2022 Photonics & Electromagnetics Research Symposium (PIERS)最新文献_第8页

On the Color Visualization of Three-component Model-based Decomposition for Polarimetric SAR Data 基于三分量模型分解的极化SAR数据颜色可视化研究

2022 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2022-04-25 DOI: 10.1109/PIERS55526.2022.9792977

Xun Wang, Dong Li, Yunhua Zhang, Jiefang Yang, Liting Liang

引用次数: 0

Mapping and Evaluation of the 2020 Catastrophic Floods in the Yangtze River Basin Using Sentinel-1 Imagery 基于Sentinel-1影像的2020年长江流域特大洪水制图与评价

2022 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2022-04-25 DOI: 10.1109/piers55526.2022.9792953

Minmin Huang, Shuanggen Jin, Xueqin Gao

{"title":"Mapping and Evaluation of the 2020 Catastrophic Floods in the Yangtze River Basin Using Sentinel-1 Imagery","authors":"Minmin Huang, Shuanggen Jin, Xueqin Gao","doi":"10.1109/piers55526.2022.9792953","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9792953","url":null,"abstract":"Flood disaster is one of the natural disasters with the highest frequency in the Yangtze River, which caused immeasurable losses, particularly catastrophic floods in the Yangtze River Basin during July and August 2020. Nowadays, Synthetic aperture radar (SAR) imagery can monitor and evaluate floods in any weather conditions. In this paper, the spatial-temporal variations of the 2020 catastrophic flood are investigated and evaluated from Sentinel-1 date and Otsu thresholding method in the two perspectives of area disparity and flood duration. Four severe flood sections of the Yangtze River (Yueyang, Hankou, Jiujiang, Chizhou) are taken as study objects. Yueyang and Hankou sections are in the middle reach and the Jiujiang and Chizhou section are in the lower section. The results show that the average water body area in 2020 was 20.40% larger than that in 2019 in four sections of the Yangtze River. The upper sections are suffered more from floods for a longer time. The water area of four sections shows a highly positive correlation with the water level, which is the highest in Jiujiang Section, even to 0.9924. The four sections are affected by the flood events in 2020 with the order as follows: Yueyang section > Jiujiang section > Hankou section > Chizhou section.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"43 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":"125965138","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

Homogenization Based Fast Computation of Electromagnetic Scattering by Inhomogeneous Objects with Honeycomb Structures 基于均匀化的蜂窝结构非均匀物体电磁散射快速计算

2022 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2022-04-25 DOI: 10.1109/piers55526.2022.9793162

Xiaolei Yuan, M. Gou, Zeng Yang, Ming-lin Yang, X. Sheng

引用次数: 0

UWB-MIMO Antenna with Band-notched Structure 带缺口结构UWB-MIMO天线

2022 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2022-04-25 DOI: 10.1109/piers55526.2022.9792972

Baoqing Huang, G. Cheng

引用次数: 0

A Metasurface Omnidirectional Antenna Design Using CMA 基于CMA的超表面全向天线设计

2022 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2022-04-25 DOI: 10.1109/piers55526.2022.9792593

Fangzheng Ji, Zhixin Wang, Liyin Nie, Zhaoneng Jiang

引用次数: 0

Long-lived Bloch Wave in All-dielectric Photonic Crystal 全介电光子晶体中的长寿命布洛赫波

2022 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2022-04-25 DOI: 10.1109/piers55526.2022.9792869

A. N. Bogolyubov, Z. Dombrovskaya, A. D. Nikitchenko

引用次数: 0

An Active Metamaterial Antenna with Tunable Zero-order Resonances 具有可调谐零阶共振的有源超材料天线

2022 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2022-04-25 DOI: 10.1109/PIERS55526.2022.9793108

Zhanheng Liu, Hongtao Liu, Y. Luo

引用次数: 1

Modelling Studies of Magnetostatic Modes in Hybrid MW-YIG Structures 混合MW-YIG结构静磁模态建模研究

2022 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2022-04-25 DOI: 10.1109/piers55526.2022.9792963

M. Maksutoglu, A. Ghirri, S. Yorulmaz, Fikret Yildiz, M. Affronte, B. Rameev

{"title":"Modelling Studies of Magnetostatic Modes in Hybrid MW-YIG Structures","authors":"M. Maksutoglu, A. Ghirri, S. Yorulmaz, Fikret Yildiz, M. Affronte, B. Rameev","doi":"10.1109/piers55526.2022.9792963","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9792963","url":null,"abstract":"Studies on spin waves (magnons) formed by collective electron spin excitations in magnetic materials have recently gained importance due to their great potential for magnonics and hybrid quantum systems. In this study, the magnetostatic spin-wave modes excited as a result of the coupling between the 2D microwave resonator and the YIG sphere have been investigated computationally. The simulations have been performed using commercial finite element method software (CST Studio Suite). The 2D microwave resonator is realized on the ground plane of the broadband microstrip structure by using a low-loss printed circuit board. The calculations reveal the Q factor to be about 300 by optimizing the resonance frequency to 7 GHz. The most interesting result of simulations is the observation that the magneto-static spin-wave modes of the YIG sphere may be excited depending on the geometry of the hybrid structure. A strong interaction between the YIG and the microwave resonator observed in the dispersion curves of these modes reveals the realization of the strong coupling regime, which is a prerequisite of their use in quantum hybrid devices.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"59 Pt A 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":"114114032","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

A Wideband Circularly Polarized Leaky-wave Antenna 宽带圆极化漏波天线

2022 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2022-04-25 DOI: 10.1109/piers55526.2022.9793283

Jingzheng Lu, Jun-ping Geng, Weinan Gao, Da Su, Yangzhou Zhang, Jing Zhang, Chaofan Ren, Kun Wang, Han Zhou, Chong He, Xianling Liang, R. Jin

{"title":"A Wideband Circularly Polarized Leaky-wave Antenna","authors":"Jingzheng Lu, Jun-ping Geng, Weinan Gao, Da Su, Yangzhou Zhang, Jing Zhang, Chaofan Ren, Kun Wang, Han Zhou, Chong He, Xianling Liang, R. Jin","doi":"10.1109/piers55526.2022.9793283","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9793283","url":null,"abstract":"In this paper, a novel circularly polarized (CP) leaky-wave antenna with wide bandwidth is presented. The proposed antenna has a structure based on a microstrip line loaded with X-shaped slots. To generate circularly polarized waves, the feeding position of the microstrip line is shifted from the center of the X-slot to the edge. Then the straight feed line can form the phase difference between two arms of the X-slot without a meandering line, increasing the radiation efficiency. When the phase difference is 90degrees, the two arms radiate orthogonal field within required phases, thus synthesizing circular polarization. The arms of the X-slot have no spatial phase difference which makes the radiating element have a wide CP bandwidth. The simulated results show that the proposed antenna realizes available impedance bandwidth of 45.01% (2.72GHz–4.30GHz) and CP bandwidth of 13.01% (3GHz–3.42GHz). The radiation efficiency of the leaky-wave antenna is from 82.1% to 95.4% and the gain is from 2.48dBi to 3.6dBi with bi-directional radiation in the operating bandwidth. The overall size of the proposed antenna is $0. 356 lambda_{0}, times 0. 356 lambda_{0}$, where $lambda _{0}$ is the free-space wavelength at the center frequency of the operating bandwidth. According to the phase transmission characteristic, it is convenient to extend a backward to forward scanning array with the proposed antenna. With the wide bandwidth and high scanning rate, the array has the potential to realize large-angle frequency scanning with circular polarization. The proposed leaky-wave antenna could be a good choice for radar applications and microwave imaging.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"1 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":"128200585","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: 3