Design and Analysis of a Compact Multi-band UWB-MIMO Antenna
- Issued Date
- 2015
- Abstract
- Design and Analysis of a Compact Multi-band UWB-MIMO Antenna
Martins Chidozie Ezuma
Advisor: Prof. Jae-Young Pyun, Ph.D.
Dept. of Information and Communication Engineering.
Graduate School of Chosun University
The Ultra-wide band (UWB) communication technology has received so much publicity over the years as the most efficient solution for short distance data intensive wireless communication. This is mainly because of the enormous unlicensed bandwidth assigned by the federal communications commission (FCC) for UWB communication. Also, the UWB technology is well suited for high data rate communications like multimedia video streaming. Furthermore, as the world welcomes the dawn of the Internet of Things (IoT) era, UWB communication is regaining some renewed attention for indoor location based systems, home networking systems and intra-body communications for medical healthcare systems. In these application areas, device manufacturers are interested in making their devices very portable and equipped with high data rate connectivity. The UWB technology meets these requirements.
This thesis presents the design and analysis of an innovative two-port Ultra-wide band multiple-input-multiple-output (UWB-MIMO) antenna for multiband wireless application. The proposed MIMO antenna achieves a higher diversity than a single monopole antenna and is thus suitable for high speed wireless applications. In order to design the MIMO antenna, first, a UWB monopole antenna is designed by carefully cutting out beveling slot from the sides of a rectangular monopole antenna. This technique enhances the impedance bandwidth of the antenna and helps in achieving multiband resonance characteristics. The antenna achieves a bandwidth of about 5.5 GHz with resonant modes at 5 GHz, 6 GHz, 7 GHz and 9 GHz respectively. This makes the antenna suitable for multiband wireless communication. The two port MIMO antenna is then designed by cascading the monopole antenna on a planar FR4 dielectric substrate of dimension 34 × 72 mm2. Each of the elements of the MIMO is feed separately by a 50 Ω microstrip feedline. Also, this thesis presents a detailed analysis of the effects of the bevel slots, dimensions of the antenna, and separation distance between the elements of the MIMO antenna on the performance of the proposed UWB monopole antenna and the MIMO antenna as well. The results are simulated with the help of the three-dimensional (3D) high frequency structure simulator (HFSS) software. The simulation results shows that the antenna is suitable for multiband UWB-MIMO wireless application.
|소형 다중대역 UWB-MIMO 안테나의 설계 및 분석
Martins Chidozie Ezuma
지도교수: 변재영교수, Ph. D.
조선대학교 대학원 정보통신공학과
초 광대역 무선 통신 기술(Ultra-wide band (UWB) communication technology)은 근거리 데이터 집약 무선통신기술의 가장 효율적인 대안 기술로 각광받고 있다. 이는 미국연방통신위원회(FCC)에서 UWB통신을 위한 방대한 무허가 대역폭을 배정하였기 때문이다. 또한 UWB 기술은 다중매체 영상 스트리밍과 같은 초고속 통신에 적합하다. 더욱이, 사물간 인터넷 (Internet of Things, IoT) 시대가 도래함에 따라 UWB통신은 실내 위치 기반 시스템, 홈 네트워킹 시스템, 그리고 의료시스템을 위한 인체통신 등에서 또다시 주목을 받고 있다. 기기 제작자들은 이러한 적용가능성을 기반으로 휴대하기 쉽고 초고속 통신에 접속이 가능한 장치의 제작에 관심을 보이고 있다.
- Alternative Title
- 소형 다중대역 UWB-MIMO 안테나의 설계 및 분석
- Alternative Author(s)
- 마틴스 치도지 이즈마
- Department
- 일반대학원 정보통신공학과
- Advisor
- Jae-Young Pyun
- Awarded Date
- 2015-08
- Table Of Contents
- Table of Contents
Table of Contents i
List of Figures iii
List of Tables iv
Acronyms v
Abstract (English) vi
Abstract (Korean) viii
1. Introduction 1
1.1 Background 3
1.2 Objectives 3
1.3 Thesis contribution 4
1.4 Thesis organization
2. The UWB Antenna Technology 6
2.1 Over view of the UWB Communication 6
2.1.1 Brief historical development of UWB 6
2.1.2 UWB definition and Spectral Waveform ………………………9
2.1.3 UWB regulations and Spectral Masking……………………….15
2.1.4 Advantages and Disadvantages of UWB Technology…………21
2.1.5 Application of UWB technology………………………….......23
2.1.6 The UWB Channel Model: Saleh-Valenzuela Model ………...24
2.1.7 UWB Main Modulation Techniques…………………………...27
2.2 The UWB Antenna…………………………………………………………..30
2.2.1 History of UWB Antennas………………………………...…30
2.2.2 State of the art……………………………………………… …31
2.3 Modelling the UWB antenna: ……………….…………….………………...36
2.3.1 Brief Overview……………………………….………… ……..36
2.3.2 Equivalent circuit Model of the UWB antenna………………...37
2.4 UWB Antenna Design Requirements…………………………………….…. 40
3. UWB-MIMO antenna system………………………………………………..……....42
3.1 Multi Antenna Systems………………………………………………..…....42
3.2 MIMO Diversity…………………………………………………..….……..43
3.3 MIMO Channel Model………………………………………………………44
3.4 Benefits of MIMO for UWB communication………………………..……..45
3.5 State-of-Art of UWB-MIMO antenna Design………………………..……..48
3.6 Challenges in designing UWB-MIMO antenna systems……………...….…49
4. The proposed UWB Monopole Antenna……………………………………….…….51
4.1 Overview…………………………………………………………………….51
4.2 The Antenna Geometry……………………………………………...……...51
4.3 Result and Discussion…………………………………………………....….54
4.3.1 Antenna Bandwidth……………………………………….…. .54
4.3.2 Radiation Pattern………………………………………………55
4.3.3 The smith chart………………………………………………...57
4.3.4 The surface current………………………………………….....59
4.3.5 Parametric Analysis…………………………………………....59
5. The proposed UWB-MIMO Antenna…………………………………………….......64
5.1 The UWB-MIMO Antenna Design…………………..………………….…. 64
5.2 Mutual coupling in the proposed UWB-MIMO…………………………......65
5.3 Envelop correlation and Diversity Performance………………………….....66
6. Conclusion……………………………………………………………………….……70
List of Publications……………………………………………………….……………………71
References………………………………………………………………………………...…...72
Acknowledgment……………………………………………………………….……………..80
List of Figures
Figure 1: Hertz experiment ……………………………………………………………………6
Figure 2: The UWB spectrum………………………………………………………………....8
Figure 3: The UWB Fractional Bandwidth……………………………………………….…..10
Figure 4: UWB waveform in time domain and frequency domain ………………………….10
Figure 5: Comparison of the time- and frequency domain of narrowband and UWB ……….11
Figure 6: The Gaussian pulse…………………………………………………………………12
Figure 7: Plots of the 1D Gaussian derivative function for order 0 to 7……………………...13
Figure 8: Waveform and PSD of Scholtz monocycle………………………………………...14
Figure 9: FCC’s emission limit masks for indoor and outdoor UWB applications………......16
Figure 10: EU spectral mask for UWB indoor applications……………………………….....18
Figure 11: The Japanese UWB emission mask…………………………………………….…19
Figure 12: The Proposed spectral mask in Asia …………………………………………..…20
Figure 13: WiMedia regulatory chart…………………………………………………..…….21
Figure 14: An illustration of channel impulse response……………………………………....26
Figure 15: Diagram of the band group allocation over the 3.1 – 10.6 GHz band….................28
Figure 16: The specification of each OFDM symbol in UWB MB-OFDM……………….....29
Figure 17: Radiation power factor of small antenna……………………………………….....34
Figure 18: Monopole antennas………………………………………………………….….....35
Figure 19: Equivalent circuit schematic of the UWB Antenna system……………………....38
Figure 20: General MIMO system……………………………………………………..….…45
Figure 21: 2×2 MIMO channel model……………………………………………….……....46
Figure 22: The geometry of the proposed UWB antenna……………………………...…….52
Figure 23: The antenna modeler designed in HFSS………………………..………..….......52
Figure 24: The reflection coefficient of the proposed UWB monopole…………...………..54
Figure 25 (a-d): The 3D radiation patterns at 5 GHz, 6 GHz, 7 GHZ and 9 GHz…….........55-57
Figure 26: The normalized smith chart of the proposed antenna……………………...........58
Figure 27: The surface current distribution for the proposed UWB monopole antenna........60
Figure 28 (a-d): Parametric sweep analysis…………………………………………….…..61-62
Figure 29: The proposed UWB-MIMO antenna…………………………………...………..64
Figure 30: Parametric analysis of the mutual coupling in the UWB-MIMO…………….….65
Figure 31: The Envelop correlation coefficient at different separation distance………….…67
Figure 32: Diversity gain against envelop correlation coefficient……………………….….68
Figure 33: Diversity gain against distance between the two monopoles…………………….69
- Degree
- Master
- Publisher
- 조선대학교
- Citation
- Martins Chidozie Ezuma. (2015). Design and Analysis of a Compact Multi-band UWB-MIMO Antenna.
- Type
- Dissertation
- URI
- https://oak.chosun.ac.kr/handle/2020.oak/12460
http://chosun.dcollection.net/common/orgView/200000264934
- Appears in Collections:
- General Graduate School > 3. Theses(Master)
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