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Effects of microstrip feed line width on 1 £ 4 rectangular microstrip antenna array electrical parameters and estimation with artificial neural networks

Effects of microstrip feed line width on 1 £ 4 rectangular ...

引用

Progress in Electromagnetics Research Symposium, PIERS 2012 Kuala Lumpur

作者： Dundar, O. Uzer, D. Gultekin, S.S. Bayrak, M. Electronic Communication Program Eregli Kemal Akman Technical Vocational School of Higher Education Selcuk University Konya Turkey Department of Electrical and Electronics Engineering Faculty of Engineering-Architecture Selcuk University Konya Turkey Department of Electrical and Electronics Engineering Faculty of Engineering Mevlana University Konya Turkey

ISBN: (纸本)9781934142202

In this study, 1 £ 4 rectangular microstrip array antennas are designed at 16 GHz resonant frequency for KU Band usage on Duroid 5880 substrate that has a thickness of 0.254mm and a dielectric constant of *** are simulated using HFSS *** these designs, by changing the feed line widths systematically, for each antenna, electrical parameters like S11 response, directivity, gain, radiation efficiency *** investigated for 26 array antennas in simulation ***, directivity and gain values are predicted with an Artificial Neural Network *** network has four inputs as dielectric substrate thickness, resonant frequency and dielectric constant of the substrate and three outputs as directivity, gain and radiation *** perceptron structure for Artificial Neural Network model and Levenberg- Marquart learning algorithm for training the network are *** network model is trained with 20 of 26 design data and is tested with the rest 6 *** is seen that the results from simulations and the neural network model are compatible with similar studies in the literature.

关键词： Natural frequencies

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Prospects and limitations of Organic Thin Film Transistors (OTFTs)

Prospects and limitations of Organic Thin Film Transistors (...

引用

2nd International Conference on Computer Science, engineering and Applications, ICCSEA 2012

作者： Kaushik, B.K. Kumar, Brijesh Negi, Y.S. Mittal, Poornima Department of Electronics and Computer Engineering Indian Institute of Technology Roorkee 247667 India Polymer Science and Technology Program DPT Indian Institute of Technology Roorkee 247667 India Department of Electronics and Communication Engineering Graphic Era University Dehradun 248001 India

ISBN: (纸本)9783642301100

Organic Transistor (OT) modeling, fabrication and applicability has undergone remarkable progress during last ten years. Organic Thin Film Transistors (OTFTs) have received significant attention recently because of their considerable utility. They can be fabricated at lower temperature and significantly reduced cost as compared to Hydrogenated Amorphous Silicon Thin Film Transistors (a-Si: H TFTs). Fabrication of OTFTs at low temperature allows utilization of wide range of substrates, thereby permitting usage of organic transistors as future candidate for many low-cost electronics applications that require flexible polymeric substrates such as RFID tags, smart cards, electronic paper, and active matrix flat panel displays. This paper provides detailed insight of OTFTs, their operating principles, device materials and various structures such as Top Gate Top Contact (TGTC), Top Gate Bottom Contact (TGBC), Bottom Gate Top Contact (BGTC) and Bottom Gate Bottom Contact (BGBC). Although OTFTs find tremendous and widespread applications, but is marred by few limitations related to factors such as speed, compatibility, stability, degradability and variability. This paper comprehensively discusses the performance and limitations of OTFTs. © 2012 Springer-Verlag GmbH.

关键词： Electronic paper

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Hyperspectral band referencing based on correlation structure

Hyperspectral band referencing based on correlation structur...

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2012 IEEE International Conference on Control System, Computing and engineering, ICCSCE 2012

作者： Ahmed, Ayman Mahmoud Elramly, Salwa Sharkawy, Mohamed El. Egyptian Space Program National Authorty for Remote Sensing and Space Science Cairo Egypt Department of Electronics and Communication Engineering Ain-Shams University Cairo Egypt E-JUST-Egypt-Japan University of Science and Technology New Borg El Arab Alexandria Egypt

ISBN: (纸本)9781467331432

Hyperspectral imaging has been widely studied in many applications;notably in climate changes, vegetation, and desert studies. However, such kind of imaging brings a huge amount of data, which requires transmission, processing, and storage resources for both airborne and space borne imaging. Compression of hyperspectral data cubes is an effective solution for these problems. Lossless compression of the hyperspectral data usually results in low compression ratio, which may not meet the available resources;on the other hand, lossy compression may give the desired ratio, but with a significant degradation effect on object identification performance of the hyperspectral data. Moreover, most hyperspectral data compression techniques exploits the similarities in spectral dimensions;which requires bands reordering or regrouping, to make use of the spectral redundancy. In this paper, we analyze the spectral cross correlation between bands for AVIRIS and Hyperion hyperspectral data;spectral cross correlation matrix is calculated, assessing the strength of the spectral matrix, and finally, we propose new technique to find highly correlated groups of bands in the hyperspectral data cube based on 'inter band correlation square' referencing. © 2012 IEEE.

关键词： Hyperspectral imaging

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Amplitude and Frequency Modulation behaviours of Cellular Neural Networks

Amplitude and Frequency Modulation behaviours of Cellular Ne...

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IEEE International Symposium on Innovations in Intelligent Systems and Applications (INISTA)

作者： Baran Tander Atilla Özmen Vocational School of Technical Sciences Communication Electronics Program Kadir Has University Selimpasa Istanbul Turkey School of Engineering Electronics Engineering Department Kadir Has University Cibali Istanbul Turkey

As is well known, Amplitude Modulation (AM) and Frequency Modulation (FM) are the most popular modulation techniques in communications [1]. Classically, they are designed as individual systems at transmitters; however in this study, it is shown that, both can be realized under a single architecture, specifically on a Cellular Neural Network with an opposite sign template (CNN-OST). First, the CNN-OST is introduced and then, AM and FM behaviours of this structure are explained. Simulations are carried out where satisfactory results are found and finaly, the advantages and drawbacks of the proposed system are discussed.

关键词： Frequency modulation Cellular neural networks Mathematical model Partial differential equations Educational institutions Oscillators

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Cluster-based spectrum sensing for cognitive radios with imperfect channel to cluster-head

Cluster-based spectrum sensing for cognitive radios with imp...

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IEEE Conference on Wireless communications and Networking

作者： Mahdi Ben Ghorbel Haewoon Nam Mohamed-Slim Alouini Electrical Engineering Program King Abdullah University for Science and Technology Thuwal Makkah Saudi Arabia Electronics and Communication Engineering Hanyang University Ansan South Korea

Spectrum sensing is considered as the first and main step for cognitive radio systems to achieve an efficient use of spectrum. Cooperation and clustering among cognitive radio users are two techniques that can be employed with spectrum sensing in order to improve the sensing performance by reducing miss-detection and false alarm. In this paper, within the framework of a clustering-based cooperative spectrum sensing scheme, we study the effect of errors in transmitting the local decisions from the secondary users to the cluster heads (or the fusion center), while considering non-identical channel conditions between the secondary users. Closed-form expressions for the global probabilities of detection and false alarm at the cluster head are derived.

关键词： Signal to noise ratio Sensors Cognitive radio Error probability Shadow mapping Binary phase shift keying Fading

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Hyperspectral band referencing based on correlation structure

Hyperspectral band referencing based on correlation structur...

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IEEE International Conference on Control System, Computing and engineering (ICCSCE)

作者： Ayman Mahmoud Ahmed Salwa ElRamly Mohamed El. Sharkawy Egyptian Space Program National Authority for Remote Sensing and Space Sciences Cairo Egypt Egyptian Space Program National Authorty for Remote Sensing and Space science Cairo Egypt Department of Electronics and Communication Engineering Ain-Shams University Cairo Egypt E-JUST–Egypt-Japan University of science and technology Alexandria Egypt

Hyperspectral imaging has been widely studied in many applications; notably in climate changes, vegetation, and desert studies. However, such kind of imaging brings a huge amount of data, which requires transmission, processing, and storage resources for both airborne and space borne imaging. Compression of hyperspectral data cubes is an effective solution for these problems. Lossless compression of the hyperspectral data usually results in low compression ratio, which may not meet the available resources; on the other hand, lossy compression may give the desired ratio, but with a significant degradation effect on object identification performance of the hyperspectral data. Moreover, most hyperspectral data compression techniques exploits the similarities in spectral dimensions; which requires bands reordering or regrouping, to make use of the spectral redundancy. In this paper, we analyze the spectral cross correlation between bands for AVIRIS and Hyperion hyperspectral data; spectral cross correlation matrix is calculated, assessing the strength of the spectral matrix, and finally, we propose new technique to find highly correlated groups of bands in the hyperspectral data cube based on “inter band correlation square” referencing.

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Efficient scheduling request algorithm for opportunistic wireless access

Efficient scheduling request algorithm for opportunistic wir...

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2011 IEEE MTT-S International Microwave Workshop Series on Intelligent Radio for Future Personal Terminals, IMWS-IRFPT 2011

作者： Nam, Haewoon Alouini, Mohamed-Slim Department of Electronics and Communication Engineering Hanyang University Ansan Korea Republic of Electrical Engineering Program KAUST Thuwal Makkah Province Saudi Arabia

ISBN: (纸本)9781457709630

An efficient scheduling request algorithm for opportunistic wireless access based on user grouping is proposed in this paper. Similar to the well-known opportunistic splitting algorithm, the proposed algorithm initially adjusts (or lowers) the threshold during a guard period if no user sends a scheduling request. However, if multiple users make requests simultaneously and therefore a collision occurs, the proposed algorithm no longer updates the threshold but narrows down the user search space by splitting the users into multiple groups iteratively, whereas the opportunistic splitting algorithm keeps adjusting the threshold until a single user is found. Since the threshold is only updated when no user sends a request, it is shown that the proposed algorithm significantly alleviates the burden of the signaling for the threshold distribution to the users by the scheduler. More importantly, the proposed algorithm requires a less number of mini-slots to make a user selection given a certain scheduling outage probability. © 2011 IEEE.

关键词： Scheduling

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Organic Thin Film Transistor architecture, parameters and their applications

Organic Thin Film Transistor architecture, parameters and th...

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International Conference on communication Systems and Network Technologies

作者： Mittal, Poornima Kumar, Brijesh Negi, Y.S. Kaushik, B.K. Singh, R.K. Electronics and Communication Engineering Graphic Era University-Dehradun Dehradun India Polymer Science and Technology Program DPT Indian Institute of Technology-Roorkee Roorkee India Department of Electronics and Computer Engineering Indian Institute of Technology-Roorkee Roorkee India Electronics and Communication Engineering Uttarakhand Technical University-Dehradun Dehradun India

ISBN: (纸本)9780769544373

Organic Thin Film Transistors (OTFTs) are promising devices for future development of variety of low-cost and large-area electronics applications such as flexible displays. This paper analyzes the performance of OTFT made of several organic semiconducting and insulating materials and further discusses their applications. Analysis of previous research work demonstrates that the mobility in OTFT decreases when the product of semiconducting film thickness and gate capacitance per unit area increases. The decrease is specified by a power law function with parameters for several organic semiconductors. OTFT characteristics have undergone spectacular improvements during the last few years. This paper explores the effect of variation of channel length from 40 nm to 20 nm on drain current for pentacene bottom contact structure. Variations in these quantities maps to variations in the electrical behaviour of devices. It has been found that drain current increases due to decrease in length of organic thin film conducting channel. It reviews recent progress in parameter properties for device designs and applications related to OTFTs. The performance of OTFTs is evaluated in terms of mobility, on/off current ratio, threshold voltage and sub threshold slope. This paper thoroughly discusses the overall performance and applications of OTFTs in various fields. © 2011 IEEE.

关键词： Drain current

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GaAs nanowhiskers for femtosecond photodetectors and THz emitters

GaAs nanowhiskers for femtosecond photodetectors and THz emi...

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International Conference on Advanced Semiconductor Devices and Microsystems (ASDAM)

作者： M. Mikulics J. Zhang R. Sobolewski R. Adam L. Juul M. Marso A. Winden H. Hardtdegen D. Grützmacher P. Kordoš Peter Grünberg Institut (PGI) Forschungszentrum Jülich (KFA) Julich Germany Department of Electrical and Computer Engineering and Laboratory for Laser Energetics University of Rochester Rochester NY USA Department of Electrical and Computer Engineering and Laboratory for Laser Energetics Department of Physics and Astronomy and Materials Science Program University of Rochester Rochester NY USA Faculté des Sciences de la Technologie et de la Communication Université du Luxembourg Luxembourg Institute of Electrical Engineering Institute of Electronics and Photonics Slovak Academy of Sciences Bratislava Slovakia

We have developed and characterized ultrafast and highly sensitive photodetectors based on GaAs nanowhiskers fabricated with an improved top-down etching method. We evaluated the material properties of the etched nanowhiskers by micro photoluminescence measurements and studied the effect of post annealing on nanowhiskers' luminescence. The nanowhiskers were integrated into the coplanar striplines for device testing using DC and time-resolved electro-optic characterization techniques. Our photodetectors exhibit a very low dark current below 500 pA at 10 V bias as well as a high responsivity of 0.19 A/W at 30 V, and a cut-off frequency of 1.3 THz. These characteristics make the GaAs nanowhisker photodetectors very promising candidates for high-speed optoelectronics and efficient THz emitters.

关键词： Gallium arsenide Photodetectors Annealing Etching Semiconductor device measurement Fabrication Nanoscale devices

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Adaptive rate transmission for spectrum sharing system with quantized channel state information

Adaptive rate transmission for spectrum sharing system with ...

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Annual Conference on Information Sciences and Systems

作者： Abdallah, Mohamed Salem, Ahmed Alouini, Mohamed-Slim Qaraqe, Khalid A. Electrical and Computer Engineering Texas A and M University at Qatar PO Box 23874 Doha Qatar Department of Electronics and Electrical Communication Cairo University Giza Egypt Electrical Engineering Program KAUST Thuwal Saudi Arabia

ISBN: (纸本)9781424498475

The capacity of a secondary link in spectrum sharing systems has been recently investigated in fading environments. In particular, the secondary transmitter is allowed to adapt its power and rate to maximize its capacity subject to the constraint of maximum interference level allowed at the primary receiver. In most of the literature, it was assumed that estimates of the channel state information (CSI) of the secondary link and the interference level are made available at the secondary transmitter via an infinite-resolution feedback links between the secondary/primary receivers and the secondary transmitter. However, the assumption of having infinite resolution feedback links is not always practical as it requires an excessive amount of bandwidth. In this paper we develop a framework for optimizing the performance of the secondary link in terms of the average spectral efficiency assuming quantized CSI available at the secondary transmitter. We develop a computationally efficient algorithm for optimally quantizing the CSI and finding the optimal power and rate employed at the cognitive transmitter for each quantized CSI level so as to maximize the average spectral efficiency. Our results give the number of bits required to represent the CSI sufficient to achieve almost the maximum average spectral efficiency attained using full knowledge of the CSI for Rayleigh fading channels. © 2011 IEEE.

关键词： Channel state information

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