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Arrays of Cylindrical Dipoles

Arrays of Cylindrical Dipoles
Author: R. W. P. King
Publisher: Cambridge University Press
Total Pages: 0
Release: 2009-06-25
Genre: Science
ISBN: 9780521114851

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In this book, first published in 1968, King and his co-authors develop a theory of the behaviour of arrays of rod-shaped antennas such as are used to achieve directive transmission and reception of radio waves for use in communication between points on the earth, between the earth and a space vehicle, or in radio astronomy. They use quantitative analysis of arrays of practical types and wide range of lengths over a wide frequency band, which makes possible the design of new arrays with desired characteristics. After the introductory chapter reviewing the foundations and conventions antenna theory, each subsequent chapter takes into account the authors own particular theories on isolated antennas, two-coupled antennas, N-element circular array, N-element curtain array of identical elements, to arrays containing elements of different lengths and finally to planar and three-dimensional arrays. The final chapter is concerned with problems of measurement and the correlation of theory with experiment.


Cylindrical Antennas and Arrays

Cylindrical Antennas and Arrays
Author: Ronold W. P. King
Publisher: Cambridge University Press
Total Pages: 650
Release: 2002-10-10
Genre: Science
ISBN: 1139437097

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This book explains how to design, analyse and test cylindrical antenna arrays from a practical engineering standpoint. Written by three of the leading engineers in the field, this book is destined to become established as the basic reference in the field for many years to come.


EM Design and Analysis of Dipole Arrays on Non-planar Dielectric Substrate

EM Design and Analysis of Dipole Arrays on Non-planar Dielectric Substrate
Author: Hema Singh
Publisher: Springer
Total Pages: 88
Release: 2015-10-12
Genre: Technology & Engineering
ISBN: 9812877819

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This book presents a simple and systematic description of EM design of antenna arrays. Printed dipole antennas are known to be simple yet more efficient than wire antennas. The dielectric substrate and the presence of ground plane affect the antenna performance and the resonant frequency is shifted. This book includes the EM design and performance analysis of printed dipole arrays on planar and cylindrical substrates. The antenna element is taken as half-wave centre-fed dipole. The substrate is taken as low-loss dielectric. The effect of substrate material, ground plane, and the curvature effect is discussed. Results are presented for both the linear and planar dipole arrays. The performance of dipole array is analyzed in terms of input impedance, return loss, and radiation pattern for different configurations. The effect of curved platform (substrate and ground plane) on the radiation behaviour of dipole array is analyzed. The book explains fundamentals of EM design and analysis of dipole antenna array through numerous illustrations. It is essentially a step-to-step guide for beginners in the field of antenna array design and engineering.


Low Profile Conformal Antenna Arrays on High Impedance Substrate

Low Profile Conformal Antenna Arrays on High Impedance Substrate
Author: Hema Singh
Publisher: Springer
Total Pages: 70
Release: 2015-09-28
Genre: Technology & Engineering
ISBN: 9812877630

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This book presents electromagnetic (EM) design and analysis of dipole antenna array over high impedance substrate (HIS). HIS is a preferred substrate for low-profile antenna design, owing to its unique boundary conditions. Such substrates permit radiating elements to be printed on them without any disturbance in the radiation characteristics. Moreover HIS provides improved impedance matching, enhanced bandwidth, and increased broadside directivity owing to total reflection from the reactive surface and high input impedance. This book considers different configurations of HIS for array design on planar and non-planar high-impedance surfaces. Results are presented for cylindrical dipole, printed dipole, and folded dipole over single- and double-layered square-patch-based HIS and dogbone-based HIS. The performance of antenna arrays is analyzed in terms of performance parameters such as return loss and radiation pattern. The design presented shows acceptable return loss and mainlobe gain of radiation pattern. This book provides an insight to EM design and analysis of conformal arrays. This book serves as an introduction for beginners in the design and analysis of HIS-based antenna arrays. It includes pictorial description of both planar and non-planar array design and the detailed discussion of the performance analysis of HIS-based planar and non-planar antenna array. It will prove useful to researchers and professionals, alike.


Study of Circular Arrays of Radial and Tangential Dipoles

Study of Circular Arrays of Radial and Tangential Dipoles
Author: C. H. Holmes
Publisher:
Total Pages: 406
Release: 1967
Genre: Anennas, Dipole
ISBN:

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The circular arrays investigated consist of N identical center-fed cylindrical dipoles which lie in the plane of a circle and whose centers are equally spaced around the circumference of the circle. In the case designated 'tangential arrays' the elements are placed tangential to the circle and in the case designated 'radial arrays' they are placed radial to the circle. This study first presents the derivation of the integral equations defining the vector potential over the surfaces of the elements. These equations are reduced to a single integral equation by using sequence terminal voltages. The Gaussian quadrature formula for numerical integration is used to solve the equation for each sequence. Methods of obtaining the sequence terminal admittances are also described. Experimental results are compared with theory for a driven monopole in a tangential array positioned on a ground-plane. Radiation patterns determined from the numerical currents are compared with those obtained from assumed sinusoidal currents. (Author).