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Views 6, Downloads 5, File size 5MB. Indoor jum. An underground antenna near the ground a. Impossibility of a good ground connection a. All rights reserved. Published simultaneously in Canada. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning, or otherwise, except as permitted under Section or of the United States Copyright Act, without either the prior written permission of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, Inc.
No warranty may be created or extended by sales representatives or written sales materials. The advice and strategies contained herein may not be suitable for your situation. You should consult with a professional where appropriate. For general information on our other products and services please contact our Customer Care Department within the U. Wiley also publishes its books in a variety of electronic formats.
Some content that appears in print, however, may not be available in electronic format. ISBN cloth 1. Microwave antennas. Antenna arrays. Frequency selective surfaces. M53M88 The constant support of the Electroscience Laboratory and my family—in particular, my wife Aase—is deeply appreciated. Radiation from Surface Waves? Professor Ben Munk has no problems in either regard. In this book, Ben treats a number of subjects related to antennas and both their intended usage as transmission or reception devices, as well as the important these days radar cross section RCS that they can contribute.
Sad to say, Ben has been able to document all too many examples to prove his point. All this is not intended in any way to say that powerful computers are useless. Far from it. Without the use of such machines, much of the work described herein could not have been done in a lifetime, but the approach has to be controlled by investigators who understand the physics and electromagnetic realities that make a solution truly optimal and practical.
Here he further applies this approach and gives many examples of problems solved by himself and his graduate associates, with the goal of teaching by practical example. This is done by walking the reader, case by case, through the basic technology that applies, then to a logical solution. He then gives hard results to validate what was done, and then, to quickly bring the reader up to speed, he provides a problem or two for solution without further guidance.
Throughout all this, Ben uses his wonderful sense of humor to make various points, which goes a long way in making this book anything but tedious. Saying that about a book on heavy electromagnetic theory and design is certainly a far cry from the usual.
He calls a spade a spade, for sure, and there may well be some who, though unnamed, might feel a twinge after reading these sections. Highly recommended! Bahret was with the United States Air Force but is now retired. From the early s he sponsored numerous projects concerning radar cross section of airborne platforms—in particular, antennas and absorbers.
Under his leadership grew many of the concepts used extensively today—for example, the metallic radome. In fact he is considered by many to be the father of stealth technology. The information contained in this book is going to change the way that large, broadbanded arrays are designed. This also leads to new insights in the area of antenna scattering. I strongly recommend it to the designers of such arrays. A simple example of why I make this comment comes to mind. I was reading the papers in the December IEEE Magazine which discuss the transmission of power to earth from space.
Several problems with interference created by reradiation of energy at harmonic frequencies were discussed. I could see potential cures simply from scanning the initial chapters.
I would also be interested in applying these concepts to my current research namely, time-domain groundpenetrating radar GPR. Some neat antennas may become practical.
In reading it, I would turn pages and simply agree with many of the concepts. At this time I have only scanned some of the chapters of the present book. Neither of us ever paid up. These points are provocative to those readers with an interest in antenna scattering and should make those readers think carefully about them but most of them are resolved when one recalls that the emphasis of this book is on arrays.
This book is a must for anyone involved in the design of large arrays. I fully intend to read it very carefully after it is published. The problem is in reality created by the necessity of security.
Leon Peters, Jr. From the early s he worked on, among many other things, RCS problems involving antennas and absorbers. In fact, he became my supervisor when I joined the group in the mids. The approach to engineering design has changed considerably over the last decades. You would then try to express the problem in mathematical form. The beauty here was, of course, that it then often was quite simple to determine the location of the extreme values such as the maxima and minima as well as nulls and asymptotic behavior.
You would then, in many cases, be able to observe which parameters were pertinent to your problem and in particular which were not. It was then followed by actual calculations and eventually by a meaningful parametric study that took into account what was already observed earlier.
The problem with this approach was, of course, that it required engineers and scientists with considerable insight and extensive training I deliberately did not say experience, although it helps. It is therefore quite understandable that when the purely numerical approaches appeared on the scene, they soon became quite popular.
Most importantly, only a minimum of physical insight was required or so it was thought. The computers would be so fast that they would be able to calculate all the pertinent cases. These would then be sorted out by using a more or less sophisticated optimization scheme, and the results would be presented on a silver platter completely untouched by the human mind. It would be incorrect to state that the numerical approach has failed. It has in many cases produced remarkable results.
However, the author is keenly aware of several cases that have been the subject of intense investigation for years and still have not produced a satisfactory solution, although some do exist—most often xxi xxii PREFACE because the computer has been directed to incorporate all kinds of parameters that are alien to this particular problem.
Or lack of physical insight has prevented the operator from obtaining a meaningful parametric study—for example, in cases where a solution does not exist in the parametric space considered. The author has watched this development with considerable concern for several years. An actual optimization was not possible because of the excessive computer time involved. That almost sounds like an echo of other similar statements coming from the numerical camp.
A partial remedy for this calamity would be, of course, to give the students a better physical understanding. However, a fundamental problem here is that many professors today are themselves lacking in that discipline. The emphasis in the education of the younger generation is simply to write a computer program, run it, and call themselves engineers! The result is that many educators and students today simply are unaware of the most basic fundamentals in electromagnetics.
However, there are strong signals from the readers out there that they more and more appreciate the analytic approach based on physical understanding followed up by a mathematical analysis. It is hoped that this second book will be appreciated as well. The author shared this preface with some of his friends in the computational camp. All basically agreed with his philosophy, although one of them found the language a bit harsh! However, another informed him before reading this preface that design by optimization has lately taken a back seat as far as he was concerned.
Today, he said, there is a trend toward understanding the underlying mathematics and physics of the problem. Welcome to the camp of real engineering. They were always ready with consultation and advice. That will not be forgotten. Further support and interest in my work was shown by Dr.
Brian Kent, Dr. Stephen Schneider, and Mr. Ed Utt from the U. Air Force. Fortunately, the U. Navy needed our help in designing very broadbanded bandstop panels. The help and advice from Mr. Jim Logan, Dr. John Meloling, and Dr. John Rockway is deeply appreciated. However, the most discussed subject was the Broadband Array Concept. William Croswell and Mr.
A periodic surface is an assembly of identical elements arranged in a one or two-dimensional array. Such surfaces have various effects on incident electromagnetic waves. Their applications range from antennas to stealth aircraft. This book discussesMoreA periodic surface is an assembly of identical elements arranged in a one or two-dimensional array. This book discusses finite antenna arrays and how to minimize the radar cross section of these arrays.
A periodic surface is an assembly of identical elements arranged in a one or two-dimensional array. Such surfaces have various effects on incident electromagnetic waves. Their applications range from antennas to stealth aircraft. This book discussesMoreA periodic surface is an assembly of identical elements arranged in a one or two-dimensional array. This book discusses finite antenna arrays and how to minimize the radar cross section of these arrays. Ben has been the world-wide guru of this technology
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Performance optimization of microstrip antenna array using frequency selective surfaces. Valdez A. Campos II. This paper presents the application of frequency selective surfaces in antenna arrays as an alternative to improve radiation parameters of the array. Several parameters have been significantly improved, in particular the bandwidth, gain and radiation efficiency, compared with a conventional array.
Munk This book is printed on acid-free paper. Published simultaneously in Canada. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any. MA , , fax , or on the web at www.
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