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SLOT ULTRA WIDEBAND (UWB) ANTENNA

MUSFIRAH BT HILMI

This report is submitted in partial fulfillment of the requirements for the award of Bachelor of Electronic Engineering (Telecommunication Electronics) With Honours

Faculty of Electronic and Computer Engineering Universiti Teknikal Malaysia Melaka

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UNIVERSTI TEKNIKAL MALAYSIA MELAKA

FAKULTI KEJURUTERAAN ELEKTRONIK DAN KEJURUTERAAN KOMPUTER

BORANG PENGESAHAN STATUS LAPORAN

PROJEK SARJANA MUDA II

Tajuk Projek : SLOT ULTRA WIDEBAND (UWB) ANTENNA Sesi

Pengajian : 2008/2009

Saya MUSFIRAH BINTI HILMI

mengaku membenarkan Laporan Projek Sarjana Muda ini disimpan di Perpustakaan dengan syarat-syarat kegunaan seperti berikut:

1. Laporan adalah hakmilik Universiti Teknikal Malaysia Melaka.

2. Perpustakaan dibenarkan membuat salinan untuk tujuan pengajian sahaja.

3. Perpustakaan dibenarkan membuat salinan laporan ini sebagai bahan pertukaran antara institusi pengajian tinggi.

4. Sila tandakan ( ) :

SULIT*

(Mengandungi maklumat yang berdarjah keselamatan atau kepentingan Malaysia seperti yang termaktub di dalam AKTA RAHSIA RASMI 1972)

TERHAD* (Mengandungi maklumat terhad yang telah ditentukan oleh

organisasi/badan di mana penyelidikan dijalankan)

TIDAK TERHAD

Disahkan oleh:

__________________________ ___________________________________

(TANDATANGAN PENULIS) (COP DAN TANDATANGAN PENYELIA)

Alamat Tetap:

49 JALAN USJ 4/6G

47600 SUBANG JAYA

Tarikh: ………. Tarikh: ………..

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iii   

“I hereby declare that this report is the result of my own work except for quotes as cited in the references.”

Signature :………. Author : MUSFIRAH BINTI HILMI

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iv   

“I hereby declare that I have read this report and in my opinion this report is sufficient in terms of the scope and quality for the award of Bachelor of Electronic Engineering

(Telecommunication Electronics) With Honours.”

Signature :……….

Supervisor’s Name :MOHAMAD ZOINOL ABIDIN ABD AZIZ Date :……….

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v   

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ACKNOWLEDGEMENT

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vii   

ABSTRACT

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ABSTRAK

Sejak Suruhanjaya Komunikasi Persekutuan (FCC) melancarkan jalur lebar berfrekuensi 7.5 GHz (dari 3.1 GHz hingga 10.6 GHz), untuk komunikasi wayarles

Ultra Wideband (UWB)” , UWB berkembang dengan pantas sebagai kadar data tinggi

dalam komunikasi wayarles teknologi. UWB teknologi menjadi keperluan dalam sistem komunikasi disebabkan oleh permintaan yang tinggi untuk kapasiti data yang besar serta kadar penghantaran yang mempunyai kelajuan yang tinggi. Terdapat beberapa jenis antena UWB seperti antena dwikutub, bow-tie, TEM horn, slot antena UWB, antenna

planar dan array. Projek ini bertujuan membina slot antena UWB. UWB antenna

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ix   

TABLE OF CONTENT

CHAPTER

I

TITLE

PROJECT TITLE

THESIS STATUS DECLARATION RESEARCHER’S DECLARATION SUPERVISOR’S DECLARATION DEDICATION

ACKNOWLEDGEMENT ABSTRACT

ABSTRAK

TABLE OF CONTENTS LIST OF TABLES LIST OF FIGURES

LIST OF ABBREVIATIONS LIST OF APPENDICES

INTRODUCTION

1.1 Introduction 1.2 Objectives

1.3 Problem Statement 1.4 Scope Of Work 1.5 Methodology

PAGE

i ii iii iv v vi vii viii ix xiii xiv xvii xix

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x   

II BACKGROUND STUDY

2.1 Introduction to Ultra Wideband (UWB) 2.1.1 Background

2.2 Antenna Theory

2.2.1 Parameters of an Antenna 2.2.1.1 Radiation Pattern 2.2.1.2 Directivity 2.2.1.3 Gain

2.2.1.4 Frequency Bandwidth 2.2.2 Requirements for UWB antenna 2.3 Coplanar Waveguide (CPW)

2.3.1 History of coplanar waveguide 2.3.2 Types of coplanar waveguide

2.3.2.1 Coplanar Waveguide

2.3.2.2 Grounded Coplanar Waveguide 2.3.3 Advantages and disadvantages of coplanar waveguide

2.4 Types of Slot Ultra Wideband (UWB) Antenna Reviewed

2.4.1 Coplanar Waveguide-Fed Rectangular Slot Antenna

2.4.2 Elliptical Slot Antenna 2.4.3 T Slots Antenna

2.4.4 Cross Slot Antenna with U-Shaped Tuning Stub 2.4.5 Circular and Elliptical CPW-Fed Slot Antenna 2.4.6 Microstrip-Line-Fed Printed Planar Slot Antenna 2.4.7 Microstrip Square-Ring Slot Antenna

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III

IV

Stub

2.4.9 Microstrip Square-Ring Slot Antenna Filled by an H-Shape Slot

2.4.10Rectangular Slot Antenna with Patch Stub

SLOT ULTRA WIDEBAND (UWB) ANTENNA

3.1 Introduction 3.2 Antenna Geometry

3.2.1 Parameter Analysis 3.2.1.1 Rectangular Slot 3.2.1.2 U-shaped stub

3.2.1.3 Center Conductor Width, Wf

3.2.1.4 Slot Width, WS

3.2.1.5 Width, A

3.2.1.6 Distance Between Slot and U-shaped, B

3.2.1.7 Width, C

3.2.2 Optimal Dimension of Design I

3.2.3 Adding Element at the Center of the Slot 3.2.4 Different Shape of Slot Antenna

3.3 Fabrication

3.4 Measurement Setup

RESULT ANALYSIS AND DISCUSSION

4.1 Parameter Analysis Result

4.1.1 Effect of the rectangular slot 4.1.2 Effect of the U-shaped stub

4.1.3 Effect of the center conductor width, Wf

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xii   

V

4.1.4 Effect of the slot width, WS

4.1.5 Effect of the width, A

4.1.6 Effect of the distance between slot and U-shaped,

B

4.1.7 Effect of the width, C

4.1.8 Optimal Design after Alteration 4.2 Simulation Results

4.2.1 Return Loss and Frequency Bandwidth 4.2.2 Radiation Pattern

4.2.3 Antenna Gain and Directivity 4.3 Measured Result

4.3.1 Return Loss and Frequency Bandwidth 4.3.2 Radiation Pattern

4.3.3 Antenna Gain

CONCLUSION

5.1 Conclusion 5.2 Future Work

REFERENCES

APPENDICES

44 44 45

45 46 47 47 48 49 50 50 52 55

56 57

58

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LIST OF TABLES

TABLE

3.1 3.2 3.3 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

TITLE

Dimension of rectangular slot antennas Optimal dimension for Design I

Optimal dimension of slot antennas

Simulated -10 dB bandwidth printed slot antennas Half Power Beamwidth

Antenna gains for Design I and Design II

Simulated -10 dB bandwidth printed slot antennas for Design I Simulated -10 dB bandwidth printed slot antennas for Design II Half Power Beamwidth for Design I

Half Power Beamwidth for Design II Antenna Gain for Design I and Design II

PAGES

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xiv   

LIST OF FIGURES

FIGURE 1.1 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 2.12 2.13 2.14 TITLE

Flow Chart of Methodology Antenna as a transition device

Radiation lobes and beamwidths of an antenna pattern

Linear Plot Of Power Pattern And Its Associated Lobes And Beamwidths

Coplanar Waveguide

Grounded Coplanar Waveguide

Geometry of the CPW-Fed rectangular slot antenna (units in mm) Geometry of the printed elliptical slot antenna

Geometry and Coordinate System of the T Slots Antenna Geometry of the cross slot antenna

Geometry of the proposed CPW-fed slot antenna configuration Geometry of printed planar slot antenna

Geometry of the SSRSA antenna

Geometry of the rectangular slot antenna Geometry of the square-ring slot antenna

The geometry and parameters of the rectangular slot antenna with

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xv    3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 patch stub

Geometry of CPW fed of Design I

Return Loss Simulation Result for Rectangular Slot Antenna Alteration of the rectangular slot

Alteration of the U-shaped stub

Alteration of the center conductor width, Wf

Alteration of the slot width, Ws

Alteration of the width, A

Alteration of the length between slot and U-shaped, B

Alteration of the width, C

Geometry of the Antenna When Adding Elements Geometry of Design II

The Antenna Layout

Fabricated CPW-Fed Slot Antenna The Fabrication Process

Network Analyzer Setup Measurement Setup

Return Loss Simulation Result of rectangular slot for different length

Return Loss Simulation Result of rectangular slot for different width

Return Loss Simulation Result for different length of U-shaped stub

Return Loss Simulation Result for different width of U-shaped stub

Return Loss Simulation Result for different Wf

Return Loss Simulation Result for different Ws

Return Loss Simulation Result for different width, A of U-shaped stub

Return Loss Simulation Result for different length, B

Return Loss Simulation Result for different width, C

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4.10 4.11 4.12 4.13 4.14 4.15 4.16

Return Loss Simulation Result for optimal design Return Loss Simulation Result

Radiation Patterns Simulation Result Return Loss Simulation Result for Design I Return Loss Simulation Result for Design II Radiation patterns of Design I

Radiation patterns of Design II

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xvii   

LIST OF ABBREVIATIONS

1G 2G 3G 4G A ABW AWGN B C CPW CPWG CST dB dBi FBW FCC FDTD FR4 GHz - - - - - - - - - - - - - - - - - - - First-generation Second-generation Third-generation Fourth-generation Width of Stub Absolute Bandwidth

Additive White Gaussian Noise Distance between slot and U-shaped Width of Stub

Coplanar Waveguide

Coplanar Waveguide with Ground Computer Simulation Technology Decibel

Decibel above isotropic Fractional Bandwidth

Federal Communications Commission Finite-difference Time-domain

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xviii    GPS GSM IEEE ISM L MHz MIC mm MMIC MSRSA PCB SNR SRSA SSRSA UMTS UWB VSWR W Wf WS Wi-Fi WLAN WPAN - - - - - - - - - - - - - - - - - - - - - - -

Global Positioning System

Global System for Mobile Communication Institute of Electrical and Electronics Engineers Industrial Scientific and Medicine

Length Mega Hertz

Microwave Integrated Circuit millimeter

Monolithic Microwave Integrated Circuit Microstrip Square-Ring Slot Antenna Printed Circuit Board

Signal-to-Noise Ratio Square-Ring Slot Antenna Split Square Ring Slot Antenna

Universal Mobile Telecommunications System Ultra Wideband

Voltage Standing Wave Ratio Width

Center Conductor Width Slot Width

Wireless Fidelity

Wireless Local Area Network Wireless Personal Area Network

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xix   

LIST OF APPENDICES

APPENDIX

A B C D

TITLE

Advantages of UWB UWB applications Microstrip

Results for Adding Element at the Center of the Slot

PAGES

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CHAPTER I

INTRODUCTION

1.1Introduction

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In recent years, more interest has been put into wireless personal area network (WPAN) technology worldwide. The future WPAN aims to provide reliable wireless connections between computers, portable devices and consumer electronics within a short range. Furthermore, fast data storage and exchange between these devices will also be accomplished. This requires a data rate which is much higher than what can be achieved through currently existing wireless technologies [1].

The maximum achievable data rate or capacity for the ideal band-limited additive white Gaussian noise (AWGN) channel is related to the bandwidth and signal-to-noise ratio (SNR) by Shannon-Nyquist criterion [2], as shown in Equation 1.1.

1 1.1

where C denotes the maximum transmit data rate, B stands for the channel bandwidth.

Equation 1.1 indicates that the transmit data rate can be increased by increasing the bandwidth occupation or transmission power. However, the transmission power cannot be readily increased because many portable devices are battery powered and the potential interference should also be avoided. Thus, a large frequency bandwidth will be the solution to achieve high data rate.

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1.2Objectives

The main objective of this project is to design and implement slot Ultra Wideband (UWB) antenna for UWB application. The UWB antenna should be capable of operating over an ultra wide bandwidth as allocated by the FCC with bandwidth requirement from 3.1GHz to 10.6GHz and return loss below than -10dB.

1.3Problem Statement

In recent years, there has been an increase in the demand of large capacity of data and high speed data transmission rate. The limited bandwidth for wireless communication system is a drawback for the requirement of large capacity of data rate [1]. Besides the demand for small size and compact profile antennas, broadband ones are often required in order to cover simultaneously several bands. UWB is rapidly advancing as a high data rate wireless communication technology [4]. A slot UWB antenna is designed to have a larger bandwidth with large capacity of data and high speed data transmission rate.

1.4Scope Of Work

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1.5Methodology

This project involves five major phase as shown in Figure 1.1. Firstly, a literature review was carried out from various sources such as journals, articles, books, and technical reports on UWB antenna. All the basic parameters such as its shape, dimensions, and all the mathematical parameters like its return loss, wavelength, directivity, VSWR and etc is analyzed and comprehended.

Then, the slot UWB antenna is designed by using planar slot structure. The UWB antenna should be capable of operating over an ultra wide bandwidth from 3.1GHz to 10.6GHz.

The CST software implementation is studied to design the antenna. The design that has been made with all parameters attained is then simulated using CST to analyze the antenna performance in order to obtain the return loss, frequency bandwidth, gain, directivity, and radiation pattern. If the design is not achieved a good performance, the design is being altered or redesign.

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[image:24.612.266.454.65.377.2]

5   

Figure 1.1 Flow Chart of Methodology

Literature Review

Design the antenna

Simulate using CST

Fabrication

Measurement

Writing report

Figure

Figure 1.1 Flow Chart of Methodology

References

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