A Review on Bandwidth Improvement Techniques of A Waveguide Arrays

Abstract
A review on the bandwidth improvement techniques for a waveguide being operated in S band is presented in this paper. Numerous methods have been
talked about in this paper to improve the transmission capacity of a waveguide.arrays Utilization of thinner walls in wave guides, decreased cross
sectional waveguide, wide slots as well as adjusted slots represent the realized procedures to improve the data transfer capacity, also discussed each of
the technique individually with their advantages and disadvantages in detail further we have also discussed about novel differential feeding technique
named hybrid phase feeding is deployed to achieve the broadband nature of the waveguide array.

A SURVEY OF ANTENNA ARRAY OPTIMIZATION USING META-HEURISTIC ALGORITHM

Abstract: Antennas are termed as eyes of the world. They are used in wireless systems. There are various factors that influence the antenna design. In order to overcome the design problems, recently many algorithms have been developed to optimize the antenna with respect to general constraints, different criteria and performance characteristics. In the present era, nature inspired Meta-heuristic algorithms plays a vital role in optimizing the design issues related to an antenna. The Meta-heuristic algorithms include Genetic algorithm (GA), Ant Colony Optimization (ACO), backtracking search optimization algorithm (BSA), cuckoo search–chicken swarm optimization (CSCSO) and flower pollination algorithm (FPA). In this paper, the antenna array optimization is discussed which includes population-based meta-heuristic algorithms. This paper reviews antenna array design optimization for different antennas configurations. Index Terms - Optimization, Meta-heuristic algorithm.

Element Failure Correction Techniques of Linear Array Antenna- A Short Review

The influence of evolutionary algorithms enhanced its scope of getting its existence in almost every complex optimization problems. In this paper, cuckoo search algorithm, an algorithm based on the brood parasite behavior along with Levy weights has been proposed for the radiation pattern correction of a linear array of isotropic antennas with uniform spacing when failed with more than one antenna element. Even though deterioration produced by the failure of antenna elements results in various undesirable effects, consideration in this paper is given to the correction of side lobe level and null placement at two places. Various articles in the past have already shown that the idea to correct the radiation pattern is to alter the amplitude weights of the remaining unfailed elements, instead of replacing the faulty elements. This approach is made use of modifying the current excitations of unfailed elements using cuckoo search algorithm such that the resulting radiation pattern is similar to the unfailed original pattern in terms of side lobe level and null placement at two places.

Smart Transportation Using Missiles

Abstract:  The potential of any Nation today is being measured in terms of Advanced Equipment in its possession particularly in defence sector. Every year the budgetary allocations are being increased enormously. Protection of any country is undoubtedly an important task. But do the equipment will be applied?. when and where?. These questions you dont find any answers. The manufacturing, induction and protection of missiles plays major role in strategic planning of Defence services. They are not only expensive but also a burden to any country in the world. Defence Technologies in service of human being is not given much attention. In this paper,we have thrown a light in to how smart transportation can be done utilising missile technology for the applicaqtions of Health sector, Automobiles, Emergency services etc. We presented a proposed idea consisting of graphical views which may create a revolution if studied in deep and applied for real time applications Keywords: Missile Technology, Health sector, Automobiles, Defence sector, Emergency services.

Low SLL Narrow beam Planar Array: Design & Analysis.

Unconstrained and Constrained Null Pattern Recovery Using Evolutionary Computing Tools

Abstract

Over a decade, the evolutionary and social inspired computing techniques have revolutionarised the nonlinear problem-solving methods with their efficiency in searching for the global optimum solutions. Several engineering problems are dealt with such nature-inspired techniques. In the recent past, the evolutionary computing and socio-inspired algorithms have been applied to antenna array synthesis problems. In this chapter, the novel social group optimization algorithm (SGOA) is used for the antenna array synthesis. Three different and potential pattern synthesis problems like sidelobe level (SLL) optimization, null positioning, and failure compensation are dealt for demonstrating the effectiveness of the SGOA over the conventional uniform patterns. In all the cases, the simulation-based experimentation is repeated for 20-element and 28-element linear array. The robustness of the algorithm to deal with the constrained objectives of antenna array synthesis is discussed with relevant outcomes from the simulations in terms of the convergence plots.

Classification and Filtered Framework for DDOS Attacks in IoT of Wireless Networks

A distributed denial of service (DDoS) attack is an attempt to partially or completely shut down the targeted server with a flood of internet traffic. The primary aim of this attack is to disrupt regular traffic flow to the victim’s server or network. DDoS attacks are volumetric attacks, and non-legacy IoT devices with low security such as webcams, baby monitoring devices and printers are compromised to form a botnet. High traffic from compromised IoT devices is rerouted to servers to disrupt their regular services. DDoS attacks are to an extent covered in the research literature. However, existing research do not discuss all DDoS attacks on general servers and botnet attacks on IoT devices and suggest few detection and mitigation solutions which are limited to addressing attacks on the cloud environment. Existing survey focuses either on the cloud layer or the IoT layer. A complete survey of DDoS attacks for both IoT and the cloud environment is not present in the current literature. Our survey is a comprehensive approach which includes general DDoS attack motivations and specific reasons why attackers prefer IoT devices to launch DDoS attacks. Various attack methods to compromise IoT devices and tools used to deploy botnet-infected IoT devices for DDoS attacks on the cloud layer are presented. A detailed attack classification on IoT devices and the cloud environment is presented considering that IoT devices are first compromised and then used by attackers against their primary targets on the cloud layer. Various state-of-the-art defense measures in the current literature for defense against DDoS attacks are present. Suggestions to implement an essential first line of defense for IoT devices are suggested. Our paper, to the best of our knowledge, is first to provide a holistic study of DDoS attacks from IoT devices to the cloud environment.

AUTOMATIC SPEECH RECOGNITION SYSTEM USING MFCC-BASED LPC APPROACH WITH BACK PROPAGATED ARTIFICIAL NEURAL NETWORKS

Abstract : Over the previous years, a marvelous quantity of study was performed by utilizing the artificial intelligence based deep learning approaches for the speech recognition applications. The automatic speech recognition (ASR) facing the problems in as preprocessing, feature extraction and classification stages mostly, thus solving these problems is mandatory to improve the classification accuracy of speech processing. To solve these issues, an advanced speech recognition methodology has developed by utilizing the Spectral Subtraction (SS) method of denoising with the combination of Mel-frequency Cepstral coefficients (MFCCs) and linear predictive coefficients (LPCs) feature extraction of speech signals. Then back propagated artificial neural networks (BP-ANN) is utilized for classifying the speech signals for the purpose of ASR, respectively. The simulation results show that the proposed approach gives the better classification accuracy compared to the state-of-ASR approaches..

Design and Development of Speech Recognition: A Review

Implementation Of Corner Sliced Circularly Polarized Square Patch Antenna

Abstract

This paper presents an improved state of corner cut with U Shaped slot feed strategy. The
proposed reception apparatus is structured and created utilizing FR4 glass epoxy with thickness h=8 mm and
Ꜫr=4.6. The designed antenna retained its highest gain of 4.862 dBi where as in practical scenario it retained
around 3.658 dBi between the resonating frequency from 1.9 GHz to 2.6 GHz. This antenna shows right
hand round about polarization with Axial ratio of 1.6 dB at 2.5 GHz. The deliberate model antenna gives
circularly polarization in general radiation productivity of over 80%..

INFLUENCE OF ADMITTANCE PARAMETERS ON COUPLING AND VSWR IN WAVEGUIDE JUNCTIONS

Abstract: Metallic waveguides are popular as transmission lines as well as electromagnetic radiators. In order to control radiating power and polarization as required by users, waveguide slot coupled junctions are in wide use. The coupling from the primary guide to radiating guide through rectangular slot coupler plays a major role on the radiating characteristics. It is evident from the literature a comprehensive effect of admittance parameters of the device under consideration is not available. Considering the above realities intensified examinations are completed to discover the impact of admittance on coupling. In the current work, presented the effectively obtained outcomes. The change in VSWR and Coupling as a function of frequency are presented over S-Band frequency range for co-planner E-H plane T-Junction. Keywords: electromagnetic radiators, waveguide slot coupled junctions, VSWR, co-planner E-H plane T-Junction

Sidelobe reduction in an Antenna Array using natured inspired Genetic Algorithm

Abstract: In the era of wireless communication, it is a crucial role to satisfy the stake holders. It is very important to improve the capability in defence systems and communications. Each block in basic block diagram of wireless communication has its importance. In wireless communication, Antenna play a vital role. In most of the scenarios, single antenna element is not able to serve the purpose. So, there must be some solution to it. It is “Antenna Arrays”. In this study, the antenna array is synthesized with the help of optimization algorithm namely Genetic algorithm. The sidelobe levels are reduced to eradicate the interference caused by the eve’s (ear droppers). The results show that the optimization algorithm is perform well in terms of SLL. Keywords: Antenna Array, Genetic Algorithm, sidelobe level

A Survey On Synthesis Of Linear Antenna Arrays, Circular Antenna Arrays, Conformal Arrays And Beamforming Techniques

Abstract— By 2022, the world will witness new technologies in the field of communications, Radar communications and wireless communications. Therefore, there is lot of future scope for the antenna design to meet the client needs. Lot of factors will influence the synthesis of an antenna. In the present era, synthesis of antenna arrays and beamforming is an issue in the area of Radar systems and wireless systems. Meta-heuristic optimization algorithms play a major role in synthesis of an antenna arrays. Meta-heuristic optimization algorithms comprise Bat algorithm, Chicken swarm, Cuckoo search (CS), Ant colony, Runner root and flower pollination algorithms. This paper explains about the synthesis of linear antenna arrays (LAA), circular antenna arrays (CAA), planar arrays, conformal arrays and Hybrid Beamforming techniques. Keywords--- Meta-heuristic optimization, Beamforming, Linear antenna array, Circular antenna array

Abstract— By 2022, the world will witness new technologies in the field of communications, Radar communications and wireless communications. Therefore, there is lot of future scope for the antenna design to meet the client needs. Lot of factors will influence the synthesis of an antenna. In the present era, synthesis of antenna arrays and beamforming is an issue in the area of Radar systems and wireless systems. Meta-heuristic optimization algorithms play a major role in synthesis of an antenna arrays. Meta-heuristic optimization algorithms comprise Bat algorithm, Chicken swarm, Cuckoo search (CS), Ant colony, Runner root and flower pollination algorithms. This paper explains about the synthesis of linear antenna arrays (LAA), circular antenna arrays (CAA), planar arrays, conformal arrays and Hybrid Beamforming techniques. Keywords--- Meta-heuristic optimization, Beamforming, Linear antenna array, Circular antenna array