Ultra Wideband Antennas

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 Classification of the Methods Finite Differences Method Finite Element Method (FEM) Method of Moments (MoM) Software Available NEC HFSS CST STUDIO SUITE Bibliography Nabla: The Differential Operator Rectangular Coordinates Cylindrical Coordinates Spherical Coordinates Some Concepts Related to Differential Equations Generalities Order Differential Equation Systems Initial and Boundary Value Conditions Existence and Uniqueness Poisson and Laplace Equations Poisson's Equation Laplace's Equation Index

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