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2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)最新文献

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The interplay between spin waves and microwave magnetic field in magnetization textures and planar magnetic nanostructures 磁化织构与平面磁性纳米结构中自旋波与微波磁场的相互作用
2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2021-11-01 DOI: 10.1109/comcas52219.2021.9629033
J. Kłos, M. Krawczyk, S. Mieszczak, P. Gruszecki
{"title":"The interplay between spin waves and microwave magnetic field in magnetization textures and planar magnetic nanostructures","authors":"J. Kłos, M. Krawczyk, S. Mieszczak, P. Gruszecki","doi":"10.1109/comcas52219.2021.9629033","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629033","url":null,"abstract":"The magnetic microwave field is accompanying the magnetization precession in magnetic materials. However, the precessional dynamics can propagate in the form of the dipolar spin wave only if the magnetic field can effectively mediate the coupling between the magnetic moments at the distance. We refer to counter-intuitive but well known effect - the absence of the dynamic dipolar coupling in an unconstrained and uniformly magnetized medium, to stress the role of the confined geometries and magnetization textures for shaping the dipolar interaction and molding the propagation of the dipolar spin waves. The paper discusses the electromagnetic origin of the dipolar spin waves and explains the role of magnetostatic approximation. Within this approximation, we can introduce the concept of magnetostatic potential, which is very useful for describing of the origin of the dynamic demagnetizing field providing the coupling for the dipolar spin waves.","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"23 Suppl 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124566532","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
Compact Stacked Rugged GaN Low-Noise Amplifier MMIC 紧凑堆叠坚固GaN低噪声放大器MMIC
2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2021-11-01 DOI: 10.1109/comcas52219.2021.9629072
E. Kaule, Peng Luo, Cristina Andrei, S. Chevtchenko, M. Rudolph
{"title":"Compact Stacked Rugged GaN Low-Noise Amplifier MMIC","authors":"E. Kaule, Peng Luo, Cristina Andrei, S. Chevtchenko, M. Rudolph","doi":"10.1109/comcas52219.2021.9629072","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629072","url":null,"abstract":"Rugged GaN HEMT LNAs are well established components for high-performance microwave receivers. In a previous work, we introduced the concept of a stacked circuit topology, which allows for a power handling capability exceeding conventional GaN HEMT designs. In this paper, we present an improved design of a stacked GaN LNA MMIC, showing that the concept is capable of providing competitive noise figures while minimizing the requirement for additional chip area.","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131119110","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
Metasurface Based Compact Dual Band Antenna with Wide Bandwidths 基于超表面的紧凑型宽频双频天线
2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2021-11-01 DOI: 10.1109/comcas52219.2021.9629104
S. Nagarnaik, J. Mukherjee
{"title":"Metasurface Based Compact Dual Band Antenna with Wide Bandwidths","authors":"S. Nagarnaik, J. Mukherjee","doi":"10.1109/comcas52219.2021.9629104","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629104","url":null,"abstract":"A compact, dual band, unidirectional antenna backed by metasurface (MS) is proposed which operates over wide bandwidths. MS is composed of s shaped split ring resonator (SRR) like square unit cells providing zero reflection phase at two frequencies for dual band operation. Simple printed circular monopole antenna placed above MS functions as feed antenna. The proposed antenna operates over two wide bands from 4 to 6 GHz with 40% bandwidth and from 6.8 to 9 GHz with 27 % bandwidth. Gain variations in band I is 5.9-6.8 dBi with 65% efficiency and in band II is 6.7-7.9 dBi with 70% efficiency. Antenna is fabricated on FR-4 substrate and its performance is verified experimentally.","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127360243","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
Counterintuitive Constrained Optimization Strategy for Phased-Array Radar Areal Coverage 相控阵雷达区域覆盖反直觉约束优化策略
2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2021-11-01 DOI: 10.1109/comcas52219.2021.9629108
M. Haspel
{"title":"Counterintuitive Constrained Optimization Strategy for Phased-Array Radar Areal Coverage","authors":"M. Haspel","doi":"10.1109/comcas52219.2021.9629108","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629108","url":null,"abstract":"The optimization of phased-array RADAR areal coverage on the plane, in 2D, is considered for a semi-infinite strip where the agent carrying the RADAR travels at uniform velocity along the centerline of the strip. Because the system is symmetric we naturally are led to expect an optimal solution, with maximal areal coverage, which is symmetric and well ordered. However, in general, we find the optimal solution to be asymmetric and random in nature, defying intuition. An algorithm was developed for getting at these solutions and these optimal solutions are found to be far superior to ordered arrangements and random constructions. The conclusions are valid for other sensors modeled with 3D conical detection projected onto the plane.","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124005524","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
Design and measurements of a 28 GHz High-Linearity LNA in 45nm SOI-CMOS 45nm SOI-CMOS中28ghz高线性LNA的设计与测量
2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2021-11-01 DOI: 10.1109/comcas52219.2021.9629091
V. Lammert, P. Sakalas, A. Werthof, R. Weigel, V. Issakov
{"title":"Design and measurements of a 28 GHz High-Linearity LNA in 45nm SOI-CMOS","authors":"V. Lammert, P. Sakalas, A. Werthof, R. Weigel, V. Issakov","doi":"10.1109/comcas52219.2021.9629091","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629091","url":null,"abstract":"This work shows the design and measurements of a 28 GHz low-noise amplifier, realized in Globalfoundries 45nm RFSOI CMOS technology. The enhanced linearity concept is based on the modified derivative superposition method. The presented measurements confirm a high IIP3 of 10 dBm, a power gain of 9 dB, a noise figure of 3.1 dB, and a total power consumption 34 mW from a 1.8 V supply voltage. The amplifier topology is built around an inductively degenerated, differential cascode amplifier with baluns and GSG pads at the input and output ports. In this paper, we extend our previous research results by providing deeper design insight, as well as experimental verification and comparison of the measurement results with the simulations.","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122180091","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
Non Parametric Data Augmentations Improve Deep-Learning based Brain Tumor Segmentation 非参数数据增强改进基于深度学习的脑肿瘤分割
2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2021-11-01 DOI: 10.1109/comcas52219.2021.9629083
Hadas Ben-Atya, Ori Rajchert, L. Goshen, M. Freiman
{"title":"Non Parametric Data Augmentations Improve Deep-Learning based Brain Tumor Segmentation","authors":"Hadas Ben-Atya, Ori Rajchert, L. Goshen, M. Freiman","doi":"10.1109/comcas52219.2021.9629083","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629083","url":null,"abstract":"Automatic brain tumor segmentation from Magnetic Resonance Imaging (MRI) data plays an important role in assessing tumor response to therapy and personalized treatment stratification. Manual segmentation is tedious and subjective. Deep-learning based algorithms for brain tumor segmentation have the potential to provide objective and fast tumor segmentation. However, the training of such algorithms requires large datasets which are not always available. Data augmentation techniques may reduce the need for large datasets. However current approaches are mostly parametric and may result in suboptimal performance. We introduce two non-parametric methods of data augmentation for brain tumor segmentation: the mixed structure regularization (MSR) and shuffle pixels noise (SPN). We evaluated the added value of the MSR and SPN augmentation on the brain tumor segmentation (BraTS) 2018 challenge dataset with the encoder-decoder nnU-Net architecture as the segmentation algorithm. Both MSR ans SPN improve the nnU-Net segmentation accuracy compared to parametric Gaussian noise augmentation.(Mean dice score increased from 80% to 82% and p-values=0.0022, 0.0028 when comparing MSR to non parametric augmentation for the tumor core and whole tumor experiments respectively. The proposed MSR and SPN augmentations has the potential to improve neural-networks performance in other tasks as well.","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115070472","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
Lossy Compression for MANET Distributed Network Control MANET分布式网络控制中的有损压缩
2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2021-11-01 DOI: 10.1109/comcas52219.2021.9629013
Aviel Glam, Lior Wunsch, Barak Farbman
{"title":"Lossy Compression for MANET Distributed Network Control","authors":"Aviel Glam, Lior Wunsch, Barak Farbman","doi":"10.1109/comcas52219.2021.9629013","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629013","url":null,"abstract":"Distributed wireless networks are a viable approach for achieving communication in infrastructure-less scenarios such as D2D (device-to-device) communication, and MANET (Mobile Ad-Hoc Networks). In most cases, achieving communication with-out an infrastructure comes at a cost of control overhead. Control messages in MANETs grow proportionally with the number of nodes in the vicinity of the originator. Networks are becoming denser and larger, and the overhead incurred is limiting the possible growth and efficiency of current networks. In this work, we investigate different approaches for control message compression. Methods range from lossless compression, lossy compression using JPEG, and \"directional\" lossy compression using Bloom filter. The trade-off between correctness and compression is shown through comparative simulations. It is shown that while lossy compression presents high risks for information corruption, the ability to adjust the level and direction of errors is sufficient for gaining compression value along with a minimal impact on network activity.","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115356692","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
Terahertz Active Nanosecond Gigawatt Compressor Thermal Feasibility 太赫兹主动纳秒千兆瓦压缩机热可行性
2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2021-11-01 DOI: 10.1109/comcas52219.2021.9629071
M. Kulygin, I. Litovsky, A. Chirkov, I. N. Shevelev, G. Kalynova, M. Shmelev
{"title":"Terahertz Active Nanosecond Gigawatt Compressor Thermal Feasibility","authors":"M. Kulygin, I. Litovsky, A. Chirkov, I. N. Shevelev, G. Kalynova, M. Shmelev","doi":"10.1109/comcas52219.2021.9629071","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629071","url":null,"abstract":"We discuss an opportunity of an active compressor to reach gigawatt power in nanosecond pulses compressing microsecond pulsed gyrotron radiation in a terahertz band. The compressor is based on a classic three-mirror circular scheme with an active switching element of plain gallium arsenide driven by picosecond optical laser pulse. The input radiation from a gyrotron is introduced to a corrugated coupling mirror. A dummy load absorbs the spurious spatial harmonics. While the idea of reaching compression ratio over 100, i.e. sub-gigawatt and even gigawatt peak output power, seems to be feasible [1], there are several thermal problems at different stages of compression. The results of the research for compromise solutions for heat removal and optimal pumping modes of the compressor are presented.","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123407133","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
Electromagnetic Shielding of a Bluetooth Antenna for Electric Vehicles Applying Metamaterial Structures 应用超材料结构的电动汽车蓝牙天线电磁屏蔽
2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2021-11-01 DOI: 10.1109/comcas52219.2021.9629035
Geyse M. B. Silva, L. Kretly
{"title":"Electromagnetic Shielding of a Bluetooth Antenna for Electric Vehicles Applying Metamaterial Structures","authors":"Geyse M. B. Silva, L. Kretly","doi":"10.1109/comcas52219.2021.9629035","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629035","url":null,"abstract":"The article proposes metamaterials application for the electromagnetic shielding of an antenna that may be used in a vehicle’s Bluetooth communication system. The electromagnetic shielding process consists of reducing the dispersion of electromagnetic waves that affect a device of interest. The three main parameters of interest in the electromagnetic shielding process are reflection, absorption, and multiple reflections. The results of the application of metamaterials in the microstrip antenna structure are promising in these parameters. The S11 parameter decreased from -21.7 dB (2.4 GHz) to -30.6 dB with metamaterial. The RCS (cross-section radar) was optimized with the application of metamaterials, for theta and phi = 0° the RCS decreased over the entire frequency range between 2.2 GHz and 3.4 GHz, in 3.2 GHz decrease from -23 dB to -26.9 dB, a 3.9 dB reduction in RCS at this frequency. The absorption factor of the reference antenna increased from 61% to 73%.","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123554776","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
Efficient MoM simulation of 3D metallic antenna connected to finite ground plane 有限接地平面三维金属天线的高效MoM仿真
2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2021-11-01 DOI: 10.1109/comcas52219.2021.9629009
J. Cavillot, C. Craeye, E. de Lera Acedo, N. Razavi-Ghods
{"title":"Efficient MoM simulation of 3D metallic antenna connected to finite ground plane","authors":"J. Cavillot, C. Craeye, E. de Lera Acedo, N. Razavi-Ghods","doi":"10.1109/comcas52219.2021.9629009","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629009","url":null,"abstract":"An efficient method is presented to simulate a 3D antenna connected to a finite ground plane itself lying on a layered medium. The spectral interactions between equivalent currents of the antenna and the finite ground plane are accelerated thanks to an asymptotic extraction of the integrated spectrum. The term accounting for the asymptotic part is obtained in free-space. Besides, efficient techniques for finite ground planes of canonical shapes cannot be considered in this case because the connection between the ground plane and the antenna is established with a fine mesh region which breaks the symmetries of the finite ground plane equivalent currents. Here a method to remedy this issue and which efficiently simulates defected rectangular ground planes is presented. The method is based on Toeplitz matrices and the defect is taken into account by exploiting a memory-efficient direct method.","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127689977","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
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