Generalized Transmission Line Method to Study the Far-zone Radiation of Antennas under a Multilayer Structure (Synthesis Lectures on Antennas)

This book gives a step-by-step presentation of a generalized transmission line method to study the far-zone radiation of antennas under a multilayer structure. Normally, a radiation problem requires a full wave analysis which may be time consuming. The beauty of the generalized transmission line method is that it transforms the radiation problem for a specific type of structure, say the multilayer structure excited by an antenna, into a circuit problem that can be efficiently analyzed. Using the Reciprocity Theorem and far-field approximation, the method computes the far-zone radiation due to a Hertzian dipole within a multilayer structure by solving an equivalent transmission line circuit. Since an antenna can be modeled as a set of Hertzian dipoles, the method could be used to predict the far-zone radiation of an antenna under a multilayer structure. The analytical expression for the far-zone field is derived for a structure with or without a polarizer. The procedure of obtaining the Hertzian dipole model that is required by the generalized transmission line method is also described. Several examples are given to demonstrate the capabilities, accuracy, and efficiency of this method. Table of Contents: Antennas Under a Multilayer Dielectric Slab / Antennas Under a Polarized Multilayer Structure / Hertzian Dipole Model for an Antenna / Bibliography / Biography Contents......Page 4 Introduction......Page 12 Radiation due to an electric dipole......Page 14 Evaluation of the horizontal component using chain matrix......Page 16 Evaluation of the vertical component......Page 18 Field projection......Page 19 Evaluation of the horizontal component using S chain matrix......Page 20 Radiation due to a magnetic dipole......Page 23 Evaluation of the vertical component......Page 24 Evaluation of the horizontal component using S chain matrix......Page 25 Results verification......Page 26 Applications......Page 32 DRA in a four-layer structure......Page 34 Conclusions......Page 38 Antennas Under a Polarized Multilayer Structure......Page 41 Radiation due to an electric dipole......Page 42 Radiation due to a magnetic dipole......Page 46 PEC-type asymptotic boundary conditions......Page 47 PMC-type asymptotic boundary conditions......Page 50 Cross polarization reduction......Page 51 Polarizer......Page 53 Discussion......Page 56 Conclusions......Page 57 Hertzian Dipole Model for an Antenna......Page 61 Introduction......Page 62 Particle swarm optimization method......Page 63 PSO model for getting a narrowband dipole model......Page 64 Limitations of the narrowband model......Page 65 PSO model for getting a wideband dipole model......Page 70 Modeling of a wideband antenna......Page 71 Application......Page 74 Rejection of Gaussian noise......Page 79 Frequency scalability......Page 82 Conclusions......Page 83 Derivation of Equation (2.24)......Page 84 Derivation of Equation (2.29)......Page 85 Derivation of Equation (2.30)......Page 86 Maxima Source Code......Page 87 Maxima source code for a PEC-SI......Page 88 Bibliography......Page 91 Biography......Page 94 Introduction Antennas under a multilayer dielectric slab Introduction Radiation due to an electric dipole Evaluation of the horizontal component using chainmatrix Evaluation of the vertical component Field projection Evaluation of the horizontal component using S chain matrix Radiation due to a magnetic dipole Evaluation of the horizontal component using chainmatrix Evaluation of the vertical component Field projection Evaluation of the horizontal component using S chain matrix Results verification Applications Thin wire monopole antenna in a two-layer structure DRA in a four-layer structure Conclusions Antennas under a polarized multilayer structure Introduction Radiation due to an electric dipole Radiation due to a magnetic dipole Asymptotic boundary conditions PEC-type asymptotic boundary conditions PMC-type asymptotic boundary conditions Applications Cross polarization reduction Polarizer Discussion Conclusions Hertzian dipole model for an antenna Introduction Narrowband Hertzian dipole model Particle swarm optimization method PSO model for getting a narrowband dipole model Limitations of the narrowband model Wideband Hertzian dipole model PSO model for getting a wideband dipole model Modeling of a wideband antenna Application Rejection of Gaussian noise Frequency scalability Conclusions A derivation of equations in chapter 2 Derivation of equation (2.24) Derivation of equation (2.29) Derivation of equation (2.30) Maxima source code Maxima source code for a PEC-SI Maxima source code for a PMC-SI.