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Investigations on some compact wideband fractal antennas

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TLDR
In this article, a wideband fractal monopole antenna is proposed to achieve the acceptable performance in terms of isolation, envelope correlation coefficient, capacity loss, radiation patterns and efficiency.
Abstract
Today’s small handheld and other portable devices challenge antenna designers for ultrathin, and high performances that have the ability to meet multi standards. In the context, fractal geometries have significant role for antenna applications with varying degree of success in improving antenna characteristics. In this thesis, we have investigated several wideband fractal monopole antennas. This work starts with design and implementation of Koch fractal, hybrid fractal, sectoral fractal, semi-circle fractal monopole antennas with discussion, covering their operations, electrical behavior and performances. The performances of these designs have been studied using standard simulation tools used in industry/academia and are experimentally verified. Frequency reconfigurable Koch snowflake fractal monopole antenna is also introduced. The present antenna can be used as an array element and has a wideband frequency of operation. A square Sierpinski monopole antenna has been designed, which is suitable for use in indoor UWB radio system and outdoor base station communication systems. Technique for obtaining a band stop function in the 5-6 GHz frequency band is numerically and experimentally presented. In addition to examining the performance of UWB system, the transfer function and waveform distortion are discussed. Finally, fractal antenna for array with MIMO environment is developed for mobile communication devices. Aim of this work is to achieve the acceptable performances in terms of isolation, envelope correlation coefficient, capacity loss, radiation patterns and efficiency. Furthermore, a wideband feed network prototype based on a modified Wilkinson power divider is designed. The designed feed network has been used in constructing 2-element and 4-element linear antenna arrays for high gain. This research work has addressed the effectiveness of fractal geometries in antenna and to bring-out the true advantages of their in antenna engineering.

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Book

Analysis, design, and measurement of small and low-profile antennas

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TL;DR: How to apply the moment method to wire antenna analysis evaluation of the basic performance of microstrip antennas and some considerations of small antenna measurements.

Maximum likelihood receiver for multiple channel transmission systems

W. van Etten
TL;DR: In this article, a maximum likelihood estimator for digital sequences disturbed by Gaussian noise, intersymbol interference (ISI) and interchannel interference (ICI) is derived.
Proceedings ArticleDOI

Design of Star-Shaped Fractal Antenna for Wideband Applications

TL;DR: In this paper, a star-shaped modified fractal antenna with a wide operating bandwidth was proposed for S-band applications with an overall dimension of 70 40 1.6 mm3.
Dissertation

Design and Analysis of Fractal antennas

TL;DR: In this article, the authors have proposed three antennas with different functionalities: a hybrid fractal employing Sierpinski Carpet and Giuseppe Peanu, superimposed with each other to give narrowband functionality to the antenna.
References
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Book

The Fractal Geometry of Nature

TL;DR: This book is a blend of erudition, popularization, and exposition, and the illustrations include many superb examples of computer graphics that are works of art in their own right.
Book

Wireless Communications: Principles and Practice

TL;DR: WireWireless Communications: Principles and Practice, Second Edition is the definitive modern text for wireless communications technology and system design as discussed by the authors, which covers the fundamental issues impacting all wireless networks and reviews virtually every important new wireless standard and technological development, offering especially comprehensive coverage of the 3G systems and wireless local area networks (WLANs).
Journal ArticleDOI

On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas

TL;DR: In this article, the authors examined the performance of using multi-element array (MEA) technology to improve the bit-rate of digital wireless communications and showed that with high probability extraordinary capacity is available.
Book

A Treatise on Electricity and Magnetism

TL;DR: The most influential nineteenth-century scientist for twentieth-century physics, James Clerk Maxwell (1831-1879) demonstrated that electricity, magnetism and light are all manifestations of the same phenomenon: the electromagnetic field as discussed by the authors.