Ludhiāna, India
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Inamdar K.,ECED | Kosta Y.P.,MEF | Patnaik S.,St Xaviers Institute Of Engg
Proceedings on 2014 2nd International Conference on "Emerging Technology Trends in Electronics, Communication and Networking", ET2ECN 2014 | Year: 2015

Metamaterials which are formed by embedding inclusions and material components in the host media to achieve composite media that may be engineered to have qualitatively new physically realizable response functions that do not occur or may not be easily available in nature, have raised a great deal of interest in recent years. The potential ability to engineer materials with desired electric and magnetic properties to achieve unusual effects offers a great deal of excitement and promise to the scientific and engineering community. Several unusual shapes have been experimented upon by researchers leading to expansion of the world of negativity. In this paper one such shape namely 'AV' shape has been presented. Its permittivity and permeability are extracted and studied. © 2014 IEEE.


Kumar R.,ECED | Khanna R.,Thapar University
Proceedings - 2012 IEEE Int. Conf. on Green Computing and Communications, GreenCom 2012, Conf. on Internet of Things, iThings 2012 and Conf. on Cyber, Physical and Social Computing, CPSCom 2012 | Year: 2012

QoS means providing consistent, predictable data delivery service. QoS is dealt with providing real-time (e.g., voice) as well as non-real-time services. Real time services are required to be more dominant over non real time for QoS prospective. In this paper a fuzzy based approach is presented using ns-2 for handover between UMTS and WLAN networks. It has been observed that the results obtained with proposed approach are improved and better than the conventional approach. © 2012 IEEE.


Dwivedi S.,ECED | Mishra V.,ECED | Kosta Y.P.,Marwadi Education Foundations Group of Institutions
Proceedings on 2014 2nd International Conference on "Emerging Technology Trends in Electronics, Communication and Networking", ET2ECN 2014 | Year: 2015

This paper presents the design issues, modeling, fabrication and characterization of a radome structure, a metamaterial cover over the slotted patch antenna for triband operation with center frequency 2.45 GHz. The dimensions of the slots patterned over the patch antenna are designed to control the lower resonant frequency and the bandwidth. The paper presents the selection of the best optimized dimensions of the slotted patch antenna and metamaterial cover to control the resonant frequencies and bandwidth of the antenna. The experimental results are presented thoroughly and compared with the analytical calculations. An analytical method, Newton's divided difference method is utilized to predict the features of the simulation results, implying that within a certain frequency range, the spatial height of the metamaterial cover can be adjusted for maximum directivity attainment. Negative value of permittivity and permeability are obtained due to the use of metametarial cover over the patch antenna. S-parameters, directivity and radiation patterns as performance matrices are obtained using the software tool High Frequency Structure Simulator version 11. These parameters are used to retrieve the effective permittivity and permeability. Numerous simulations have been carried out for different heights of the cover from the patch antenna in the microwave regime. The optimally simulated structure is proposed for the application of metamaterials as antenna cover to primarily enhance directivity by minimizing its refractive index in negative regime. Further design includes review and critical discussions on the effect of using different substrate materials for the patch antenna. © 2014 IEEE.


Kundalia S.,Atmiya Institute of Technology and Science | Unadkat V.,Atmiya Institute of Technology and Science | Dwivedi S.,ECED
Proceedings on 2014 2nd International Conference on "Emerging Technology Trends in Electronics, Communication and Networking", ET2ECN 2014 | Year: 2015

A compact multiband fractal antenna based on the nested geometry is proposed and designed in this paper. The paper depicts the design optimization of the nested geometries for multiband characteristics. The antenna is fed by discrete port. The design is obtained at the center frequency 2.5GHz. Moreover the effect of truncation in nested geometry is observed. The modification in geometry is introduced using DGS structure in the ground plane. The enhancement in the operating bands is observed by above geometry. Operating frequency bands are adjusted by variations in design parameters. Multiband functionality is observed in all the designs presented in this paper. By alterations in the geometry of this antenna various operating frequencies are achieved which are applicable to more than one applications. Gain and Directivity are stabilized to large extent. Improvement in the return loss and VSWR is observed. These antenna designs are thoroughly simulated on FR-4 substrate with loss tangent 0.025 and dielectric constant 4.3 and analyzed using Computer Simulation Technology Microwave Studio. These designs are applicable to L-band and S-band for mobile satellite services, navigation (GPS) and handheld terminals. © 2014 IEEE.


Gupta A.,ECED | Chawla P.,ECED
Proceedings on 2015 1st International Conference on Next Generation Computing Technologies, NGCT 2015 | Year: 2015

In this article, the latest development in the field of fractal antenna engineering are theoretically as well as structurally reviewed and its future scope is discussed. Fractal has unique property that it can make copies of itself at different scales. The concept of fractal antenna is very old but designing for broadband application is quite new. A novel modified star triangular fractal (MSTF) is proposed in this paper. The antenna utilized a coaxial feeding technique and simultaneously possesses multiband, almost uniform radiation, and low profile. The purpose of this paper is to provide the simulated data on modified star-triangular fractal monopole antenna using HFSS based on different feeding techniques. Here we are comparing two feeding techniques and their respective effects on radiation pattern. By the use of microstrip feeding there is ultra-wide band application and in coaxial feeding generates multiband applications. © 2015 IEEE.


Dwivedi S.,ECED | Mishra V.,ECED
2013 IEEE Applied Electromagnetics Conference, AEMC 2013 | Year: 2013

A novel approach of analytically and numerically calculating the relationship of directivity with the spacing height of copper grid layer over the patch, termed as radome structure by the present team of authors is presented. Numerous designs and models of radome structure are conceptually solved and evaluated using finite element method (FEM) based High Frequency Structure Simulator (HFSS) software tool. Single copper grid layer over the patch antenna for achieving high directivity is described. Newton's divided difference method is applied on the radome structure for evaluating the performance parameters of the antenna. A global formula is developed to indicate the relationship of the directivity with the spacing height of the patch antenna by varying the distance of copper grid layer and observing its effect on the directivity of the patch using electromagnetic wave solver HFSS. © 2013 IEEE.


Patel J.N.,ECED | Patnaik S.,ECED | Murali D.,ECED
Journal of Next Generation Information Technology | Year: 2012

In last decade the transmission of image over wireless network has become challenging. Compressed bit stream of image/video need less storage and bandwidth but highly sensitive to propagation of errors. So error control is an important technique in image/video transmission. This paper proposed multilayered bit stream of JPEG coded image transmission through wireless channel (SUI) using Unequal Error Protection (UEP). The Protection level will be decided based on the importance of layer in retrieval of image. The JPEG image data stream is partitioned into three layers: 1) DC coefficients 2) High informative AC coefficients 3) Low informative AC coefficients. Even with strong error protection applied, in higher noisy environment undetected block error still exists in transmission stream which degrades the image quality. So it requires repairing of block errors. For repairing of block errors first the damaged blocks are detected then repaired using linear interpolation. The simulation results shows quality of recovered image can be improved using different error controlling techniques like UEP and error concealment.


Jain A.,ECED
Proceedings on 2012 1st International Conference on Emerging Technology Trends in Electronics, Communication and Networking, ET2ECN 2012 | Year: 2012

The recent advances in signal processing techniques as well as the VLSI circuits that can handle orders of calculations, have led to rather more efficient and faster data communications possible. This is quite visible with the introduction of 4G wireless services, which introduce OFDM/OFDMA that are quite complex in computations, but are handled easily by the existent technologies. But, with such high processing, battery discharge becomes another issue. Especially when the mobile stations (MS) are experiencing highly mobile environments, it becomes a serious issue. In this paper the upshot of power optimization in Mobile stations has been observed, optimized and simulated. This paper utilizes the rich topic of Multi-hop relay communications and compares their battery utilizations with the existent network topology under highly mobile environments. Qualnet 5.1 Network Simulator has been used to design and test the network topologies and henceforth acquire the generated data. Also a heterogeneous network topology is proposed and it's certain discernible advantages over existing and other heterogeneous networks have been mentioned. © 2012 IEEE.


Sharma S.,ECED
Computers and Mathematics with Applications | Year: 2012

It has been shown that when perfect or partial channel state information (CSI) is available at the transmitter, the performance and capacity of a space-time coded system can be further improved. Multilevel space-time trellis codes (MLSTTC's) are capable of simultaneously providing bandwidth efficiency, diversity improvement and coding gain with significantly reduced decoding complexity, especially for larger constellations and higher throughputs. In this paper, we present a design of combined multilevel space-time trellis codes and beam forming based on feedback from receiver, henceforth referred to as weighted multilevel space-time trellis codes (WMLSTTCs). The channel profile is used to provide a beam forming scheme that achieves the better performance by properly weighting transmitted signals. Weights are selected that matches best with a channel profile feedback from the receiver indicative of long-term characteristics of the wireless channel. WMLSTTCs provide improvement in performance of MLSTTCs. © 2011 Elsevier Ltd. All rights reserved.


Inamdar K.,ECED | Kosta Y.P.,MEFGI | Patnaik S.,St Xaviers Institute Of Engineering
Progress in Electromagnetics Research Symposium | Year: 2014

In this paper, we present the design of a metamaterial based microstrip patch antenna, optimized for bandwidth and multiple frequency operations. A Criss-Cross structure has been proposed, this shape has been inspired from the famous Jerusalem Cross. The theory and design formulas to calculate various parameters of the proposed antenna have been presented. Design starts with the analysis of the proposed unit cell structure, and validating the response using software - HFSS Version 13, for obtaining negative response of ε and μ - metamaterial. Following this, a metamaterial-based-microstrip-patch-antenna is designed. A detailed comparative study is conducted exploring the response of the designed patch made of metamaterial and that of the conventional patch. The unique shape proposed in this paper gives improvement in bandwidth without reducing the gain of the antenna. The C-band of the frequency spectrum has been chosen for all the above mentioned exercise as it is the most popular band for commercial, satellite and radar applications. The proposed metamaterial based antenna can be utilized for higher gain and bandwidth requirements in any of these applications.

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