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The potential of high permittivity dielectric materials for local capacitive loading of microstrip components has been demonstrated in the 9th Chapter.

In the 8th chapter summarizes the current status of the MOSFET´s for very high frequency applications. The 7th chapter present several key points in materials optimization, capacitor structure, and device designs that Georgia Institute of Technology and nGimat have focused on in the last few years.

Were covered and also the traditional tuning using mechanically adjustable screws was discussed. And the 6th chapter covered filters made using different technologies including active devices, MEMS, ferroelectric and ferromagnetic materials.

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The basic theory of microwave filters, to describe how to design practical microwave filters, and to investigate ways of implementing high performance filters for modern communication systems are given in the 5th chapter. They propose a novel NPLH (Near Pure Left Handed) transmission line concept to reduce RH (Right Handed) characteristics and realize compact small antenna designs using meta-material concepts and the possibility of realising negative permittivity using EM shielding of concrete block is considered.

In the 4th chapter the authors analyze meta-material concepts using transmission line theory proposed by Caloz and Itho and propose effective materials for realising these concepts. Since then, these electrical structures have been studied extensively and are referred to as meta-material structures. Under these conditions, phase velocity propagates in opposite direction to group velocity. Suppositional material is characterised by negative permittivity and negative permeability material properties. Wave propagation in suppositional material was first analyzed by Victor Vesalago in 1968. The 3rd chapter represented the increasing importance of the material’s anisotropy in the modern design and the possibilities for accurate determination of this characteristic by waveguide and resonance methods. There are two main reasons to want to have information for the actual anisotropy of a substrate – to control the technology (necessary for the manufacturers) and to conduct more realistic simulations of the structures, containing anisotropic materials (necessary for the users). The next two chapters explains the physics underlying the design of purely dielectric NI metamaterials and will discuss some ways in which these materials may be used to enhance various microwave technologies.

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Examples include enhanced transmission line capability, power enhancement/size reduction in antenna applications and, in the field of nondestructive testing, improved sensitivity of patch sensors and detection of sub-wavelength defects in dielectrics by utilizing a NI superlens. Materials that exhibit negative index (NI) of refraction have several potential applications in microwave technology. From the results HR SOI seems to be a good candidate in the coming year to address both low cost and low power mass market CMOS digital and RF/ MMW applications. The first chapter is aimed at describing the evolution of technological processes for the design of passive functions in millimetre-wave frequency range. Preface This book deal with the modern developing of microwave and millimeter wave technologies. © 2010 In-teh Additional copies can be obtained from: First published March 2010 Printed in India Technical Editor: Sonja Mujacic Cover designed by Dino Smrekar Microwave and Millimeter Wave Technologies: from Photonic Bandgap Devices to Antenna and Applications, Edited by Prof. After this work has been published by the In-Teh, authors have the right to republish it, in whole or part, in any publication of which they are an author or editor, and the make other personal use of the work. Publisher assumes no responsibility liability for any damage or injury to persons or property arising out of the use of any materials, instructions, methods or ideas contained inside. No responsibility is accepted for the accuracy of information contained in the published articles.

Statements and opinions expressed in the chapters are these of the individual contributors and not necessarily those of the editors or publisher. Published by In-Teh In-Teh Olajnica 19/2, 32000 Vukovar, Croatia Abstracting and non-profit use of the material is permitted with credit to the source. Microwave and Millimeter Wave Technologies: from Photonic Bandgap Devices to Antenna and Applications

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