Librería Portfolio

Features
Offers a comprehensive overview of the latest ultra wideband (UWB) antenna research and development
Presents the current state of the art of UWB antennas, from theory specific for these radiators to guidelines for the design of omnidirectional and directional UWB antennas
Provides a valuable reference for the scientific community, as UWB antennas have applications in body area networks, radar, imaging, spectrum monitoring, electronic warfare, wireless sensor networks, and more
Summary
Ultra Wideband Antennas: Design, Methodologies, and Performance presents the current state of the art of ultra wideband (UWB) antennas, from theory specific for these radiators to guidelines for the design of omnidirectional and directional UWB antennas. Offering a comprehensive overview of the latest UWB antenna research and development, this book:

Discusses the developed theory for UWB antennas in frequency and time domains
Delivers a brief exposition of numerical methods for electromagnetics oriented to antennas
Describes solid-planar equivalence, which allows flat structures to be implemented instead of volumetric antennas
Examines the impedance matching, phase linearity, and radiation patterns as design objectives for omnidirectional and directional antennas
Addresses the time domain signal analysis for UWB antennas, from which the distortion phenomenon can be modeled
Includes illustrative examples, design equations, CST MICROWAVE STUDIO® simulations, and MATLAB® plot generations
Compares the performance of different UWB antennas, supplying useful insight into particular tendencies and unresolved problems
Ultra Wideband Antennas: Design, Methodologies, and Performance provides a valuable reference for the scientific community, as UWB antennas have a variety of applications in body area networks, radar, imaging, spectrum monitoring, electronic warfare, wireless sensor networks, and more.



Table of Contents
Introduction

Importance of Antennas in Modern Life

Ultra Wideband Systems

UWB Antennas

Scope of the Book

Bibliography

General Concepts of Antennas

Introduction

Classical Narrowband Antennas

Wire Antennas

Aperture Antennas

Reflectors

Microstrip Antennas

Antenna Arrays

Feed-Point

Gain and Directivity

Radiation Pattern Concept

Polarization

Impedance

Reflection Coefficient

Quality Factor

Bandwidth

Bibliography

Recent Developments in Ultra Wideband Antennas

Introduction

Background to Ultra Wideband Antennas

Planarized UWB Antennas

Vivaldi Antenna

Planarized Antenna with Rectangular Radiator

CPW-Fed Planar Ultra Wideband Antenna Having a Frequency Band Notch Function

Slot Antenna Based on Precooked Ceramic

Volcano-Smoke Slot Antenna

Printed Circular Disc Monopole Antenna

Microstrip Slot Antenna with Fractal Tuning Stub

Planar Miniature Tapered-Slot-Fed Annular Slot Antenna

Tulip-Shaped Monopole Antenna

Balloon-Shaped Monopole Antenna

Half Cut Disc UWB Antenna

Planar UWB Antenna Array

Octagonal Shaped Fractal UWB Antenna

UWB Planar Monopoles Antennas

Planar Inverted Cone Antenna (PICA)

Bi-Arm Rolled Monopole Antenna

Square Planar Monopole Antenna with Notching Technique

Planar Directional Monopole Antenna with Leaf Form

Compact UWB Antenna

Double Ridged Guide Horn Antenna

Comparison of UWB Antennas

Conclusions

Bibliography

Developments in Ultra Wideband Antenna Theory

Introduction

UWB Bandwidth

Preliminary Concepts

Biconical Antenna

Planar Monopole Structure as a Basic Element of UWB Antenna Theory

Theory of Planar Monopole Antenna from a Microstrip Antenna

Microstrip Antenna

Planar Monopole Antenna

Planar Monopole Antenna from a Cylindrical Monopole Antenna

Resonance Frequency

Lower Cut-Off Frequency for Different Planar Antenna Shapes

Some Factors that Influence UWB Antenna Performance

Influence of the Radiator

Ground Plane

Bibliography

Phase Linearity

Time Domain and Frequency Domain

The Fourier Transform

Short Time Duration, Wide Spectrum

Impulse Response and Transfer Function

Characteristics of the Impulse Response of a UWB Antenna

Pulse Distortion

Phase Linearity

Frequency Response

Measures of the Change of Phase: Phase Center and Group Delay

Phase Response and Pulse Distortion

Non-Linear and Quasi-Linear Phase Antennas

Frequency Independent Antennas

Other Antennas

Bibliography

Design of Omnidirectional UWB Antennas for Communications

Introduction to Omnidirectional UWB Antennas

Starting Point: Monopole Square Planar Antenna

Design Methodology for Planar Structures

Simulation Results Based on the Design Methodology for Planar Structures

Variation of Beveling Angle

Variation of the Radiator Width

Variation of the Feeder Width

Variation of the Height between the Ground Plane and the Radiator

Reduction of Variations in the Radiation Pattern

Design of Planarized UWB Antennas

General Concepts

Preliminary Square Radiator

Tuning of a Planarized Rectangular Antenna for UWB

Simulation Results

Measurement Results

Scaling Method to Achieve other Bandwidths

Bibliography

Design of Directional Planar and Volumetric UWB Antennas

Introduction to Directional UWB Antennas

Vivaldi Antenna

Leaf Shape Antenna

TEM Horn Antenna

Quasi-Yagi Antenna

Design of a Directive Rectangular Planar Monopole

Design Methodology for a UWB Directive Rectangular PMA

Example of Design of the UWB Directive Rectangular PMA

Mechanical Refinement of the Antenna Structure

Use of a Reflector to Increase the Antenna Directivity

Modification of the Ground Plane to Improve the Antenna Directivity

Design of Planar Directional UWB Antenna for Any Desired Operational Bandwidth

Basic Structure

Transformation Process into Directional Radiation Pattern

Application of the Solid-Planar Correspondence Principle

Design Equation

Experimental Results

Comparison of Different Directive UWB Antennas

Bibliography

Current Tendencies and Some Unresolved Problems

UWB Antennas Today

Impedance Matching, Phase Linearity and Radiation Pattern

Directional UWB Antennas

UWB Antenna Arrays

Interference

Body Area Networks

Radar: Medical Imaging and Others

USB Dongle and Access Point

Computational Aspects

Wider and Wider Bandwidths

Bibliography

Numerical Methods for Electromagnetics

Maxwell's Equations

Basic Field Laws

Scalar and Vector Potentials

Wave Equations

Essence of the Physically-Sized Antennas Problem

Boundary Value Conditions

Normal Components

Tangential Components

Boundary Conditions and Unique Solution to the Maxwell's Equations

Radiation Condition

Current Distribution on Antennas

Numerical Methods

Continuous Equations in a Finite Computational Environment

Computational Domain and Meshing