Balamati Choudhury's Books

Refined Ray Tracing inside Single- and Double-Curvatured Concave Surfaces

By: Balamati Choudhury,Rakesh Mohan Jha

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Refined Ray Tracing inside Single- and Double-Curvatured Concave Surfaces

By: Balamati Choudhury,Rakesh Mohan Jha

This book describes the ray tracing effects inside different quadric surfaces. Analytical surface modeling is a priori requirement for electromagnetic (EM) analysis over aerospace platforms. Although numerically-specified surfaces and even non-uniform rational basis spline (NURBS) can be used for modeling such surfaces, for most practical EM applications, it is sufficient to model them as quadric surface patches and the hybrids thereof. It is therefore apparent that a vast majority of aerospace bodies can be conveniently modeled as combinations of simpler quadric surfaces, i.e. hybrid of quadric cylinders and quadric surfaces of revolutions. Hence the analysis of geometric ray tracing inside is prerequisite to analyzing the RF build-up. This book, describes the ray tracing effects inside different quadric surfaces such as right circular cylinder, general paraboloid of revolution (GPOR), GPOR frustum of different shaping parameters and the corresponding visualization of the ray-path details. Finally ray tracing inside a typical space module, which is a hybrid of a finite segment of right circular cylinder and a frustum of GPOR is analyzed for practical aerospace applications.

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ISBN 10

9812878084

ISBN 13

9789812878083

Permittivity and Permeability Tensors for Cloaking Applications

By: Balamati Choudhury,Pavani Vijay Reddy,Rakesh Mohan Jha

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Permittivity and Permeability Tensors for Cloaking Applications

By: Balamati Choudhury,Pavani Vijay Reddy,Rakesh Mohan Jha

This book is focused on derivations of analytical expressions for stealth and cloaking applications. An optimal version of electromagnetic (EM) stealth is the design of invisibility cloak of arbitrary shapes in which the EM waves can be controlled within the cloaking shell by introducing a prescribed spatial variation in the constitutive parameters. The promising challenge in design of invisibility cloaks lies in the determination of permittivity and permeability tensors for all the layers. This book provides the detailed derivation of analytical expressions of the permittivity and permeability tensors for various quadric surfaces within the eleven Eisenhart co-ordinate systems. These include the cylinders and the surfaces of revolutions. The analytical modeling and spatial metric for each of these surfaces are provided along with their tensors. This mathematical formulation will help the EM designers to analyze and design of various quadratics and their hybrids, which can eventually lead to design of cloaking shells of arbitrary shapes.

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ISBN 10

981287805X

ISBN 13

9789812878052

PBG based Terahertz Antenna for Aerospace Applications

By: Balamati Choudhury,Bhavani Danana,Rakesh Mohan Jha

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PBG based Terahertz Antenna for Aerospace Applications

By: Balamati Choudhury,Bhavani Danana,Rakesh Mohan Jha

This book focuses on high-gain antennas in the terahertz spectrum and their optimization. The terahertz spectrum is an unallocated EM spectrum, which is being explored for a number of applications, especially to meet increasing demands of high data rates for wireless space communications. Space communication systems using the terahertz spectrum can resolve the problems of limited bandwidth of present wireless communications without radio-frequency interference. This book describes design of such high-gain antennas and their performance enhancement using photonic band gap (PBG) substrates. Further, optimization of antenna models using evolutionary algorithm based computational engine has been included. The optimized high-performance compact antenna may be used for various wireless applications, such as inter-orbital communications and on-vehicle satellite communications.

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ISBN 10

9812878025

ISBN 13

9789812878021

Active Terahertz Metamaterial for Biomedical Applications

By: Balamati Choudhury,Arya Menon,Rakesh Mohan Jha

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Active Terahertz Metamaterial for Biomedical Applications

By: Balamati Choudhury,Arya Menon,Rakesh Mohan Jha

This book describes a metamaterial-based active absorber for potential biomedical engineering applications. Terahertz (THz) spectroscopy is an important tool for imaging in the field of biomedical engineering, due to the non-invasive, non-ionizing nature of terahertz radiation coupled with its propagation characteristics in water, which allows the operator to obtain high-contrast images of skin cancers, burns, etc. without detrimental effects. In order to tap this huge potential, it is important to build highly efficient biomedical imaging systems by introducing terahertz absorbers into biomedical detectors. The biggest challenge faced in the fulfilment of this objective is the lack of naturally occurring dielectrics, which is overcome with the use of artificially engineered resonant materials, viz. metamaterials. This book describes such a metamaterial-based active absorber. The design has been optimized using particle swarm optimization (PSO), eventually resulting in an ultra-thin active terahertz absorber. The absorber shows near unity absorption for a tuning range of terahertz (THz) application.

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ISBN 10

9812877932

ISBN 13

9789812877932

Terahertz Antenna Technology for Space Applications

By: Balamati Choudhury,Aniruddha R. Sonde,Rakesh Mohan Jha

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Terahertz Antenna Technology for Space Applications

By: Balamati Choudhury,Aniruddha R. Sonde,Rakesh Mohan Jha

This book explores the terahertz antenna technology towards implementation of compact, consistent and cheap terahertz sources, as well as the high sensitivity terahertz detectors. The terahertz EM band provides a transition between the electronic and the photonic regions thus adopting important characteristics from these regimes. These characteristics, along with the progress in semiconductor technology, have enabled researchers to exploit hitherto unexplored domains including satellite communication, bio-medical imaging, and security systems. The advances in new materials and nanostructures such as graphene will be helpful in miniaturization of antenna technology while simultaneously maintaining the desired output levels. Terahertz antenna characterization of bandwidth, impedance, polarization, etc. has not yet been methodically structured and it continues to be a major research challenge. This book addresses these issues besides including the advances of terahertz technology in space applications worldwide, along with possibilities of using this technology in deep space networks.

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ISBN 10

9812877991

ISBN 13

9789812877994

Active Terahertz Metamaterial for Biomedical Applications

By: Balamati Choudhury,Arya Menon,Rakesh Mohan Jha

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Active Terahertz Metamaterial for Biomedical Applications

By: Balamati Choudhury,Arya Menon,Rakesh Mohan Jha

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9812877932

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9789812877932

Book's by Balamati Choudhury

Refined Ray Tracing inside Single- and Double-Curvatured Concave Surfaces

Refined Ray Tracing inside Single- and Double-Curvatured Concave Surfaces

Permittivity and Permeability Tensors for Cloaking Applications

Permittivity and Permeability Tensors for Cloaking Applications

PBG based Terahertz Antenna for Aerospace Applications

PBG based Terahertz Antenna for Aerospace Applications

Active Terahertz Metamaterial for Biomedical Applications

Active Terahertz Metamaterial for Biomedical Applications

Terahertz Antenna Technology for Space Applications

Terahertz Antenna Technology for Space Applications

Active Terahertz Metamaterial for Biomedical Applications

Active Terahertz Metamaterial for Biomedical Applications

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