Ambedkar Institute of Advanced Communication Technologies and Research

Delhi, India

Ambedkar Institute of Advanced Communication Technologies and Research

Delhi, India

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Gautam A.K.,G B Pant Engineering College | Yadav S.,G B Pant Engineering College | Kanaujia B.K.,Ambedkar Institute of Advanced Communication Technologies and Research
IEEE Antennas and Wireless Propagation Letters | Year: 2013

A novel coplanar waveguide (CPW)-fed compact ultrawideband (UWB) microstrip antenna is proposed for ultrawideband applications. The proposed antenna posseses a method to minimize the monopole antenna by loading of inverted L-strip over the conventional monopole patch antenna to lower the height of the antenna. The ground was vertically extended toward two sides of the single radiator. Therefore, the large space around the radiator that is usually wasted can be effectively saved. The antenna is practically fabricated and simulated. Measured results show a good agreement with simulated results. The prototype with overall size of 25 × 25 × 1.6 mm3 achieves good impedance matching, constant gain, stable radiation patterns, and constant group delay over an operating bandwidth of 2.6-13.04 GHz (10.44 GHz). © 2013 IEEE.


Khandelwal M.K.,Ambedkar Institute of Advanced Communication Technologies and Research | Kanaujia B.K.,Ambedkar Institute of Advanced Communication Technologies and Research | Gautam A.K.,G B Pant Engineering College
Microwave and Optical Technology Letters | Year: 2013

A low profile Log-Periodic dipole microstrip antenna is proposed for ultrawideband (UWB) applications. Logarithmically scaled dipoles with defected ground plane are fabricated on both of the sides of the dielectric substrate. The triangular taper transition is used for providing better matching. The proposed antenna shows an impedance bandwidth of 3.3-20.7 GHz, which covers the entire C, X, and Ku bands and partially S and K bands. The antenna shows stable radiation characteristics with a good front-to-back ratio for entire operating band. Further, a U-shaped slot is integrated with the UWB antenna to provide a rejection function at narrowband wireless communication system such as IEEE 802.11a in USA (5.150-5.350 GHz and 5.725-5.825 GHz). The notched band is created at 5.8 GHz. The measured results reveal that the proposed antenna offers a very wide bandwidth with notched band at 5.8 GHZ. Copyright © 2013 Wiley Periodicals, Inc.


Gautam A.K.,G B Pant Engineering College | Kunwar A.,G B Pant Engineering College | Kanaujia B.K.,Ambedkar Institute of Advanced Communication Technologies and Research
IEEE Antennas and Wireless Propagation Letters | Year: 2014

A novel single-feed arrowhead-shape slotted microstrip antenna for circular polarization (CP) is proposed. To achieve CP radiation and antenna size reduction, an arrowhead-shaped slot is embedded in the first quadrant along the diagonal axes of a square patch. Thus, the structure is asymmetric, and good-quality CP performance can be achieved by adjusting the size of the slot. The antenna is simulated and practically fabricated. Measured results confirm the validity of this design and show a good agreement with simulated results. The antenna generates CP radiation at 911 MHz with an overall size of 87\,\times \, 87\, \times \, 4.572 mm3. The fabricated antenna shows an impedance bandwidth of 35.0 MHz (888.0-923.0 MHz) with 8.0 MHz (908.0-916.0 MHz) 3-dB axial-ratio bandwidth (ARBW). © 2002-2011 IEEE.


Gautam A.K.,Gb Pant Engineering College | Kr Kanaujia B.,Ambedkar Institute of Advanced Communication Technologies and Research
Microwave and Optical Technology Letters | Year: 2013

A novel dual-band asymmetric slit with defected ground structure microstrip antenna for circular polarization (CP) operation is proposed. In which, the lower resonant band is excited by cutting asymmetric slit on square microstrip antenna, and a new concept of defected ground with truncated corners structure is used to excite upper resonant band. The antenna is practically fabricated and simulated. Measured results show a good agreement with simulated results. Antenna is compact in size and shows a good quality of polarization at both resonant bands. Antenna shows the bandwidth of 7.5% (2.30-2.48 GHz) and 2.94% (3.80-3.9 GHz) at lower and upper bands, respectively. The antenna also shows 40 and 11 MHz, 3-dB axial ratio bandwidth at lower and upper bands, respectively. The return loss and radiation pattern of the proposed antenna remain consistent for both resonant bands. Copyright © 2013 Wiley Periodicals, Inc.


Singhi M.,Ambedkar Institute of Advanced Communication Technologies and Research | Fahim M.,University of Delhi
Polymer Composites | Year: 2012

In this work, a series of polymer composites was prepared by in situ polymerization of methylmethacrylate (MMA) as a monomer and sonicated nanographite particles (∼400 nm) as conductive fillers. The concentration of nanographite particles was changed in the step of 0.25 wt% in the monomer and five composites having a filler concentration of 0.25, 0.50, 0.75, 1, and 1.5 wt% respectively were prepared. The composites were characterized for their morphology, thermal, and dielectric behavior. Room temperature dielectric behavior of the composites was studied at six different frequencies of 100 Hz, 1, 10, 100, 500 kHz, and 1 MHz. Temperature-dependent dielectric properties was studied in the temperature range from 30 to 150°C at the above frequencies. It was interesting to note that at room temperature dielectric constant (ε′) decreased with increasing concentration of nanographite and reached a minimum at a filler concentration of 0.75 wt%. Dielectric relaxation behavior was observed in the temperature versus tan δ curves. The dielectric peak shifted to higher temperatures with increase in frequency and vice-versa. © 2012 Society of Plastics Engineers.


Rai S.,Ambedkar Institute of Advanced Communication Technologies and Research
2014 International Conference on Signal Propagation and Computer Technology, ICSPCT 2014 | Year: 2014

Metamorphic malwares are one of the most deceiving category of malwares inspired from a natural phenomenon of camouflaging. The variation occurs in appearance only without interfering with the core element or properties of subject. It is implemented by utilizing simple code obfuscation techniques like dead code, sequence reordering etc. Nevertheless, Anti-Virus (AV) companies are struggling to tackle this strategy of malware writers due to incompetent syntactic signature pattern based detection. This paper discusses feasibility of malware evasion from detectors and a comparative study of detection methods to deal with metamorphic malware such as Zero transform, Hidden Markov Model, semantic analysis etc.is presented. In this paper, I propose an approach for combining value analysis of registers with other similarity based techniques for improved rate of detection with reduced false negative. © 2014 IEEE.


Jain A.,Ambedkar Institute of Advanced Communication Technologies and Research
Wireless Networks | Year: 2015

Network lifetime is the key design parameter for wireless sensor network protocols. In recent years, based on energy efficient routing techniques numerous methods have been proposed for enhancing network lifetime. These methods have mainly considered residual energy, number of hops and communication cost as route selection metrics. This paper introduces a method for further improvement in the network lifetime by considering network connectivity along with energy efficiency for the selection of data transmission routes. The network lifetime is enhanced by preserving highly connected nodes at initial rounds of data communication to ensure network connectivity during later rounds. Bassed on the above mentioned concept, a connectivity aware routing algorithm: CARA has been proposed. In the proposed algorithm, connectivity factor of a node is calculated on the basis of Betweenness centrality of a node and energy efficient routes are found by using fuzzy logic and ant colony optimization. The simulation results show that the proposed algorithm CARA performs better than other related state-of-the-art energy efficient routing algorithms viz. FML, EEABR and FACOR in terms of network lifetime, connectivity, energy dissipation, load balancing and packet delivery ratio. © 2015 Springer Science+Business Media New York


Yadav S.,Ambedkar Institute of Advanced Communication Technologies and Research
2014 International Conference on Computing for Sustainable Global Development, INDIACom 2014 | Year: 2014

Worms are common phenomenon in today's internet and cause tens of billions of dollars in damages to business around the world each year. In this study author first discuss about Worms, then gave a life-cycle of worm and a brief discussion about different stages of worm life cycle. Finally author gave a broad overview of target finding schemes (blind scan, hit-list and passive scheme) and finally made a comparison between various target finding schemes based on three parameters (no. of initially infected hosts, scan rate and hitting probability). This article explores all the current schemes used by internet worm to discover their victim host. This article is efficient both in research point of view as well as for the benefit of students because a vast list of target finding schemes used by worms discussed here. © 2014 IEEE.


Pandey V.,Ambedkar Institute of Advanced Communication Technologies and Research
International Conference on Computing, Communication and Automation, ICCCA 2015 | Year: 2015

Speech signal varies from a frequency range of 300Hz to 4000Hz and can be filtered using various types of filters. This paper demonstrates the design of Equiripple Bandpass FIR filter specific to the application of speech signal by optimizing the order, first stopband frequency and second stopband frequency of the filter simultaneously using MATLAB Filter Design & Analysis Tool and mathematical computations for a range of values. A 3-dimensional data analysis approach has been considered to design the required stable filter. © 2015 IEEE.


Jain S.,Ambedkar Institute of Advanced Communication Technologies and Research | Bhatnagar V.,Ambedkar Institute of Advanced Communication Technologies and Research
Proceedings of the 2014 International Conference on Issues and Challenges in Intelligent Computing Techniques, ICICT 2014 | Year: 2014

In today's era Information technology is growing day by day. The rate of information storage and transformation is growing day by day. So information security is becoming more important. Everyone wants to protect its information from attackers and hackers. To provide security to information there are various algorithms of traditional cryptography and steganography. New field DNA cryptography emerges to provide security to data store in DNA. The DNA cryptography uses the Bio-Molecular computational abilities of DNA. In this paper authors compare the various DNA cryptographic algorithms on certain key and important parameters. These parameters would also help the future researchers to design or improve the DNA storage techniques for secure data storage in more efficient and reliable manner. The authors also explain the different biological and arithmetic operators use in the DNA cryptographic algorithms. © 2014 IEEE.

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