2011 28th National Radio Science Conference (NRSC)最新文献_第3页

Pseudo closed form solution for center fed monopole and dipole antenna 中心馈电单极和偶极天线的伪封闭解

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873579

S. Shams, M. Sharaf, A. Nafe, M. Nafe

{"title":"Pseudo closed form solution for center fed monopole and dipole antenna","authors":"S. Shams, M. Sharaf, A. Nafe, M. Nafe","doi":"10.1109/NRSC.2011.5873579","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873579","url":null,"abstract":"The proposed approaches to deal with the antenna problems fall in two categories, the numerical solution and the analytical solution. Another technique to deal with the antenna problems is the equivalent TEM mode theory, introduced in 2002. This model considered the antenna to be an inner conductor of a fictitous open circuited lossy transmission line thus the propagation constant has to be complex with real part and imaginary part representing the attenuation constant α and the phase constant β respectively. However the values of the phase constant and the attenuation constant were tabulated and no closed form expressions or empirical formulas were provided and the procedure for extracting the model parameters was rather complicated and had no regular approach. These drawbacks were covered to a great extent in 2008, they provided a simple approach for extracting the model parameters in the case of center fed dipole antenna. The propagation constants were interpolated using the proper empirical formulas. However these empirical formulas were functions of the characteristic impedance Zo. The used approach was based on estimating the characteristic impedance Zo without showing it's effect on the results. These empirical formulas showed accurate results for the half wavelength antenna and all it's odd multiples, on the other hand they showed a significant deviation for the complete wavelength antenna and it's multiples. Moreover this model was not verified for other types of antennas. This paper verifies the model for the monopole antenna and the center fed dipole antenna with empirical formula for the characteristic impedance Zo to give accurate results for antennas with different electrical lengths.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133335224","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

Hybrid encoding scheme for HSI model using the Minimum Color Difference 基于最小色差的HSI模型混合编码方案

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873624

N. Semary, M. Hadhoud, A. M. Abbas

引用次数: 2

Implementation of image fusion techniques for multi-focus images using FPGA 多聚焦图像融合技术的FPGA实现

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873618

Mohamed A. Mohamed, B. M. El-den

{"title":"Implementation of image fusion techniques for multi-focus images using FPGA","authors":"Mohamed A. Mohamed, B. M. El-den","doi":"10.1109/NRSC.2011.5873618","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873618","url":null,"abstract":"Image fusion is a process which combines the data from two or more source images from the same scene to generate one single image containing more precise details of the scene than any of the source images. Among many image fusion methods like averaging, principle component analysis and various types of Pyramid Transforms, Discrete cosine transform, Discrete Wavelet Transform special frequency and ANN and they are the most common approaches. In this paper multi-focus image is used as a case study. This paper addresses these issues in image fusion: Fused two images by different techniques which present in this research, Quality assessment of fused images with above methods, Comparison of different techniques to determine the best approach and Implement the best technique by using Field Programmable Gate Arrays (FPGA). First a brief review of these techniques is presented and then each fusion method is performed on various images. In addition experimental results are quantitatively evaluated by calculation of root mean square error, entropy; mutual information, standard deviation and peak signal to noise ratio measures for fused images and a comparison is accomplished between these methods. Then we chose the best techniques to implement them by FPGA.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"299 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131439587","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: 39

New compact microstrip multi-resonator with G-shaped defected ground structure 具有g形缺陷接地结构的新型紧凑型微带多腔器

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873589

E. Hamad, H. Atallah, Mohamed A. M. Hassanien

引用次数: 0

Octafilar helical antenna for handheld UHF RFID reader 用于手持式UHF RFID阅读器的八轴螺旋天线

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873577

S. H. Zauind-Deen, H. Malhat, K. Awadalla

引用次数: 12

Design of Immune Algorithm based two-dimensional recursive digital filters using multi-level Orthogonal Arrays 基于免疫算法的多级正交阵列二维递归数字滤波器设计

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873608

M. Abo-Zahhad, S. M. Ahamed, Nabil Sabor, A. Al-Ajlouni

{"title":"Design of Immune Algorithm based two-dimensional recursive digital filters using multi-level Orthogonal Arrays","authors":"M. Abo-Zahhad, S. M. Ahamed, Nabil Sabor, A. Al-Ajlouni","doi":"10.1109/NRSC.2011.5873608","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873608","url":null,"abstract":"Taguchi Immune Algorithm (TIA) is based on both features of the biological immune system and the Taguchi method which increases the ability of the Immune Algorithm (IA) to find the global optimal solution in a nonlinear space. In the TIA, the clonal proliferation within hypermutation for several antibody diversifications and the recombination by using the Taguchi method for the local search are integrated to improve the capabilities of exploration and exploitation. Two major tools are used in the Taguchi method; namely the Orthogonal Arrays (OAs) and the Signal to Noise Ratio (SNR). The effect of selecting the number of levels adopted in the construction of OAs on TIA is not studied before. So, this paper addresses the problem increasing the convergence speed of immune algorithm based two-dimensional recursive digital filters design process by adopting two, three and four levels OAs. For seek of comparison, the same computational experiments adopted in [1] are considered. Numerical results show that increasing the number of OA levels yields to faster convergence and better antibody genes selection in order to achieve the potential recombination, and consequently enhance the design process.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116457305","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

A compact, symmetric U-shaped monopole for ultra wide band operation 一个紧凑的，对称的u型单极子，用于超宽带操作

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873580

H. H. Awadalla, S. Shams, Allam Amma

引用次数: 8

Performance measures for image fusion based on wavelet transform and curvelet transform 基于小波变换和曲线变换的图像融合性能评价

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873622

A. Abd-El-Kader, Hossam El-Din Moustafa, S. Rehan

引用次数: 15

Brain causality investigation based on FMRI images time series using dynamic causal modelling augmented by Granger Causality 基于Granger因果关系增强动态因果模型的FMRI图像时间序列脑因果关系研究

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873643

Ashraf M. Mahroos, Y. Kadah

引用次数: 1

Split ring resonator-based miniaturized antennas 基于分环谐振器的小型化天线

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873585

A. Eldek, F. Elhefnawi

引用次数: 2