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Broadband Microstrip Antennas

For a listing of recent titles in the Artech House Antennas and Propagation Library, turn to the back of this book.

Broadband Microstrip Antennas

Girish Kumar

K. P. Ray

Artech House

Boston London www.artechhouse.com

Library of Congress Cataloging-in-Publication Data

Kumar, Girish.

Broadband microstrip antennas / Girish Kumar and K.P. Ray. p. cm. — (Artech House antennas and propagation library)

Includes bibliographical references and index. ISBN 1-58053-244-6 (alk. paper)

1. Microstrip antennas. I. Ray, K. P. II. Title.

TK7871.67.M5 K85

2003

621.382’4—dc21

2002033256

British Library Cataloguing in Publication Data

Kumar, Girish

Broadband microstrip antennas. — (Artech House antennas and propagation library) 1. Microstrip antennas 2. Broadband communication systems I. Title

II. Ray, K. P. 621.3’824

ISBN 1-58053-244-6

Cover design by Gary Ragaglia

2003 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, including photocopying, recording, or by any information storage and retrieval system, without 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 information. Use of a term in this book should not be regarded as affecting the validity of any trademark or service mark.

International Standard Book Number: 1-58053-244-6

Library of Congress Catalog Card Number: 2002033256

10 9 8 7 6 5 4 3 2 1

To our family members

Contents

 

Foreword

xvii

 

Preface

xix

 

Acknowledgments

xxiii

1

An Introduction to Microstrip Antennas

1

1.1

Introduction

1

1.2

Characteristics of MSAs

3

1.2.1

Advantages

3

1.2.2

Disadvantages

3

1.2.3

Applications of MSAs

4

1.3

Feeding Techniques

4

1.4

Methods of Analysis

7

1.4.1

Transmission Line Model

8

1.4.2

Cavity Model

8

1.4.3

MNM

9

1.4.4

MoM

9

1.4.5

FEM

10

vii

viii Broadband Microstrip Antennas

1.4.6

SDT

10

1.4.7

FDTD Method

10

1.5Review of Various Broadband Techniques for

 

MSAs

11

1.5.1

Definition of BW

11

1.5.2

Modified Shape Patches

14

1.5.3

Planar Multiresonator Configurations

14

1.5.4

Multilayer Configurations

15

1.5.5

Stacked Multiresonator MSAs

17

1.5.6Impedance-Matching Networks for Broadband

 

MSAs

17

1.5.7

Log-Periodic MSA Configurations

17

1.5.8

Ferrite Substrate-Based Broadband MSAs

18

1.6

Broadband Compact MSAs

18

1.7

Tunable and Dual-Band MSAs

19

1.8

Broadband Circularly Polarized MSAs

20

1.9

Broadband Planar Monopole Antennas

20

1.10

Summary

21

 

References

21

2

Regularly Shaped Broadband MSAs

29

2.1

Introduction

29

2.2

RMSAs

30

2.2.1

Parametric Study of RMSAs

39

2.2.2

Higher Order Modes of RMSA

52

2.2.3

Orthogonal Feeds for Dual Polarization

55

2.2.4

Circularly Polarized RMSA

58

2.2.5

Broadband Suspended RMSA

58

2.2.6

Broadband Thick RMSA with Various Probes

61

2.2.7

Frequency and Impedance Scaling of RMSA

63

 

Contents

ix

2.3

CMSAs

65

2.3.1

Resonance Frequency

66

2.3.2

Input Impedance and Voltage Distribution

67

2.3.3

Radiation Pattern

69

2.3.4

Effect of Loss Tangent

69

2.3.5

Broadband CMSAs

71

2.3.6

Analysis of Higher Order Modes

71

2.3.7

Circularly Polarized CMSAs

73

2.3.8

Dual-Orthogonal Feed CMSAs

73

2.4

Semicircular MSAs

74

2.4.1

Input Impedance and Voltage Distribution

75

2.4.2

Radiation Pattern

76

2.4.3

Broadband SCMSAs

77

2.4.4Analysis of Higher Order Modes of the

 

SCMSAs

78

2.5

ETMSAs

79

2.6

30°-60°-90° Triangular MSAs

83

2.7

Annular Ring MSAs

84

2.8Comparison of Various Configurations for

 

Broad BW

84

2.9

Summary

86

 

References

86

3

Planar Multiresonator Broadband MSAs

89

3.1

Introduction

89

3.2Mechanism of Parasitic Coupling for Broad

 

BW

90

3.3

Gap-Coupled RMSAs

90

3.3.1

Radiating-Edge Gap-Coupled RMSAs

91

3.3.2

Nonradiating-Edge Gap-Coupled RMSAs

102

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