A COMPACT SIW RADIATING BANDPASS FILTER FOR C-BAND APPLICATIONS
Thesis is presented in partial fulfillment for the award of the Bachelor of Engineering (Hons.) Electronics (Communication)
UNIVERSITI TEKNOLOGI MARA (UiTM)
MOHD 'IZZUL 'IMRAN BIN ISMAIL
FACULTY OF ELECTRICAL ENGINEERING UNIVERSITI TEKNOLOGI MARA
40450 SHAH ALAM, SELANGOR, MALAYSIA
JULY 2014
ACKNOWLEDGEMENTS
First, I would like to say Alhamdulillah and thanks to ALLAH for giving me health and the strength that finally, I managed to complete this Degree's project within the given time.
I would like to express my gratitude and special thanks to my project supervisor, Madam Noor Hasimah bt Baba for her supports, guidance and advices from the beginning until the completion of this project. I also wish to thank the Antenna Research Group (ARG) for providing measurement facilities and the authority of Electronics (Communication) department of Faculty of Electrical Engineering, Universiti Teknologi MARA Shah Alam for their guidance and valuable suggestions throughout this research. I am deeply indebted to my family members for their prayers, support and encouragement throughout the project progression.
Lastly, grateful acknowledgements to my friends for their help, cooperation and moral support and also sharing some idea in completing this project. Thank You.
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ABSTRACT
This paper presents a design of integrated Substrate Integrated Waveguide (SIW) filter and microstrip rectangular patch antenna using multilayer technique on the Printed Circuit Board (PCB). The filtering and radiating element are designed for C- band applications at 4 GHz center frequency. The circular cavity structure using TMoio mode for filter and rectangular antenna are used in the design. To realize the technique, modes of SIW filter and microstrip antenna are coupled using rectangular aperture at common ground plane. The simulation results show good antenna gain and radiation pattern that proved the capability to integrate SIW filter and microstrip antenna directly without requirement of external matching, thus reduce the overall size of the device. To prove the concept, the multilayer structure is fabricated using Rogers RO3003 with dielectric constant, er = 3. The measured results show a good agreement with the simulated results and the size is compact with overall physical dimension of 65mm x 40.9mm x 1.285mm.
TABLE OF CONTENTS
DECLARATION i DEDICATION ii ACKNOWLEDGEMENT iii
ABSTRACT iv TABLE OF CONTENT v
LIST OF FIGURES viii LIST OF TABLES xi LIST OF SYMBOL AND ABBREVIATIONS xii
CHAPTER 1 : INTRODUCTION 1
1.0 Introduction 1 1.1 Background of Study 1
1.2 Problem Statement 2
1.3 Objectives 3 1.4 Scope of Work 3 CHAPTER 2 : LITERATURE REVIEW 4
2.0 Introduction 4 2.1 Substrate Integrated Waveguide (SIW) 4
2.1.1 SIW Operation Principles 5 2.2 Development of SIW Technology 7
2.3 Filter 10 2.4 Filter Antenna For Wireless Communication 13
2.5 Microstrip Patch Antenna 16 CHAPTER 3 : METHODOLOGY 18
3.0 Introduction 18 3.1 Design Specification 18
3.2 Design Procedure 19 3.2.1 Resonant Frequency of SIW Filter 19
3.2.2 Microstrip Patch Antenna 20 v
3.2.3 Transition Between Planar Circuit and SIW 21 3.3 Integration Between SIW Filter And Microstrip Patch Antenna 23
3.4 Flowchart of The Design Process 24 3.5 Simulation Design Using CST Microwave Studio Software 25
3.5.1 Design Template 26 3.5.2 Unit Settings 27 3.5.3 Design Substrate of SIW Filter 28
3.5.4 Design Of Ground Plane 33 3.5.5 Design Integrated Structure of SIW Filter and Antenna 35
3.6 Simulation Process 37 3.6.1 Frequency Range 3 7
3.6.2 Boundary Condition 37 3.6.3 Waveguide Port 38 3.6.4 Farfield Monitor 40 3.6.5 Transient Solver 40 3.7 Fabrication Process 41 3.8 Measurement Using Vector Network Analyzer 42
CHAPTER 4 : RESULTS AND DISCUSSION 43
4.0 Introduction 43 4.1 SIW Bandpass Filter 43
4.2 Integrated Structure of SIW Filter and Microstrip Patch Antenna 45 4.3 Comparison Performance of the Integrated SIW Filter and Antenna
Between Simulation and Measurement 46
4.3.1 Return Loss (Sn) 48
4.3.2 Gain 49 4.3.3 Radiation Pattern 50
4.3.4 E-Field Distribution 52
4.4 Parametric Study 52 4.4.1 Size of Via Holes 52
4.4.2 Length of Inset Feed 54 4.4.3 Position of the Rectangular Patch Antenna 55
4.4.4 Size of the Rectangular Aperture 55
