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Sarkar P.,North - Eastern Hill University | Rakshit I.,National Institute of Technology Durgapur | Adhikari S.,National Institute of Technology Durgapur | Pal M.,NSHM Knowledge Campus Durgapur | Ghatak R.,National Institute of Technology Durgapur
International Journal of Microwave and Wireless Technologies | Year: 2014

This paper presents a band-notched ultra-wideband bandpass filter by loading a short stub and an asymmetric step impedance stub in a uniform impedance resonator. The passband extends from 3.04 to 10.8 GHz frequency. The multimode resonator provides a sharp band edge with measured transmission zeros at 2.59 and 13 GHz. The later one is due to source load coupling. The passband insertion loss is within 1.5 dB. The embedded spiral resonator introduces a notch at 5.25 GHz with attenuation of 15 dB. The filter exhibits a wide stop band till 15 GHz. The in band and out of band performance obtained from full-wave electromagnetic simulation and measurement are in close agreement. © Cambridge University Press and the European Microwave Association 2013. Source


Mandal B.K.,NSHM Knowledge Campus Durgapur | Bhattacharyya D.,Vignan University | Shin K.-H.,Kookmin University
Contemporary Engineering Sciences | Year: 2014

The Wireless Sensors Network (WSN) is an emergent technology resulting from progress of various fields. Many applications of networks WSN are developed. In the last years, wireless sensor networks (WSNs) have gained increasing attention from both the research community and actual users. As sensor nodes are generally battery-powered devices, the critical aspects to face concern how to reduce the energy consumption of nodes, so that the network lifetime can be extended to reasonable times. As sensor networks are deployed in adversarial environments and used for critical applications. In this paper, we consider routing security in wireless sensor networks. Many sensor network routing protocols have been proposed, but very less of them have been designedwith security as a goal. We propose security goals for routing in sensor networks. We describe crippling attacks against all of them and suggest countermeasures and design considerations. © 2014 Bijoy Kumar Mandal, Debnath Bhattacharyya and Kil-hwan Shin. Source

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