2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)最新文献_第9页

A Broadband High Efficiency Class-J Power Amplifier with a Novel Output Matching Method 一种新型输出匹配方法的宽带高效率j类功率放大器

2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE) Pub Date : 2018-12-01 DOI: 10.1109/ISAPE.2018.8634146

Zhiwei Zhang, Guohua Liu, Hao Sun, Zhi-qun Cheng

引用次数: 0

Constraining interference in satellite reception and ground station receiver 抑制卫星接收和地面站接收机的干扰

2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE) Pub Date : 2018-12-01 DOI: 10.1109/isape.2018.8634364

Fuling Zhao, Yongjun Wang, Shaolin He

引用次数: 0

Analysis of Electromagnetic Distribution in Building Illuminated with Airborne Antenna Array by Using a Half-space FDTD 用半空间时域有限差分法分析机载天线阵照射下建筑物的电磁分布

2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE) Pub Date : 2018-12-01 DOI: 10.1109/ISAPE.2018.8634116

Min Zhang, Lianyan Zhu

引用次数: 0

Integrated Trajectory Optimization of Multiple Aircraft under Electronic Warfare Environment 电子战环境下多机综合弹道优化

2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE) Pub Date : 2018-12-01 DOI: 10.1109/ISAPE.2018.8634140

Wei Chen, Yuanchao Yang, Hao Li

引用次数: 0

Single Feed Broadband Circularly Polarized Antenna With Parasitic Patch 带寄生贴片的单馈宽带圆极化天线

2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE) Pub Date : 2018-12-01 DOI: 10.1109/ISAPE.2018.8634278

Zepei Jiang, Fushun Zhang

引用次数: 2

Hidden Markov Model Based on Target Narrow Pulse Laser Transient Characteristics 基于目标窄脉冲激光瞬态特性的隐马尔可夫模型

2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE) Pub Date : 2018-12-01 DOI: 10.1109/ISAPE.2018.8634126

Yali Hou, Hong Su, Bo Tian, Tie Li

引用次数: 0

Reducing Mutual Coupling of Millimeter Wave Array Antennas by Fractal Defected Ground Structure 利用分形缺陷地面结构降低毫米波阵列天线互耦

2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE) Pub Date : 2018-12-01 DOI: 10.1109/ISAPE.2018.8634210

Jingxia Qiang, F. Xu, Wenjun Fan

引用次数: 5

A new TMA method for state estimation of underwater target 一种新的水下目标状态估计TMA方法

2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE) Pub Date : 2018-12-01 DOI: 10.1109/ISAPE.2018.8634384

Wei Sun, Pulong Nan

引用次数: 1

Meridional Direction Features of Equatorial and Low-Latitude Plasma Depletions Observed by Swarm Satellites 群卫星观测赤道和低纬度等离子体耗竭的经向特征

2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE) Pub Date : 2018-12-01 DOI: 10.1109/ISAPE.2018.8634039

Shihan Zhang, Yuhua Zou

{"title":"Meridional Direction Features of Equatorial and Low-Latitude Plasma Depletions Observed by Swarm Satellites","authors":"Shihan Zhang, Yuhua Zou","doi":"10.1109/ISAPE.2018.8634039","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634039","url":null,"abstract":"The equatorial and low-latitude plasma depletions is an important space weather phenomenon, which often produce severe ionospheric scintillations. According to the well-known formation mechanism of the equatorial and low-latitude plasma depletions, i.e., the generalized Rayleigh-Taylor (RT) instability mechanism, these plasma depletions are expected to occur mainly at night and appear simultaneously at the geomagnetic conjugate locations in the northern and southern hemisphere. Although many studies on the equatorial and low-latitude plasma depletions have been performed in recent years, there are few reports on the variation features of the equatorial and low-latitude plasma depletions along the geomagnetic meridian direction. In this study, we have analyzed in situ electron density measurements obtained by the three Swarm satellites in the 55°E-155°E geographic longitude (GLON) sector during the equinox months of high solar activity years, i.e., February-April 2014, September-November 2014, February-April 2015, and September-November 2015. We found that the equatorial and low-latitude plasma depletions were observed mainly at night, which are consistent with the statements of the generalized RT instability mechanism. Moreover, we found that in most cases the appearance of the equatorial and low-latitude plasma depletions presented the north-south hemisphere symmetry. However, sometimes (with the occurrence rate of ∼16-27%) they presented the north-south hemisphere asymmetry, namely, they were only detected at the low-latitude region in the northern hemisphere or southern hemisphere, which cannot be explained by the generalized RT instability mechanism.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125323464","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 2D Numerical Study of the Langmuir Parametric Instability in the Ionospheric Modification 电离层扰动中Langmuir参数不稳定性的二维数值研究

2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE) Pub Date : 2018-12-01 DOI: 10.1109/ISAPE.2018.8634388

T. Feng, Moran Liu, Chen Zhou

{"title":"A 2D Numerical Study of the Langmuir Parametric Instability in the Ionospheric Modification","authors":"T. Feng, Moran Liu, Chen Zhou","doi":"10.1109/ISAPE.2018.8634388","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634388","url":null,"abstract":"Parametric Decay Instability (PDI) plays an important role in the interaction of the high-power HF EM waves with ionosphere plasma. In this study, we have constructed a 2D numerical simulation model for studying PDI with a nearly realistic ionosphere background and a radio wave propagation model by taking a proper processing for the routine dynamic equations of plasma with generalized Zakharov method. The simulation results found that high-power HF EM waves could excite two electrostatic modes of a Langmuir wave and an ion acoustic wave near the reflection point of the ordinary wave (O-mode) within a timescale order of millisecond. The amplitude of density perturbation grows exponentially and significantly influencing the plasma frequency related to ‘low frequency’ density background. These processes are also followed by plasma caviton structures and trapped Langmuir waves. Finally, the O-mode heating leads to an intense localized turbulence. This paper also presents the simulation results of Langmuir parametric instability (LPI) excited by powerful HF wave heating at the O-mode reflection height. The study of this article contributes to formation of a deep impression for the physical mechanism of the Parametric Decay Instability (PDI). It is also helpful to research on the nonlinear interaction between the high-power HF EM waves and ionosphere plasma.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124217197","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