Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873579
S. Shams, M. Sharaf, A. Nafe, M. Nafe
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.
{"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}
Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873624
N. Semary, M. Hadhoud, A. M. Abbas
It's known that nonlinear color models like Hue-Saturation -Value/ Brightness/ Luminance/ Intensity (HSV/ HSB/ HSL/ HSI) have special feature for each channel. So in this paper we propose a hybrid compression system that deals with each channel with a suitable compression technique to obtain encoded images with less size and high decoding quality than the traditional encoding methods. There are three encoding techniques will be mixed in our proposed system; Object Compression Technique for the Hue channel, Minimum Color Difference for Saturation, and the standard Jpeg2000 encoding technique for the Intensity channel. The proposed system results in high compression ratio with very good decoding quality.
{"title":"Hybrid encoding scheme for HSI model using the Minimum Color Difference","authors":"N. Semary, M. Hadhoud, A. M. Abbas","doi":"10.1109/NRSC.2011.5873624","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873624","url":null,"abstract":"It's known that nonlinear color models like Hue-Saturation -Value/ Brightness/ Luminance/ Intensity (HSV/ HSB/ HSL/ HSI) have special feature for each channel. So in this paper we propose a hybrid compression system that deals with each channel with a suitable compression technique to obtain encoded images with less size and high decoding quality than the traditional encoding methods. There are three encoding techniques will be mixed in our proposed system; Object Compression Technique for the Hue channel, Minimum Color Difference for Saturation, and the standard Jpeg2000 encoding technique for the Intensity channel. The proposed system results in high compression ratio with very good decoding quality.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"7 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":"115331178","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}
Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873618
Mohamed A. Mohamed, B. M. El-den
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.
{"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}
Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873589
E. Hamad, H. Atallah, Mohamed A. M. Hassanien
In this paper, a compact multi-resonator with a new G-shaped defected ground structure (DGS) is proposed. The equivalent circuit model for the proposed resonator is presented and the equivalent circuit parameters are extracted. The influence of the geometrical dimensions on the resonant and cut-off frequencies is investigated. The new G-shaped has a good quality factor, lower cut-off frequency (7.5 GHz) and lower attenuation pole (−30 dB) if it is compared to other DGS structures with the same size. The proposed multi-resonator is realized using single resonator. Then, an implicit G-shaped is etched inside the main G-shaped to generate another resonant and so on without any additional size. Achieving compactness and more resonant frequencies are produced by multi-implicit G-shaped structures. The proposed multi-resonator could apply for high-performance band stop filter design. The design and analysis of the proposed multi-resonator is based on numerical experimentation techniques using a commercial EM simulator. The results are in excellent agreement.
{"title":"New compact microstrip multi-resonator with G-shaped defected ground structure","authors":"E. Hamad, H. Atallah, Mohamed A. M. Hassanien","doi":"10.1109/NRSC.2011.5873589","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873589","url":null,"abstract":"In this paper, a compact multi-resonator with a new G-shaped defected ground structure (DGS) is proposed. The equivalent circuit model for the proposed resonator is presented and the equivalent circuit parameters are extracted. The influence of the geometrical dimensions on the resonant and cut-off frequencies is investigated. The new G-shaped has a good quality factor, lower cut-off frequency (7.5 GHz) and lower attenuation pole (−30 dB) if it is compared to other DGS structures with the same size. The proposed multi-resonator is realized using single resonator. Then, an implicit G-shaped is etched inside the main G-shaped to generate another resonant and so on without any additional size. Achieving compactness and more resonant frequencies are produced by multi-implicit G-shaped structures. The proposed multi-resonator could apply for high-performance band stop filter design. The design and analysis of the proposed multi-resonator is based on numerical experimentation techniques using a commercial EM simulator. The results are in excellent agreement.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"39 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":"131814283","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}
Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873577
S. H. Zauind-Deen, H. Malhat, K. Awadalla
Octafilar helical antenna (OFHA) is proposed for handheld ultra-high-frequency (UHF) radio frequency identification (RFID) reader. The investigated antenna configuration consists of OFHA placed on reader device in the presence of human hand model. The antenna is designed at UHF band centred at 915 MHz. The antenna return loss, axial ratio, gain, co-polarized and cross-polarized field components are calculated using the finite element method (FEM) and compared with that calculated by finite integration technique (FIT) for verification of the simulated results. A comparison between the performance of the quadrifilar helical antenna (QFHA) and the octafiliar helical antenna (OFHA) designed at 915 MHz in the presence of the reader device and human hand model is investigated. The OFHA introduces high gain, high front to back ratio, good axial ratio and omnidirectional coverage.
{"title":"Octafilar helical antenna for handheld UHF RFID reader","authors":"S. H. Zauind-Deen, H. Malhat, K. Awadalla","doi":"10.1109/NRSC.2011.5873577","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873577","url":null,"abstract":"Octafilar helical antenna (OFHA) is proposed for handheld ultra-high-frequency (UHF) radio frequency identification (RFID) reader. The investigated antenna configuration consists of OFHA placed on reader device in the presence of human hand model. The antenna is designed at UHF band centred at 915 MHz. The antenna return loss, axial ratio, gain, co-polarized and cross-polarized field components are calculated using the finite element method (FEM) and compared with that calculated by finite integration technique (FIT) for verification of the simulated results. A comparison between the performance of the quadrifilar helical antenna (QFHA) and the octafiliar helical antenna (OFHA) designed at 915 MHz in the presence of the reader device and human hand model is investigated. The OFHA introduces high gain, high front to back ratio, good axial ratio and omnidirectional coverage.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"61 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":"114629186","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}
Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873608
M. Abo-Zahhad, S. M. Ahamed, Nabil Sabor, A. Al-Ajlouni
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.
{"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}
Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873580
H. H. Awadalla, S. Shams, Allam Amma
A novel design of an ultra wide band U-shaped monopole is presented and discussed. The antenna has a unique design consisting of a U shape with 2 additional arcs fed by a 50Ω microstrip feed. The antenna is low profile and has overall dimensions 30mm×30mm×1.5mm, which is compact in size for portable UWB applications. The simulated results show that the antenna has operating bandwidth (2.4–11.4GHz), satisfying the condition for ultra-wide band operation. The antenna exhibits band notch properties, and is able to prevent interference with the 5.2/5.8GHz WLAN and 5.5GHz WiMAX bands by varying the length of a small rectangle in the antenna structure. The symmetrical geometric structure of the antenna provides omnidirectional radiation patterns. The design criteria of this antenna as well as the outcome of the experimental results are presented in this paper. The antenna is fabricated and the return loss measured using a vector network analyzer. The measured and simulated results are in good agreement.
{"title":"A compact, symmetric U-shaped monopole for ultra wide band operation","authors":"H. H. Awadalla, S. Shams, Allam Amma","doi":"10.1109/NRSC.2011.5873580","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873580","url":null,"abstract":"A novel design of an ultra wide band U-shaped monopole is presented and discussed. The antenna has a unique design consisting of a U shape with 2 additional arcs fed by a 50Ω microstrip feed. The antenna is low profile and has overall dimensions 30mm×30mm×1.5mm, which is compact in size for portable UWB applications. The simulated results show that the antenna has operating bandwidth (2.4–11.4GHz), satisfying the condition for ultra-wide band operation. The antenna exhibits band notch properties, and is able to prevent interference with the 5.2/5.8GHz WLAN and 5.5GHz WiMAX bands by varying the length of a small rectangle in the antenna structure. The symmetrical geometric structure of the antenna provides omnidirectional radiation patterns. The design criteria of this antenna as well as the outcome of the experimental results are presented in this paper. The antenna is fabricated and the return loss measured using a vector network analyzer. The measured and simulated results are in good agreement.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"265 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":"116827600","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}
Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873622
A. Abd-El-Kader, Hossam El-Din Moustafa, S. Rehan
Curvelet transform is a recently-developed multi-scale transforms, which is more suitable for objects with curves. Applications of the curvelet transform have increased rapidly in the field of image fusion. Image fusion means the combining of two images into a single image that has the maximum information content without producing details that are non-existent in the given images. In the present work an algorithm for image fusion based on the curvelet transform was implemented, analyzed, and compared with a wavelet-based fusion algorithm. Two famous applications of image fusion are introduced; fusion of multi-focus images and fusion of multi-exposure images. Fusion results were evaluated and compared according to three measures of performance; the entropy (H), the mutual information (MI) and the amount of edge information (QAB/F). The three quantitative performance measures have shown that the curvelet based image fusion algorithm provides a slightly better fused image than the wavelet algorithm. In addition, the fused image has a better eye perception than the input ones.
{"title":"Performance measures for image fusion based on wavelet transform and curvelet transform","authors":"A. Abd-El-Kader, Hossam El-Din Moustafa, S. Rehan","doi":"10.1109/NRSC.2011.5873622","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873622","url":null,"abstract":"Curvelet transform is a recently-developed multi-scale transforms, which is more suitable for objects with curves. Applications of the curvelet transform have increased rapidly in the field of image fusion. Image fusion means the combining of two images into a single image that has the maximum information content without producing details that are non-existent in the given images. In the present work an algorithm for image fusion based on the curvelet transform was implemented, analyzed, and compared with a wavelet-based fusion algorithm. Two famous applications of image fusion are introduced; fusion of multi-focus images and fusion of multi-exposure images. Fusion results were evaluated and compared according to three measures of performance; the entropy (H), the mutual information (MI) and the amount of edge information (QAB/F). The three quantitative performance measures have shown that the curvelet based image fusion algorithm provides a slightly better fused image than the wavelet algorithm. In addition, the fused image has a better eye perception than the input ones.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"40 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":"132655777","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}
Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873643
Ashraf M. Mahroos, Y. Kadah
We propose a model that describes the interactions of several Brain Regions based on Functional Magnetic Resonance Imaging (FMRI) time series to make inferences about functional integration and segregation within the human brain. The method is demonstrated using dynamic causal modelling (DCM) augmented by Granger Causality (GC) using real data to show how such models are able to characterize interregional dependence. We extend estimating and reviewing designed model to characterize the interactions between regions and showing the direction of the signal over regions. A further benefit is to estimate the effective connectivity between these regions. All designs, estimates, reviews are implemented using Statistical Parametric Mapping (SPM) and GCCA toolbox, one of the free best software packages and published toolbox used to design the models and analysis for inferring about FMRI functional magnetic resonance imaging time series.
{"title":"Brain causality investigation based on FMRI images time series using dynamic causal modelling augmented by Granger Causality","authors":"Ashraf M. Mahroos, Y. Kadah","doi":"10.1109/NRSC.2011.5873643","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873643","url":null,"abstract":"We propose a model that describes the interactions of several Brain Regions based on Functional Magnetic Resonance Imaging (FMRI) time series to make inferences about functional integration and segregation within the human brain. The method is demonstrated using dynamic causal modelling (DCM) augmented by Granger Causality (GC) using real data to show how such models are able to characterize interregional dependence. We extend estimating and reviewing designed model to characterize the interactions between regions and showing the direction of the signal over regions. A further benefit is to estimate the effective connectivity between these regions. All designs, estimates, reviews are implemented using Statistical Parametric Mapping (SPM) and GCCA toolbox, one of the free best software packages and published toolbox used to design the models and analysis for inferring about FMRI functional magnetic resonance imaging time series.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"6 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":"123704051","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}
Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873585
A. Eldek, F. Elhefnawi
Two miniaturized microstrip-fed antennas composed of broadside coupled split ring resonators and excitation arc-shaped monopoles are presented. Numerical and experimental results are presented for an antenna configuration of 1/28 wavelength in diameter (ka∼0.1125). The antenna size including the ground plane is 60×38.5 mm2 for both antennas while their operating frequencies are 200 MHz and 179 MHz. The resonant frequency can be tuned over a good range of frequency without changing the antenna size, which can increase its usable bandwidth using reconfigurable antenna techniques.
{"title":"Split ring resonator-based miniaturized antennas","authors":"A. Eldek, F. Elhefnawi","doi":"10.1109/NRSC.2011.5873585","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873585","url":null,"abstract":"Two miniaturized microstrip-fed antennas composed of broadside coupled split ring resonators and excitation arc-shaped monopoles are presented. Numerical and experimental results are presented for an antenna configuration of 1/28 wavelength in diameter (ka∼0.1125). The antenna size including the ground plane is 60×38.5 mm2 for both antennas while their operating frequencies are 200 MHz and 179 MHz. The resonant frequency can be tuned over a good range of frequency without changing the antenna size, which can increase its usable bandwidth using reconfigurable antenna techniques.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"331 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":"114707516","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}
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