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Bandstop filters are realized by etching periodic patterns of complementary split ring resonators(CSRR) on the ground plane, exactly below the central microstrip transmission line. This article presents hexagonal CSRR in the design of a band bandstop filter with stopbands at 1.45GHz. First, a regular hexagonal shaped CSRR is used to realize a bandstop filter. This hexagonal shaped SRR is modified...
A low complexity frequency domain bearing estimation technique is described in this paper. The technique presented makes use of a pair of orthogonal dipoles or differential sensors along with an omni directional pressure sensor for the bearing estimation. The paper describes the theory from first principles with an overview of the simulation results and also covers the proof of concept experimental...
A MANET consist of a collection of wireless mobile nodes in which packets are transmitted from one to another node via intermediate nodes within range. To find an efficient routing protocol, which is used to transmit data from source to destination across whole network, is a major issue in networking research. MANETs are flexibly distributed that can change their locations and are self-configurable...
In a radar system, frequency up and down conversion processes requires higher frequency local oscillators (LO). Advancement in microwave photonics and optical domain made it possible to synthesis high frequency microwave signals. There are variety of microwave generation techniques available in optical domain such as optical heterodyning, optical injection locking, optical phase lock loop, Mach-Zehnder...
Color is an evitable feature of image and its prediction is still a critical issue in computer vision and image processing. It is necessary to ensure that the perceived color of an object remains constant under varying conditions. Novelty of this paper lies in introduction of a linguistic color space using mamdani's fuzzy inference system for better color constancy and image enhancement. We define...
Image fusion is the process of merging two or more images into a more informative single image. Satellite image fusion uses high resolution panchromatic image and low resolution multispectral image. IHS, Brovery, PCA, Wavelet, Curvelet etc are the existing techniques available for image fusion. But simultaneous retention of spatial and spectral resolution is an important concern in remote sensing...
MRI scanner is the most important diagnostic tool that aids in the diagnosis of diseases and offers most sensitive and non-invasive way of Imaging. The sophisticated tool helps clinician to understand the cause of patient's particular health issue. RF Surface coils are used in MRI for better signal reception as they are more sensitive to signal close to the coil, thus detecting signals from organ...
A novel coupling enhancement technique of waveguide fed hemispherical dielectric resonator antenna (DRA) is presented in this paper. A capacitive waveguide junction using two steps is placed between the rectangular waveguide and the slotted ground plane, DRA is placed above the ground plane. Single, dual and wide band operation of the proposed technique is illustrated. Very good coupling is obtained...
Visual Cryptography is an approach to share secrets, basically images, which are divided into n shares using the basic principles of Shamir Secret Sharing Schemes. In (t, n) system, the secrets can be retrieved by combining t number of threshold shares from n shares. In the existing system, the attacks by malicious outsider and malicious participant cannot be detected. In this paper, a double security...
MANET (Mobile Ad Hoc Network) consists of mobile nodes having no fixed infrastructure. These networks have dynamic topology and all the nodes are in general autonomous. Normally network comprises of selfish individuals that are not willing to forward the packets but wants to forward their own messages. In ad hoc network throughput increases when all available nodes are used for routing and forwarding...
Wireless sensor networks (WSNs) are gaining more and more interest in the research community due to their unique characteristics and have a lots of interesting applications. Besides energy consumption security of WSN is being a critical issue nowadays. This is because WSNs are easily effected by various types of attacks and node compromises so they require security mechanisms to defend against them...
Node localization is one of the main challenges in Wireless Sensor Networks (WSNs). In all sensor network applications, it is important to know the origin of collected data and reported events. This paper proposes a bio-inspired method for solving the WSN localization problem which is formulated as a non linear optimization problem. An Artificial immune inspired, population based optimization algorithm...
Modified rectangular shape ultra wide band microstrip antenna with microstrip line feed is proposed. The effects of tapering structure on the realized bandwidth are discussed. The tapered end configuration yields bandwidth of 15.4 GHz with a peak gain of 2 dBi. Further, the effect of replacing the tapered end structure with an elliptical base structure is investigated. The elliptical base antenna...
Broadband 90° isosceles triangular microstrip antenna derived from equivalent equilateral triangular microstrip antenna, is proposed. The parametric study for variation in isosceles angle from 50° to 90° is presented. The increasing angle tunes the spacing between TM10 and TM11 modes of the triangular patch to realize broadband response. The simulated and measured bandwidth of more than 600 MHz (>...
The reliability of wave prediction is a crucial issue in coastal, harbor and ocean engineering. Support vector machine (SVM) is an appropriate and suitable method for significant wave height (Hs) prediction due to its best versatility, robustness, and effectiveness. In this present work, only significant wave height (Hs) of previous time steps were used as predictors during the period 01-01-2004 to...
A Self-Learning Hybrid Fuzzy-PID Controller is developed for pressure control in a first order hydraulic tank system. The system is closed loop wherein a hybrid Fuzzy-PID controller prescribes the duty cycle of a PWM generator which controls an ON-OFF valve connected to a hydraulic tank. The hydraulic tank is modeled as a first order system. Appropriate fuzzy rules and membership functions are developed...
In the present communication, we have applied the concept of Triangular Intuitionistic Fuzzy Numbers (TIFNs) to the study of a Multiple Criteria Decision Making (MCDM) problem for finding the best alternative where the linguistic variables for the criteria are intuitively predefined in the form of TIFNs. On the basis of decision maker's qualitative opinions as well as the management's opinions to...
Heterogeneous Network consists of wired and wireless network. In these networks, congestion control and quality of service is major issue. Due to this issues, delay and jitter are increased which decreases the performance of network. For reducing this issues there are various queue management techniques which are classified as Active Queue Management and Passive Queue Management. AQM consists of access...
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