Microwaves and Wireless Simplified Second Edition For a complete listing of theArtech House Microwave Library, turn to the back of this book. Microwaves and Wireless Simplified Second Edition Thomas S. Laverghetta artechhouse.com Library of Congress Cataloging-in-Publication Data Laverghetta, Thomas S. Microwaves and wireless simplified / Thomas S. Laverghetta.—2nd ed. p. cm.—(The Artech House microwave library) Includes bibliographical references and index. ISBN 1-58053-943-2 (alk. paper) 1. Microwave devices. 2. Microwave communication systems. I. Title. II. Series. TK7876.L382 2005 621.381’3—dc22 2005043575 British Library Cataloguing in Publication Data Laverghetta, Thomas S. Microwaves and wireless simplified.—2nd ed.—(Artech House microwave library) 1. Microwave devices 2. Microwave communication systems I. Title 621.3’813 ISBN 1-58053-943-2 Cover design by Igor Valdman © 2005 ARTECH HOUSE, INC. 685 Canton Street Norwood, MA 02062 All rights reserved. Printed and bound in the United States of America. No part of this book may be reproduced or utilized in any form or by any means, electronic or mechanical, in- cluding photocopying, recording, or by any information storage and retrieval system, with- out permission in writing from the publisher. All terms mentioned in this book that are known to be trademarks or service marks have been appropriately capitalized. Artech House cannot attest to the accuracy of this informa- tion. Use of a term in this book should not be regarded as affecting the validity of any trade- mark or service mark. International Standard Book Number: 1-58053-943-2 10 9 8 7 6 5 4 3 2 1 Contents Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . ix 1 Introduction . . . . . . . . . . . . . . . . . . . . . . 1 Reference 12 2 Microwave Applications . . . . . . . . . . . . . . . 13 2.1 Radar . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.1.1 Tracking and measurement applications. . . . . . . . . . 19 2.1.2 Imaging applications. . . . . . . . . . . . . . . . . . 19 2.1.3 Doppler radar. . . . . . . . . . . . . . . . . . . . . 22 2.2 Telephones and telephone systems. . . . . . . . . . . . . . 26 2.3 Telecommunications . . . . . . . . . . . . . . . . . . . 32 2.4 Navigational Technology (GPS). . . . . . . . . . . . . . . 42 2.5 Summary . . . . . . . . . . . . . . . . . . . . . . . . 48 Reference 48 MicrowavesandWirelessSimplified 3 Transmission Lines . . . . . . . . . . . . . . . . . . 49 3.1 Coaxial transmissionlines . . . . . . . . . . . . . . . . . 56 3.1.1 Flexible coaxial transmission line. . . . . . . . . . . . . 58 3.1.2 Semirigid cable . . . . . . . . . . . . . . . . . . . . 63 3.2 Strip transmission line (stripline) . . . . . . . . . . . . . . 67 3.3 Microstrip . . . . . . . . . . . . . . . . . . . . . . . . 71 3.4 Coplanar waveguide. . . . . . . . . . . . . . . . . . . . 74 3.5 Waveguide. . . . . . . . . . . . . . . . . . . . . . . . 77 3.6 Summary . . . . . . . . . . . . . . . . . . . . . . . . 83 Reference 85 4 Microwave Components . . . . . . . . . . . . . . . 87 4.1 Directional couplers. . . . . . . . . . . . . . . . . . . . 88 4.1.1 Monitor circuits . . . . . . . . . . . . . . . . . . . . 93 4.1.2 Leveling circuits . . . . . . . . . . . . . . . . . . . . 95 4.1.3 Power measurement . . . . . . . . . . . . . . . . . . 96 4.1.4 Reflectometers. . . . . . . . . . . . . . . . . . . . . 97 4.2 Quadrature hybrids . . . . . . . . . . . . . . . . . . . . 99 4.2.1 Matched detectors. . . . . . . . . . . . . . . . . . . 103 4.2.2 Combining amplifiers . . . . . . . . . . . . . . . . . 105 4.2.3 SPST switches . . . . . . . . . . . . . . . . . . . . 106 4.3 Power dividers. . . . . . . . . . . . . . . . . . . . . . 107 4.4 Detectors . . . . . . . . . . . . . . . . . . . . . . . . 112 4.5 Mixers . . . . . . . . . . . . . . . . . . . . . . . . . 119 4.5.1 Elements of a mixer circuit . . . . . . . . . . . . . . . 122 4.5.2 Signals in a mixer circuit. . . . . . . . . . . . . . . . 123 4.6 Attenuators . . . . . . . . . . . . . . . . . . . . . . . 126 4.7 Filters . . . . . . . . . . . . . . . . . . . . . . . . . 131 4.7.1 Bandpass filters. . . . . . . . . . . . . . . . . . . . 132 4.7.2 Lowpass filters . . . . . . . . . . . . . . . . . . . . 137 4.7.3 Highpass filters. . . . . . . . . . . . . . . . . . . . 140 4.8 Circulators and isolators . . . . . . . . . . . . . . . . . 141 4.9 Antennas . . . . . . . . . . . . . . . . . . . . . . . . 150 4.10 Amplifiers . . . . . . . . . . . . . . . . . . . . . . . 155 4.10.1 Low-Noise Amplifiers . . . . . . . . . . . . . . . . 159 Contents 4.10.2 Low-Level Linear Amplifiers. . . . . . . . . . . . . . 160 4.10.3 Power Amplifiers . . . . . . . . . . . . . . . . . . 160 4.11 Oscillators . . . . . . . . . . . . . . . . . . . . . . . 162 4.12 Summary . . . . . . . . . . . . . . . . . . . . . . . 169 5 Solid State Devices . . . . . . . . . . . . . . . . . 171 5.1 Microwave diodes . . . . . . . . . . . . . . . . . . . . 175 5.1.1 Schottky diodes. . . . . . . . . . . . . . . . . . . . 175 5.1.2 PIN diodes . . . . . . . . . . . . . . . . . . . . . 180 5.1.3 Tunnel diodes . . . . . . . . . . . . . . . . . . . . 183 5.1.4 Gunn diodes. . . . . . . . . . . . . . . . . . . . . 187 5.2 Microwave transistors. . . . . . . . . . . . . . . . . . . 189 5.2.1 Bipolar transistors . . . . . . . . . . . . . . . . . . 192 5.2.2 Field effect transistors (FETs). . . . . . . . . . . . . . 200 5.2.3 Heterojunction bipolar transistor (HBT) . . . . . . . . . 206 5.2.4 High electron mobility transistors (HEMTs). . . . . . . . 210 5.3 Solid-state techniques. . . . . . . . . . . . . . . . . . . 212 5.4 Summary . . . . . . . . . . . . . . . . . . . . . . . . 222 Reference 223 6 Microwave Materials . . . . . . . . . . . . . . . . 225 6.1 Definition of terms. . . . . . . . . . . . . . . . . . . . 226 6.2 Material requirements . . . . . . . . . . . . . . . . . . 236 6.3 Types of materials . . . . . . . . . . . . . . . . . . . . 238 6.3.1 Teflon fiberglass materials . . . . . . . . . . . . . . . 238 6.3.2 Non-PTFE materials . . . . . . . . . . . . . . . . . 243 6.3.3 Thermoset polymer composites . . . . . . . . . . . . . 245 6.4 Choice of materials. . . . . . . . . . . . . . . . . . . . 246 6.5 Summary . . . . . . . . . . . . . . . . . . . . . . . . 247 Glossary. . . . . . . . . . . . . . . . . . . . . . . 249 About the Author . . . . . . . . . . . . . . . . . . 259 Index . . . . . . . . . . . . . . . . . . . . . . . . 261 Preface Everytechnicalbookthatiswrittenhasadefinitelifetime.Thisistrueifitisa highlytheoreticalbookorabooksuchasthisone,whichsimplifiesahighly technicalfield.Thisiswhyyouseefirsteditions,secondeditions,andsoon. Thereisnothingwrongwiththisarrangementanditactuallyisanaturalpro- gressionsinceitkeepsthereaderup-to-datewiththemostrecentadvancesin a particular field. Thefirsteditionofthisbookwaspublishedin1998andsuchchaptersas Chapters 2, 5, and 6 (Microwave Applications, Solid State Devices, and MicrowaveMaterials,respectively)werebasedonwhattechnologywasavail- ablein1998.Thisisnowthetwenty-firstcentury,however,andmanythings havechangedsince1998.Chapters2,5,and6arethefocusofthissecondedi- tion,butChapters1,3,and4arealsorevisedtomakethefieldofmicrowaves muchmoreunderstandabletoanyonewhoisnotamicrowavetechnicianor engineer.ThathasalwaysbeentheobjectiveofMicrowavesandWirelessSim- plified—to present an easily understandable explanation of the topics of microwavesandwirelesscommunicationstoanyoneinmarketingoradver- tising or to anyone who just wants to know more about the subjects.
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