2021 38th National Radio Science Conference (NRSC)最新文献_第3页

Compact Dual-Band Dual-Polarized Microstrip Patch Antenna for Synthetic Aperture Radar 用于合成孔径雷达的紧凑型双频双极化微带贴片天线

2021 38th National Radio Science Conference (NRSC) Pub Date : 2021-07-27 DOI: 10.1109/NRSC52299.2021.9509785

M. A. El-Hassan, K. Hussein, K. Awadalla

{"title":"Compact Dual-Band Dual-Polarized Microstrip Patch Antenna for Synthetic Aperture Radar","authors":"M. A. El-Hassan, K. Hussein, K. Awadalla","doi":"10.1109/NRSC52299.2021.9509785","DOIUrl":"https://doi.org/10.1109/NRSC52299.2021.9509785","url":null,"abstract":"A dual frequency-band (L and S) dual linearly-polarized microstrip patch antenna is proposed for synthetic aperture radar (SAR) system and communications applications. The proposed square patch antenna is printed on a roger TMM4 substrate. The proposed antenna has four L-shaped slots cut at the patch corners and four axial slots cut at the middle of each edge and perpendicular to it. The antenna has two ports; applying the feeding at one of them gives one of two orthogonal polarizations. The antenna is relatively compact, with an input impedance of 50Ω at each port. The antenna has been designed to work at 1.25 GHz and 3.3 GHz. The high isolation between the two feeding ports is −35 dB at 1.25GHz and −30 dB at 3.2GHz. The radiation patterns for the two polarizations are almost the same. The maximum gain of the antenna is about 4 dBi and 9 dBi at 1.25GHz and 3.3GHz, respectively. The CST commercial package has been used to analyze such antenna, and the HFSS package is used for confirmation of the produced results. The simulation results have proved the practicability of this antenna for dual polarized applications.","PeriodicalId":231431,"journal":{"name":"2021 38th National Radio Science Conference (NRSC)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124239881","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

Cole-Cole Modelling of Reduced Graphene Oxide Decorated CuO Nano-Spheres Based Waterproof Conductive Ink for Flexible Electrodes 柔性电极用还原氧化石墨烯修饰CuO纳米球基防水导电油墨的Cole-Cole建模

2021 38th National Radio Science Conference (NRSC) Pub Date : 2021-07-27 DOI: 10.1109/NRSC52299.2021.9509778

A. Maged, A. Madian, Amany I. Raafat, A. E. Ali

{"title":"Cole-Cole Modelling of Reduced Graphene Oxide Decorated CuO Nano-Spheres Based Waterproof Conductive Ink for Flexible Electrodes","authors":"A. Maged, A. Madian, Amany I. Raafat, A. E. Ali","doi":"10.1109/NRSC52299.2021.9509778","DOIUrl":"https://doi.org/10.1109/NRSC52299.2021.9509778","url":null,"abstract":"Flexible electrodes are developed using a novel conductive ink with various ratios of graphene nanoflakes decorated with copper nanospheres as a conductive filler. These electrodes represent potential candidates for energy storage devices and solid-state batteries. The electrodes are studied by AC measurements in the range of (0.1 Hz–500 kHz). Electrical impedance measurement data have been utilized for modeling the electrical properties of the conductive ink. The fitting is done using Z-Fit software and a randomized method followed by the Levenberg-Marquardt using the Cole-Cole model. The equivalent circuits are simulated by the Z-Sim software and values are compared with the theoretical values. The error between simulation value and theoretical value was found to be minimum. The aim of the work described in the present paper is to establish an equivalent electrical circuit for the conductive ink electrodes. The best and simplest circuit representation which gives the best fitting for the Cole-Cole and Nyquist plots consists of two resistors in parallel with a capacitor in series. The values of the electrical components are tabled, and the Cole-Cole plot is fitted to the measured data.","PeriodicalId":231431,"journal":{"name":"2021 38th National Radio Science Conference (NRSC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124381309","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 38 GHz Modified Circular Microstrip Patch Antenna for 5G Mobile Systems 一种用于5G移动系统的38 GHz改进圆形微带贴片天线

2021 38th National Radio Science Conference (NRSC) Pub Date : 2021-07-27 DOI: 10.1109/NRSC52299.2021.9509781

Esraa I. Hassan, R. Hamad, Mohamed I. Omar

引用次数: 0

Design and Performance Evaluation of a Multiuser OFDM System Based on Differential Quadrature Chaos-Shift-Keying Spread Spectrum 基于微分正交混沌移键控扩频的多用户OFDM系统设计与性能评价

2021 38th National Radio Science Conference (NRSC) Pub Date : 2021-07-27 DOI: 10.1109/NRSC52299.2021.9509809

A. Y. Hassan, Mahmoud O. El Beshry, Khaled T. Harb, H. El Hennawy

{"title":"Design and Performance Evaluation of a Multiuser OFDM System Based on Differential Quadrature Chaos-Shift-Keying Spread Spectrum","authors":"A. Y. Hassan, Mahmoud O. El Beshry, Khaled T. Harb, H. El Hennawy","doi":"10.1109/NRSC52299.2021.9509809","DOIUrl":"https://doi.org/10.1109/NRSC52299.2021.9509809","url":null,"abstract":"This paper aims to propose a multiuser OFDM system with non-coherent differential quadrature chaos-shift-keying (OFDM-DQCSK) modulation. The proposed system is based on direct sequence spread spectrum where chaotic codes replace conventional spreading sequences. Orthogonal sets of chaotic spreading codes can be generated. The proposed system uses duplicated reference subcarriers that are private and non-shared. At the receiver, these reference subcarriers are used for the differential non-coherent de-spreading. Neither complex channel estimators nor carrier synchronization is required for demodulation. The chaotic reference signals are averaged at the receiver so that the additive white gaussian noise (AWGN) on the reference signal is averaged to a negligible value. A simulation of the bit error rate performance is performed in the presence of AWGN, multipath Rayleigh flat-fading channels and multiple access interference (MAI). In conclusion, the proposed non-coherent system achieves a remarkable improvement due to the usage of the Reference Averaging Technique.","PeriodicalId":231431,"journal":{"name":"2021 38th National Radio Science Conference (NRSC)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128083676","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

High-Gain Annular Ring with Meander Slots Antenna Array for RFID Applications 用于RFID应用的高增益环形弯曲槽天线阵列

2021 38th National Radio Science Conference (NRSC) Pub Date : 2021-07-27 DOI: 10.1109/NRSC52299.2021.9509779

B. M. Yousef, Zeeshan Yousuf, A. M. Ameen, Ayman Elboushi

引用次数: 0

Polynomial FLANN Classifier for Fetal Cardiotocography Monitoring 胎儿心电监护的多项式FLANN分类器

2021 38th National Radio Science Conference (NRSC) Pub Date : 2021-07-27 DOI: 10.1109/NRSC52299.2021.9509832

Mohammad T. Haweel, O. Zahran, F. A. Abd El-Samie

引用次数: 2

Compact Multi-bits Chipless-RFID Curl Resonator Tag with Temperature Sensing Capability 紧凑的多比特无芯片rfid卷曲谐振器标签与温度传感能力

2021 38th National Radio Science Conference (NRSC) Pub Date : 2021-07-27 DOI: 10.1109/NRSC52299.2021.9509833

H. Malhat, E. A. El-Refaay, S. Zainud-Deen

{"title":"Compact Multi-bits Chipless-RFID Curl Resonator Tag with Temperature Sensing Capability","authors":"H. Malhat, E. A. El-Refaay, S. Zainud-Deen","doi":"10.1109/NRSC52299.2021.9509833","DOIUrl":"https://doi.org/10.1109/NRSC52299.2021.9509833","url":null,"abstract":"This paper proposes a compact multi-bits chipless-RFID tag using fully printed resonators with dual performance of tagging and sensing temperature. Each bit is modelled as curl resonator coupled to microstrip line and is printed on metal-backed Rogers RO4003 substrate. A −10 dB attenuation level is obtained with narrow bandwidth and power reflection of −3.2 dB. The effect of the tag dimensions on the transmission coefficient response is introduced. The resonance frequency of each bit is controlled via controlling the curl arm’s length. The multi-bits RFID tag is modelled using multi-curl resonators arranged next to microstrip line with different arm lengths. A multi-bits chipless-RFID tags with 3-bits, 6-bits and 12-bits are designed in the 3–7 GHz frequency band. The dimensions of 6-bits code are 60×17 mm2 and for 12-bits code are 29.75×34 mm2. A temperature sensing capability is achieved via integrated Stanyl polyamide material with the curl resonator. The first bit is used for temperature sensing while the other bits are used for data encoding. The proposed chipless-RFID tags are simulated using finite element method (FEM) and finite integral technique (FIT).","PeriodicalId":231431,"journal":{"name":"2021 38th National Radio Science Conference (NRSC)","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124557514","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

Ultra-Low-Power Low Drop-Out (LDO) Voltage Regulator With Improved Power Supply Rejection 具有改进电源抑制的超低功耗低差(LDO)稳压器

2021 38th National Radio Science Conference (NRSC) Pub Date : 2021-07-27 DOI: 10.1109/NRSC52299.2021.9509816

Hazem H. Hammam, H. Omran, S. Ibrahim

引用次数: 0

Experimental Validation of Interference Alignment Techniques for Homogeneous and Three-Tier HetNets Using USRP-Testbed 基于usrp测试平台的均匀三层HetNets干扰对准技术实验验证

2021 38th National Radio Science Conference (NRSC) Pub Date : 2021-07-27 DOI: 10.1109/NRSC52299.2021.9509786

Hebatullah M. Sakr, A. Diab, Ramy Elamrawy, M. Elsabrouty

{"title":"Experimental Validation of Interference Alignment Techniques for Homogeneous and Three-Tier HetNets Using USRP-Testbed","authors":"Hebatullah M. Sakr, A. Diab, Ramy Elamrawy, M. Elsabrouty","doi":"10.1109/NRSC52299.2021.9509786","DOIUrl":"https://doi.org/10.1109/NRSC52299.2021.9509786","url":null,"abstract":"Validating the performance of wireless networks using hardware testbeds is an essential task to see networks’ performance in real environments. In this paper, we present an experimental evaluation of the performance of different interference alignment techniques for both homogeneous and heterogeneous networks (HetNets) conducted on a wireless testbed comprised of a total of 20 multi-input multi-output (MIMO) software-defined radio (SDR) devices. Four interference alignment (IA) techniques are considered, namely, rank constrained rank minimization (RCRM), weighted rank constrained rank minimization (WRCRM), leakage minimization and maximum signal-to-interference-plus-noise ratio (SINR). The four IA algorithms are first implemented on a downlink three-user homogeneous network using a cluster of 6 USRPs and the LabVIEW programming environment. Then, the comparison is conducted for a three-tier downlink heterogeneous network with a macro base station (BS) of 6 antennas, a small BS with 4 antennas, and a cognitive-radio BS with 2 antennas, giving a mutually interfering broadcast channel (MIBC). Our paper shows the implementation procedures and discusses the systems’ configuration from both hardware and software aspects. The experimental real-time results compare the performance of the different IA schemes showing the impact of practical constraints on the evaluation results.","PeriodicalId":231431,"journal":{"name":"2021 38th National Radio Science Conference (NRSC)","volume":"136 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133454456","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

Optical Fiber Filters Linewidth Enhancement Based on Erbium-doped Photonic Crystal Fiber Cavities 基于掺铒光子晶体光纤腔的光纤滤波器线宽增强

2021 38th National Radio Science Conference (NRSC) Pub Date : 2021-07-27 DOI: 10.1109/NRSC52299.2021.9509787

Mohamed Kilany, Zhou Ding, George A. Adib, Y. Sabry, Chengxiang Liu, D. Khalil

引用次数: 0