2022 Photonics & Electromagnetics Research Symposium (PIERS)最新文献_第7页

Evaluation of Model Simulations of Polar Lows with Satellite Data 利用卫星资料对极地低气压模式模拟的评价

2022 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2022-04-25 DOI: 10.1109/piers55526.2022.9793158

K. Khvorostovsky, K. I. Yarusov, E. Zabolotskikh

引用次数: 0

Vortex Beam with Direction Control Based on Coding Chiral Metamirrors 基于编码的手性超镜方向控制涡旋光束

2022 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2022-04-25 DOI: 10.1109/piers55526.2022.9792937

Wenhao Li, Rui Xi, Y. Ren, Xinyu Wu, Yihao Yang, J. Huangfu, Zuojia Wang, Hongsheng Chen

引用次数: 0

Dual-electron-beams Steering Direction Tunable THz Radiation Waves at a Fixed Frequency 固定频率下双电子束导向方向可调谐太赫兹辐射波

2022 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2022-04-25 DOI: 10.1109/piers55526.2022.9792776

Daofan Wang, T. Fu, Ziquan Zhou

{"title":"Dual-electron-beams Steering Direction Tunable THz Radiation Waves at a Fixed Frequency","authors":"Daofan Wang, T. Fu, Ziquan Zhou","doi":"10.1109/piers55526.2022.9792776","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9792776","url":null,"abstract":"Terahertz (THz) waves commonly refer to the electromagnetic (EM) waves between millimeter microwaves and infrared waves. Among the three main ways of generating THz waves, vacuum electronics, especially Smith-Purcell radiation (SPR), have been considered as a popular way due to their unsubstitutability to produce relatively high emission power. SPR is a kind of electromagnetic wave radiation that happens when an energetic beam of electrons passes very closely parallel to the surface of a ruled optical diffraction grating. The frequency of radiation waves changes in the upper and lower space of the grating for different electron velocity, satisfying the SPR relationship. In this study, a Fano resonance metasurface was proposed to steer the direction of the SPR waves at the fixed resonant frequency by changing the velocity of the electric beam without varying the geometric parameters or adding extra coupling structure. The maximum emission power always locates at the resonant frequency by utilizing the integration of the Poynting vector. The absolute efficiency is normalized by the kinetic energy of the electrons. There is a great consistence of steering radiation angle about 40 degrees by altering the velocity of electron beam from 0. 6c to 0. 95c both in theoretical analysis and effective surface current simulation, where c is the speed of light in vacuum. Our study indicates that the proposed structure can produce direction-tunable THz radiation waves at resonant frequency by varying the velocity of the electric beam, which is promising for various applications in compact, tunable, high power millimeter wave and THz wave radiation sources.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126823762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Non-periodic and Conformal Antenna Arrays Design Using Parallel Evolutionary Algorithm Based on GA and PSO 基于遗传算法和粒子群算法的非周期共形天线阵列设计

2022 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2022-04-25 DOI: 10.1109/piers55526.2022.9792763

Maxim A. Dubovitskiy, M. S. Mikhailov

{"title":"Non-periodic and Conformal Antenna Arrays Design Using Parallel Evolutionary Algorithm Based on GA and PSO","authors":"Maxim A. Dubovitskiy, M. S. Mikhailov","doi":"10.1109/piers55526.2022.9792763","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9792763","url":null,"abstract":"In the theory of synthesis of MIMO antenna arrays for mm-Wave and THz applications, methods based on some a priori assumptions either about the amplitude-phase distribution over the length of the array are often used. Also the spatial location with the subsequent solution of the optimization problem is a common task in the conformal antennas design. In this paper, we analyze the possibilities of synthesizing a non-uniformly spaced array equivalent to a uniform one with a given amplitude-phase distribution. We synthesized the arrangement of elementary emitters with a known radiation pattern for the optimal antenna array by the criterion of sidelobe level suspension using two modifications of the particle swarm method and a genetic algorithm. This is implemented using evolutionary programming-real valued genetic algorithm (GA) and particle swarm optimization algorithm (PSO) under some constraints, minimizing the maximum side-lobe level of the planar array. It is shown that the proposed method can significantly reduce the pattern distortion as well as the side-lobe level. The obtained numerical results are compared with each other. The Best-Weights for 18 elements array are listed. The radiation patterns are presented for different number of elements.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127660968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Numerical Demonstrations of Beam Reconfigurable Reflective-type Opto-mechanical Metasurface 光束可重构反射型光机械超表面的数值模拟

2022 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2022-04-25 DOI: 10.1109/piers55526.2022.9793200

Yifeng Liu, Yuedan Zhou, Wenxian Zheng, Xueming Wei, Jian Li, Yongjun Huang, G. Wen

{"title":"Numerical Demonstrations of Beam Reconfigurable Reflective-type Opto-mechanical Metasurface","authors":"Yifeng Liu, Yuedan Zhou, Wenxian Zheng, Xueming Wei, Jian Li, Yongjun Huang, G. Wen","doi":"10.1109/piers55526.2022.9793200","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9793200","url":null,"abstract":"In this article, we prove a new type of opto-mechanical microwave metasurface with reflected and controllable beam through theory and simulation. The unit structure of the metasurface prepares an ELC metal resonance ring on a flexible medium FPC, and air is filled between the flexible medium FPC and the metal back plate at the bottom. Through the independent design of the cantilever arm and the air gap of each unit, the non-linear response characteristics of each unit in the metasurface are different under the excitation of electromagnetic waves of different intensities. It is based on the generalized Snell’s law to realize the abnormal deflection of the reflected beam.This research paper briefly analyzes the geometry and working mechanism of opto-mechanical metamaterials. Furthermore, the size of the cantilever arm corresponding to each unit structure is designed. Compared with the traditional nonlinear metasurface and its reconfigurable metasurface, the goal of this design is to achieve more flexible and reconfigurable functions. In addition, the electromagnetic response characteristics of each unit in the metasurface are independently controlled. Our findings will enrich the research field of nonlinear controllable metasurface technology on the coupling mechanism of electromagnetic energy and structural potential energy, which may lead to many interesting applications, such as beam scanning reflector antennas, planar devices with adjustable focal length and so on.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114892841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of G-band Extended Interaction Klystron Broadband Beam-wave Interaction g波段扩展相互作用速调管宽带波束波相互作用研究

2022 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2022-04-25 DOI: 10.1109/piers55526.2022.9792803

Longlong Yang, Wenxin Liu, Yue Ou, Zhengyuan Zhao

引用次数: 1

Off-grid DOA Estimation for Temporally Correlated Source via Robust Block-SBL in Mutual Coupling 互耦条件下时间相关源的鲁棒块sbl离网DOA估计

2022 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2022-04-25 DOI: 10.1109/piers55526.2022.9793226

Huafei Wang, Xianpeng Wang, Mengxing Huang, Xiang Lan, Liangtian Wan

{"title":"Off-grid DOA Estimation for Temporally Correlated Source via Robust Block-SBL in Mutual Coupling","authors":"Huafei Wang, Xianpeng Wang, Mengxing Huang, Xiang Lan, Liangtian Wan","doi":"10.1109/piers55526.2022.9793226","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9793226","url":null,"abstract":"In the field of array signal parameter estimation, the research on direction-of-arrival estimation (DOA) by using the sparse Bayesian learning (SBL) technique has always been a very important aspect. Most of the existing SBL-based methods are not consider the temporal correlation between snapshots, which is not consistent with the real environment. Hence, the block sparse Bayesian learning (Block-SBL) has recently received a lot of attention. To enhance the robustness of the traditional Block-SBL based method to mutual coupling (MC), a robust Block-SBL method is proposed to achieve off-grid DOA estimation for temporally correlated source in this paper. Firstly, in the proposed method, a linear transformation is conducted based on the banded complex symmetric Toeplitz structure of the mutual coupling matrix (MCM) to eliminate the influence of MC between the array elements. Then, in order to improve the estimation performance, the signal subspace fitting (SSF) technique is introduced to construct an equivalent signal model, which is realized by eigenvalue decomposition of the received signal covariance matrix. Based on the constructed equivalent signal model, the SBL process is finally utilized to estimate parameters. In the process of the estimation of parameters, the equivalent signal variance is estimation by expectation maximization (EM) method and the off-grid error is reduced by the dynamic updating of spatial discrete grid points, which is realized by finding the roots of a polynomial. The simulation results demonstrate that the proposed method is more robust to the off-grid error and array mutual coupling, and can provide better DOA estimation performance than the traditional SBL and Block-SBL method.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116954428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Inversion of Ocean Wavenumber Spectrum from the Bistatic High-frequency Radar Sea Echoes 双基地高频雷达海洋回波的海洋波数谱反演

2022 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2022-04-25 DOI: 10.1109/piers55526.2022.9793239

Fan Ding, Chen Zhao, Ze-zong Chen, Min Deng

引用次数: 0

A Broadband High-efficiency Multifunctional Ultrathin Metasurfaces 一种宽带高效多功能超薄超表面

2022 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2022-04-25 DOI: 10.1109/piers55526.2022.9793184

Yufang Wang, Y. Ge, Z. Chen

引用次数: 0

A Wideband C-shaped Open Slot Array for Millimeter-wave Applications 一种用于毫米波应用的宽带c形开槽阵列

2022 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2022-04-25 DOI: 10.1109/piers55526.2022.9792949

Guang-Hua Sun, H. Wong

{"title":"A Wideband C-shaped Open Slot Array for Millimeter-wave Applications","authors":"Guang-Hua Sun, H. Wong","doi":"10.1109/piers55526.2022.9792949","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9792949","url":null,"abstract":"In this paper, we propose a wideband and high-gain planar antenna array for millimeter-wave applications. In this array, the slot radiator with a C-shaped and open structure is used as the antenna element. Due to the travelling-wave radiation of the open slot, the slot radiator can produce a wideband radiation and have an impedance bandwidth of 40% with the |S11| below –10dB from 21.6 GHz to 32.6 GHz. The gain of the proposed antenna element is up to 12.5 dBi owning to its large radiation aperture formed by two C-shaped open slot. Based on this wideband and high-gain antenna element, we design an 8 × 8 antenna array with a 1-to-64 SIW full-corporate feed network. The proposed array is fabricated in a two-layer substrate using standard printed circuit board (PCB) technology. The measured results show that the proposed antenna array has an impedance bandwidth of 37% from 21.4 to 31GHz. The measured gain of the proposed array is from 26.3 to 28.4 dBi over the operating bandwidth, with an average radiation efficiency of 70%. With wide bandwidth and the high directive gain, the proposed antenna array is a good candidate for long-distance millimeter-wave communications.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132566818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0