NOVEL MICROSTRIP ANTENNAS FOR MULTIBAND .NOVEL MICROSTRIP ANTENNAS FOR MULTIBAND AND WIDEBAND

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  • NOVEL MICROSTRIP ANTENNAS

    FOR MULTIBAND AND WIDEBAND

    APPLICATIONS

    A Thesis Submitted to

    The Graduate School of Engineering and Sciences of

    zmir Institute of Technology

    In Partial Fulfillment of the Requirements for the Degree of

    MASTER OF SCIENCE

    in Electronics and Communication Engineering

    by

    Gksenin BOZDA

    July 2014

    ZMR

  • We approve the thesis of Gksenin BOZDA

    Assoc. Prof. Dr. Alp KUTEPEL Department of Electrical and Electronics Engineering/Izmir Institute of Technology

    Assoc. Prof. Dr. Mustafa SEMEN Department of Electrical and Electronics Engineering/Yasar University

    Assit. Prof. Dr. Fatih YAMAN

    Department of Electrical and Electronics Engineering/Izmir Institute of Technology

    14 July 2014

    Assoc. Prof. Dr. Alp KUTEPEL Supervisor

    Department of Electrical and Electronics Engineering/ Izmir Institute of Technology

    Prof. Dr. M. Salih DNLEYC

    Head of the Department of

    Electrical and Electronics Engineering

    Prof. Dr. R. Turul SENGER

    Dean of the Graduate School of

    Engineering and Sciences

  • ACKNOWLEDGMENTS

    I would firstly like to express my sincere gratitude to my supervisor Assoc. Prof.

    Dr. Alp KUTEPEL not only for his guidance but also for his support, trust and

    encouragement during this study. I am very proud that I had the chance to work with

    him.

    I also appreciate to Assoc. Prof. Dr. Mustafa SEMEN for his useful comments

    and valuable advices throughout this study.

    I would like to thank to the member of my thesis committee Assist. Prof. Dr.

    Fatih YAMAN for his contribution.

    I would like to express my special gratitude to Asst. Prof. Dr. A. Sevin

    AYDINLIK BECHTELER for encouraging me to have graduate education, valuable

    information given by her during her lessons and leading to improve my laboratory

    skills.

    I wish also express my thanks to Assoc. Prof. Dr. Thomas F. BECHTELER for

    sharing his invaluable experiences especially in microwave measurement techniques.

    I would like to thank Izmir Institute of Technology, where I work as a research

    assistant, for the financial support.

    I am also grateful to smail Yldz for his cooperation in building up

    measurement systems, unfailing encouragement and never-ending friendship.

    I would also like to thank my father zcan BOZDA and my mother Perihan

    BOZDA for their endless support and sympathy. They really deserve every good

    intention.

    I thank specially to my girlfriend Bahar ZEN for her understanding, trust and

    encouragement throughout this study.

    Lastly, I would like to thank my colleagues, Deniz PALA, Burin GZEL, Dr.

    Osman Akn, Dr. lhan BATRK, Basri MUMCU, Bilal Orkan OLCAY, Baak Esin

    KKTRK, Tufan BAKIRCIGL, kr DURBA, Ufuk YCEL, Esra AYCAN,

    Oktay KARAKU and the others for their great support and friendship.

  • iv

    ABSTRACT

    NOVEL MICROSTRIP ANTENNAS FOR

    MULTIBAND AND WIDEBAND APPLICATIONS

    In this study, four novel microstrip antennas are designed for various wireless

    systems in two different types which are log periodic dipole array and planar monopole.

    In the first design, multiband behavior of standard printed log periodic dipole array

    antenna is converted to wideband by employing sub-sectional tapered feeding and the

    operating bandwidth is increased by using a feed point patch. By the way, the proposed

    antenna becomes capable of GPS (L1 and L2), PCS, IMT-2000, WLAN, WiMAX,

    UWB and X Band systems. The other designs are printed planar monopole antennas

    which have small size and low group delay. Microstrip inset feeding, sectional design

    and slot loading methods are basically used for these antennas. First printed planar

    monopole antenna is designed for WLAN, WiMAX, UWB and X Band applications by

    employing inset feeding and sectional design. In the second and the third printed

    monopole designs, slot loading technique is also employed. It provides both exciting

    extra resonance frequencies and keeping S11 performance below -10 dB level. In the

    second design, a novel slot geometry is implemented on the first printed monopole

    design for PCS band. Then, desired frequency resonance with required bandwidth is

    reached and the antenna becomes capable of PCS in addition to UWB and X Band. In

    the third design, another novel slot geometry is also implemented on the first printed

    monopole design for GPS band. Consequently, the antenna becomes capable of GPS in

    addition to WLAN, WiMAX, UWB and X Band.

  • v

    ZET

    OK BANTLI VE GEN BANTLI UYGULAMALAR N

    ZGN MKROERT ANTENLER

    Bu almada, eitli kablosuz sistemler iin log periyodik dipol dizi ve

    dzlemsel monopol olmak zere iki farkl tipte drt adet zgn mikroerit anten

    tasarlanmtr. lk tasarmda, standart basl log periyodik dipol dizi antenin ok bantl

    davran, alt-blml konik besleme kullanlarak geni bantl hale dntrm ve

    antenin alma bantgenilii bir besleme noktas yamas kullanlarak arttrlmtr.

    Bylece, nerilen anten GPS (L1 ve L2), PCS, IMT-2000, WLAN, WiMAX, UWB ve

    X Bant sistemleri iin uygun hale gelmitir. Dier tasarmlar kk boyutlara ve dk

    grup gecikmesine sahip basl dzlemsel monopol antenlerdir. Mikroerit ie doru

    besleme, blml tasarlama ve yark ykleme yntemleri geni bant ve ok bantl basl

    dzlemsel tek kutuplu anten tasarmlarnda temel olarak kullanlmtr. lk basl

    dzlemsel tek kutuplu anten WLAN, WiMAX, UWB ve X Bant sistemleri iin

    miktoerit ie doru besleme ve blml tasarlama methotlar kullanlarak

    tasarlanmtr. kinci ve nc tek kutuplu tasarmlarnda ise yark ykleme teknii de

    kullanlmtr. Bu teknik hem fazladan rezonans frekanslarnn uyarlmasnda hem de

    S11 perferomansnn -10 dB seviyesinin altnda tutulmasn salamtr. kinci tek

    kutuplu tasarmnda, PCS band iin zgn bir yark geometrisi ilk tek kutuplu anten

    tasarm zerine uygulanmtr. Ardndan, istenilen rezonans frekans gerekli

    bantgenilii ile birlikte elde edilmi ve anten UWB ve X Banda ek olarak PCS bandna

    da uygun bir hale gelmitir. nc tek kutuplu tasarmnda ise baka bir zgn yark

    geometrisi yine ilk tek kutuplu anten tasarm zerine GPS band iin uygulanmtr.

    Sonu olarak anten WLAN,WiMAX,UWB ve X Bantlarna ek olarak GPS band iin de

    uygun hale gelmitir.

  • vi

    TABLE OF CONTENTS

    LIST OF FIGURES ....................................................................................................... viii

    LIST OF TABLES ........................................................................................................... xi

    LIST OF ABBREVIATIONS ......................................................................................... xii

    CHAPTER 1. INTRODUCTION ..................................................................................... 1

    1.1. Overview of Microstrip Antennas ......................................................... 2

    1.2. Motivation and Thesis Objective ........................................................... 6

    CHAPTER 2. NUMERICAL METHOD ....................................................................... 13

    2.1. Finite Element Method ........................................................................ 14

    2.2. High Frequency Structure Simulator ................................................... 17

    CHAPTER 3. ANTENNA DESIGNS ............................................................................ 21

    3.1. Log Periodic Dipole Array Antenna .................................................... 21

    3.1.1. Design of Standard Printed LPDA Antenna .................................. 24

    3.1.1.1. Simulation Results of Standard Printed LPDA Antenna ...... 30

    3.1.2. Design of Sub-Sectional Tapered Fed Printed LPDA Antenna with

    a Feed Point Patch ......................................................................... 38

    3.1.2.1. Comparative Simulation Results of Designed Printed LPDA

    Antennas ............................................................................ 39

    3.1.3. Realization Process of Designed Antennas .................................... 44

    3.1.4. Measurement Process of Realized Antennas ................................. 48

    3.1.4.1. Network Analyzer Measurements ........................................ 48

    3.1.4.2. Anechoic Chamber Measurements ....................................... 50

    3.1.5. Simulation and Measurement Results for LPDAs ......................... 52

    3.2. Compact Printed Monopole Antennas ................................................. 61

    3.2.1. Simulation and Measurement Results for Design 1 ....................... 65

    3.2.2. Simulation and Measurement Results for Design 2 ....................... 73

  • vii

    3.2.3. Simulation and Measurement Results for Design 3 ....................... 80

    CHAPTER 4. CONCLUSIONS ..................................................................................... 88

    REFERENCES ............................................................................................................... 91

  • viii

    LIST OF FIGURES

    Figure Page

    Figure 1.1. Basic configuration of Microstrip Patch Antenna ......................................... 4

    Figure 1.2. Model Printed Antennas ....................................................

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