Delhi, India
Delhi, India

Time filter

Source Type

Singh A.K.,Mahatma Jyotiba Phule Rohilkhand University | Singh A.K.,Indian School of Mines | Gangwar R.K.,Indian School of Mines | Kanaujia B.K.,AIACTR
Microwave and Optical Technology Letters | Year: 2016

A novel and simple design of circularly polarized sectored annular ring microstrip antenna with coplanar and concentric circular microstrip antenna is presented. The proposed antenna has single microstrip line feed with defected ground structure. Simulation analysis has been carried out using Ansoft High Frequency Structure Simulator (HFSS™) software and measurement is carried out using the Agilent™ Vector Network Analyser (N5230A:PNA-L). Parametric analysis of return loss and axial ratio versus frequency for different physical parameter of antenna has been studied. Experimental results of the proposed antenna show the 34.61% impedance bandwidth and 8.08% axial ratio bandwidth at 2.6 GHz center frequency with 6.96 dB peak gain. Simulated results are in good agreement with measured results. Due to low profile and simple geometry, it can be applicable for S-band application effectively as wireless LAN, Wi-Fi, Bluetooth, Zig-Bee, and radio frequency identification antennas. © 2016 Wiley Periodicals, Inc.


Jain A.,Delhi Technological University | Saroha R.,Delhi Technological University | Pastor M.,Bundelkhand University | Jha A.K.,A.I.A.C.T.R. | Panwar A.K.,Delhi Technological University
Current Applied Physics | Year: 2016

Strontium and zirconium substituted barium titanate, Ba0.9Sr0.1Ti0.96Zr0.04O3 (BSZT) was prepared through the solid state reaction route. The compound was sintered for 6, 9 and 12 h and the effect of sintering duration has been studied. Structural investigation has been carried out using X-ray diffraction pattern of the samples following the Rietveld refinement, which confirms the formation of tetragonal phase with P4mm space group. The effect of Sr and Zr substitution in the BT lattice and effect of sintering duration in BSZT has been evaluated by Raman spectroscopy. The microstructural and dielectric studies show the increase in grain size as well as dielectric constant with increasing sintering duration. No appreciable change in Curie temperature (Tc) is observed for all three samples viz. BSZT6, BSZT9 and BSZT12. A decrease in activation energy and increase in diffusivity constant with increasing sintering duration is observed. I-V measurement was carried out to study the resistive properties of the synthesized compositions. © 2016 Elsevier B.V. All rights reserved.


Khari M.,AIACTR | Kumar P.,National Institute of Technology Tiruchirappalli
ACM International Conference Proceeding Series | Year: 2016

Automated software test data is a process of generating data that satisfies a given criterion. Search-based techniques are being effectively used in various fields of software engineering. Recently a new meta-heuristic search-based algorithm, cuckoo search, has been proposed. In this paper, we propose the application of this algorithm for generating test data. We validate the proposed algorithm against test functions and then compare its performance with those of Hill Climbing algorithms. The initial results prove the effectiveness of the proposed algorithm in test data generation. © 2016 ACM.


Saxena P.,Institute of Engineering and Technology | Ranjan R.,AIACTR | Gupta K.,Amity University
2016 1st International Conference on Innovation and Challenges in Cyber Security, ICICCS 2016 | Year: 2016

This paper presents the radiation performance of a modified elliptical patch microstrip antenna (EPMA) simulated on FR4 substrate. The elliptical microstrip antennas with small values of eccentricity have been employed to produce circular polarizations (CPs) with the use of single feed point. Theoretical model for an antenna is developed using modal cavity model and circuit theory concept. The arrangement of antenna resonates at four frequencies 5.75 GHz, 6.375 GHz, 8.25 GHz and 13.625 GHz, respectively. The first two frequencies are closely spaced and give an improved bandwidth. The results also show that the compactness is also obtained in the antenna structure. Details of the antenna design approach and theoretical results are presented and discussed systematically. © 2016 IEEE.


Sharma A.,AIACTR | Gupta S.K.,Ambedkar Polytechnic | Kanaujia B.K.,AIACTR | Pandey G.P.,MAIT
Proceedings - 4th International Conference on Computational Intelligence and Communication Networks, CICN 2012 | Year: 2012

This paper presents a novel slit cut circular patch antenna (SC-CPA) with supers rate. An analysis of triple band slit cut circular patch antenna with supers rate is presented and results are verified by simulation. Various parameters of antenna such as input impedance, return loss and gain are investigated. The parametric study of frequency response of antenna is carried out for different heights of dielectric supers rate or cover causing the lowering of the resonant frequencies. The proposed antenna possessing triple band characteristics and resonates at 7.2 GHz, 8.5 GHz, and 10 GHz. Antenna possess a peak gain of 2.15 dB with a compactness level of around 20%. Antenna is investigated to provide protection from environmental hazards and it is worth for triple band operations. © 2012 IEEE.


Gupta D.,LIBSYS Ltd | Gupta M.,AIACTR
International Conference on Recent Advances and Innovations in Engineering, ICRAIE 2014 | Year: 2014

Swarm based algorithms with features like easy implementation; self-organization and decentralization have led to emergent behavior successful in bridging the gap from idealistic situation to reality. Firefly Algorithm is one such new nature-inspired metaheuristic algorithms used for solving various optimization problems. It mimics the flashing behaviour of fireflies at night and was first proposed in 2008. In this work, performance of a new modified version of Firefly algorithm (MoFA) is compared with standard FA and two more versions of FA on various parameters. Results demonstrate that the new modified algorithm is superior to all the other three algorithms in all aspects. © 2014 IEEE.


Yaduvanshi R.S.,AIACTR
International Journal of Ultra Wideband Communications and Systems | Year: 2012

A hybrid magneto-hydrodynamic antenna consisting of one copper annular ring loaded with dielectric resonator has been biased with DC voltage and magnetic fields. RF input and DC bias voltage has been applied in x direction and magnetic field B has been given in y direction. Propylene polymer pipes (PPR) cylindrical tube filled with mixture of barium strontium titanate (BSTO) and silicone oil is placed on the concentric copper annular ring. Mathematical coupled solution of Maxwell's and Navier Stroke's equations have been worked for this geometry. A new antenna parameter, i.e., velocity field (v) has been found to be contributing to the Poynting vector solution to this class of antennas. Velocity field (v) has become integral part along with E and H fields for computing Poynting vector. Hence, PPR geometry, fluid volume, copper annular ring radius, fluid permittivity, electric filed (E), magnetic field (H) and velocity (v) becomes the function of antenna resonant frequency and radiation patterns. A prototype antenna has been designed. Simulations based on HFSS have been presented. Both type results were compared. More than 4.5 GHz ultra large bandwidth and 17 dB gain has been reported in the results. © 2012 Inderscience Enterprises Ltd.


Gupta C.,A.I.A.C.T.R. | Gupta K.,IGIT | Gupta V.,A.I.A.C.T.R.
Proceedings - 2012 International Symposium on Instrumentation and Measurement, Sensor Network and Automation, IMSNA 2012 | Year: 2012

Security is an inevitable part in this world connected via internet. As the connectivity increases, the concern over securing one's data also increases. Sensor Network also requires security for its own network and data. In this paper we will discuss various issues in security of sensor network and various other constraints that pose a challenge to us while securing the data and network. Then we will discuss several threats and their possible solutions which are in existence for Sensor Network. © 2012 IEEE.


Tulsani H.,AIACTR | Gupta R.,AIACTR
Proceedings - 2014 3rd International Conference on Reliability, Infocom Technologies and Optimization: Trends and Future Directions, ICRITO 2014 | Year: 2015

In this paper, a wavelet based technique for denoising of one dimensional signals is proposed which employs artificial bee colony (ABC) algorithm for optimizing a new polynomial threshold function. The coefficients of the threshold function are optimized dynamically to maximize the output signal to noise ratio (SNR). ABC algorithm calculates the coefficients for maximum output SNR. The proposed technique is tested for three artificial signals, namely blocks, bumps and Doppler signals. Additive white Gaussian noise (AWGN) is added to the signals and the results of denoising are presented. The results are compared with hard, soft and non-negative garrote threshold functions for universal threshold (VisuShrink) at different levels of decomposition. The performance of the algorithm is compared using different parameters such as input and output SNR, cross correlation coefficient and mean square error. The results show that the proposed algorithm provides better denoising results in all respects. © 2014 IEEE.


Garg N.,AIACTR | Kumar S.,AIACTR
2013 4th International Conference on Computing, Communications and Networking Technologies, ICCCNT 2013 | Year: 2013

Free Space Optical Communication become more and more popular due to its advantage over Radio Frequency Communication. In this paper BER and Q-factor is observed at different parameters. It is observed that BER is increased with increase in distance and Q-factor is decreased with increase in distance. BER and Q-factor is also affected by Bit Rate and Divergence. If Bit rate and Divergence is increase BER will increased and Q-factor is decreased. It is observed that with Mach-Zehnder optical modulator we get a BER of 10 -20 at a distance of 1.8 km with bit rate 2.5 Gbps and Q-factor 30 is achieved at a distance of 1.6 km with 2.5 Gbps bit rate. © 2013 IEEE.

Loading AIACTR collaborators
Loading AIACTR collaborators