Electromagnetics Explained.pdf

ELECTROMAGNETICS

EXPLAINED

A HANDBOOK FOR WIRELESS/RF, EMC, AND

HIGH-SPEED ELECTRONICS

Ron Schmitt

An imprint of Elsevier Science

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Newnes is an imprint of Elsevier Science.

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Library of Congress Cataloging-in-Publication Data

Schmitt, Ron.

Electromagnetics explained: a handbook for wireless/RF, EMC, and high-speed

electronics / Ron Schmitt.

p. cm.

Includes bibliographical references and index.

ISBN 0-7506-7403-2 (hc.: alk. paper)

1. Electronics. 2. Radio. 3. Electromagnetic theory. I. Title.

TK7816 .S349 2002

621.381—dc21

2001055860

British Library Cataloguing-in-Publication Data

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ACKNOWLEDGMENTS

First and foremost, I want to thank my wife, Kim Tripp. Not only did

she give me love and patient support, she also typed in the references

and drew many of the ﬁgures. For this, I am greatly indebted. I also want

to thank my family, and particularly wish to thank my mother, Marion

Schmitt, who provided the cover art and the drawings of hands and

human ﬁgures in Chapter 3.

I am very thankful for the help of Dr. Laszlo Kish, for being a col-

league and a friend, and most of all, for being my mentor. He had the

patience to answer so many of my endless questions on electromagnet-

ics, quantum physics, and physics in general. My bosses at SRD also

deserve special mention: Mr. Carl Freeman, President; Dr. Greg Grillo,

Vice President; and Dr. Jeremy Hammond, Director of Engineering

Systems. Thanks to my friends at SRD for the most enjoyable years of

my career.

This book wouldn’t have been possible without the help of the great

people at Newnes, particularly Candy Hall, Carrie Wagner, Chris Conty,

Jennifer Packard, and Kevin Sullivan. Joan Lynch was instrumental to

the success of this book by connecting me with Newnes. The readers of

EDN, whose interest motivated me to write this book, deserve acknowl-

edgment, as do my friends at Nortel Networks, where I wrote the ﬁrst

article that started this whole process.

Many people provided me with technical assistance in the writing.

Roy McCammon pointed out that I didn’t understand electromagnetics

as well as I thought I did, especially in regard to surface waves in trans-

mission lines. Dr. Keith Hardin provided me with his wonderful thesis

on asymmetric currents and their relation to common-mode radiation.

Dr. Clayton Paul examined my shielding plots and conﬁrmed their cor-

rectness. Dr. Mark Rodwell provided me with insights on the state-of-

the-art in ultra-high-speed electronics. Dr. Paul Horowitz told me about

the strange problems involving cable braids at high frequencies. Dr.

Thomas Jones and Dr. Jeremy Smallwood gave answers to questions

regarding static electricity. Dr. Istvan Novak provided information on

xvi

ACKNOWLEDGEMENTS

decoupling in high-speed digital systems. Dr. Allan Boardman answered

several of my questions regarding electromagnetic surface waves. Dr.

Tony Heinz helped me answer some questions regarding transmission

lines in the infrared and beyond. I also wish to thank Nancy Lloyd,

Daniel Starbird, and Julie Frost-Pettengill.

I want to thank all the people who reviewed my work: Don McCann,

John Allen, Jesse Parks, Dr. Neil Comins, Les French, Dr. Fred Irons, Dr.

Dwight Jaggard, and my anonymous reviewer at EDN. Finally, I extend

thanks to everyone who made other small contributions and to anyone

I may have forgotten in this list.

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