibilities for innovative applications with high performance and diverse functionalities, such as full-color vectorial meta-holograms achieved by a single-layer metasurface. This review briefly overviews the latest developments in metasurfaces, categorizing them based on their various degrees of freedom used to manipulate the electromagnetic waves. The use of metasurfaces to control electromagnetic waves from one dimension to multiple dimensions is systematically explored. The challenges and opportunities for future research are discussed.","PeriodicalId":100402,"journal":{"name":"Electromagnetic Science","volume":"1 3","pages":"1-21"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10332208","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138454415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Regulation and Control of Electromagnetic Field in Radio-Frequency Circuits and Systems 射频电路与系统中电磁场的调节与控制

Electromagnetic Science Pub Date : 2023-09-01 DOI: 10.23919/emsci.2022.0010

Kaixue Ma

{"title":"Regulation and Control of Electromagnetic Field in Radio-Frequency Circuits and Systems","authors":"Kaixue Ma","doi":"10.23919/emsci.2022.0010","DOIUrl":"https://doi.org/10.23919/emsci.2022.0010","url":null,"abstract":"Since the first demonstrations of radio-frequency (RF) circuits, the physics of the electromagnetic (EM) field and its regulation and control with codesigned circuits, have become essential competencies of RF circuit designers. Leveraging advanced regulation or control methods, numerous high-performance circuits have been developed at RF and millimeter-wave (mm-wave) frequencies. Three main methods of electromagnetic regulation have been widely utilized, namely, the separation of electric and magnetic coupling paths, the manipulation of electromagnetic energy through the coupling of multiple tanks or multiple resonators, and the regulation of electromagnetic fields in air cavities or meta-substrates. The separated coupling paths of electric and magnetic fields provide guidance for designing a high-performance filter topology with a quasielliptical response through additional zeros. The manipulation of the EM field through electrical and magnetic intercouplings of multitanks or multiresonators, such as are used in oscillators, power amplifiers (PAs), etc., results in remarkable power efficiency, size reduction, and wide bandwidth. The regulation of electromagnetism through an air cavity, patterned substrate, or metasubstrate reduces dielectric losses and size, especially when using a substrate integrated suspended line (SISL) platform. Many excellent circuits have been reported based on SISL with low loss, high integration, and self-packaging. Here, we present state-of-the-art cases that demonstrate the benefits of EM field regulation and control.","PeriodicalId":100402,"journal":{"name":"Electromagnetic Science","volume":"1 3","pages":"1-28"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10332444","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138454414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electromagnetic Technology for Vacuum Metrology in the Typical Development of a Metrological-Grade Spinning Rotor Gauge 电磁真空计量技术在计量级旋转转子压力表典型研制中的应用

Electromagnetic Science Pub Date : 2023-09-01 DOI: 10.23919/emsci.2023.0006

Detian Li;Meiru Guo;Zhenhua Xi;Huzhong Zhang;Bowen Li

引用次数: 0

Aperture-Shared Radiation Surface: A Promising Technique for Multifunctional Antenna Array Development 孔径共享辐射面:多功能天线阵列发展的一种有前途的技术

Electromagnetic Science Pub Date : 2023-09-01 DOI: 10.23919/emsci.2023.0008

Amirhossein Askarian;Ke Wu

引用次数: 1

Low-Cost Beam Steering that Covers the Entire Azimuthal Plane Powered by Amplitude-Only Synthesis of a Quintuple-Dipole Source 覆盖整个方位角平面的低成本光束控制，由五元偶极子源的纯振幅合成提供动力

Electromagnetic Science Pub Date : 2023-09-01 DOI: 10.23919/emsci.2023.0020

Da Yi;Zhiyang Qi;Mingchun Tang;Dajiang Li;Yilin Lang;Xingchang Wei

{"title":"Low-Cost Beam Steering that Covers the Entire Azimuthal Plane Powered by Amplitude-Only Synthesis of a Quintuple-Dipole Source","authors":"Da Yi;Zhiyang Qi;Mingchun Tang;Dajiang Li;Yilin Lang;Xingchang Wei","doi":"10.23919/emsci.2023.0020","DOIUrl":"https://doi.org/10.23919/emsci.2023.0020","url":null,"abstract":"A new amplitude-only synthesis approach in quintuple electric dipoles (EDs) is proposed to enable the regulation of power flow in the azimuthal plane. The regulation methodology is investigated analytically with double ED, triple ED and quintuple ED models. First, when the phase difference between the EDs switches, the double ED model, acting as a reconfigurable source, can work in two modes with different power flow directions, i.e., unidirectional mode and bidirectional mode. Then, from the triple ED model, it is verified that the power flow in the two working modes can be regulated to the desired direction in the azimuthal plane with high precision by controlling the feeding amplitudes of the dipoles. Moreover, a quintuple ED model is developed to enhance the symmetry and consistency of the power flow regulation in the plane. Finally, a prototype of the azimuthal beam steering system, including digitally controlled radio-frequency (RF) frontend tuning circuits, optimized practical feeding elements, and an end-fire radiator, is designed, fabricated and measured. Both unidirectional and bidirectional modes are observed, and satisfactory single-beam and dual-beam steering performance in the azimuthal plane is achieved. Unlike most phased arrays that realize beam steering by configuring phases, the beam steering of the proposed reconfigurable source in each mode can be arbitrarily synthesized only by the amplitudes of the quintuple feeding elements, which provides a new route for realizing low-cost and multifunctional beam-steering systems.","PeriodicalId":100402,"journal":{"name":"Electromagnetic Science","volume":"1 3","pages":"1-14"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10332445","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138454416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0