高增益低旁瓣新型集成介质天线研究
发布时间：2021-08-27 01:58
1929年被首次提出的“多棒”的介质棒天线（DRA）是“表面波”天线的一种。作为一种电大尺寸的行波天线,DRA通常在很宽的带宽上具有较高的增益、较高的辐射效率以及较好的极化纯度,可应用于诸如地面穿透雷达等领域。传统的介质棒天线主要存在两个缺点:天线较长;天线副瓣较高。研究能够以较短的长度实现高增益,并能将旁瓣电平控制在可接受范围内的介质棒天线仍然极具挑战。本文研究了一种新型介质棒天线,该天线具有高增益及低旁瓣电平特性,并且可实现线极化和圆极化两种极化方式。首先,本文提出了由线极化的八木天线和介质棒组成的集成天线形式。该天线由印刷八木天线、锥形介质壳和周期性介质棒组成,介质棒采用低损耗的特氟龙材料制作。八木天线嵌入锥形介质棒内,以提高定向增益、辐射效率并压低旁瓣电平;同时,具有三角形周期表面的介质棒被加载到电介质壳的末端,以获得更高的增益和更好的前后比;此外,文中也讨论了电介质覆盖层对整体结构辐射性能的影响。最后,设计了一个工作在8.5GHz～9.7 GHz的集成天线,其最大增益为18 dBi,旁瓣电平为-23.37 dB。实验测量结果与模拟结果吻合良好。与传统的八木天线和长度相同的介质...
【文章来源】：中国科学技术大学安徽省 211工程院校 985工程院校
【文章页数】：115 页
【学位级别】：博士
【文章目录】：
ABSTRACT
摘要
CHAPTER 1 INTRODUCTION
1.1 Introduction
1.2 Dielectric rod antennas
1.3 Current Situation of the Project
1.4 Organization of the Dissertation
CHAPTER 2 THEORY OFDIELECTRIC ROD ANTENNA
2.1 Introduction
2.2 Working Principle
2.3 Mechanism of Radiation Patterns
2.4 The Purpose of the Tapering Structure
2.5 Maximum Gain Point
2.5.1 Electric Field Distribution along the Dielectric Rod
2.5.2 Hassan-Wood Yard Condition for Flat Field Distribution
2.5.3 Design for 100% Excitation Efficiency
2.5.4 Ehrenspeck and Pohler: Yagi- Udawithout Feed Tapered
2.6 The Practical Design
2.7 The Feeding Structure of the Rod
2.8 Measurements
2.9 Results and Discussion
2.10 Gain Enhancement of Microstrip Antennas
2.11 Short Backfire Antenna
2.12 Microstrip Antennas withDielectric Cover
2.13 Microstrip Antennas Gain Improvement with T-lines Analogy
2.14 Gain Enhancement of Microstrip Patch Antennas
2.15 Chapter Summery
CHAPTER 3 A NOVEL INTEGRATED OF YAGI-UDA AND DIELECTRIC ROD ANTENNA WITH LOW SIDE LOBE LEVEL
3.1 Printed Yagi UdaAntenna
3.2 Theoretical Analysis of Integrated of Printed Yagi and Dielectric rod antenna
3.3 Influence of Dielectric Coveronthe EffectivePermittivity
3.4 Input Impedance of Typical Yagi Antenna
3.4.1 Reflection Coefficient and Return Loss of Typical Yagi Antenna
3.5 Simulated Return Loss of Printed Yagi with Dielectric Cover
3.6 Shift of resonance frequency with different substrate of Yagi
3.7 Radiation pattern of a typical Yagi antenna
3.8 Antenna Gain
3.8.1 Gain of Dipole Antenna
3.8.2 Gain of Printed Yagi antenna
3.9 Gain of Printed Yagi antenna with dielectric cover
3.10 Effect of the length of Yagi on directivity of the proposed structure
3.11 Radiation Pattern withTapered Dielectric Cover
3.12 Chapter Summery
CHAPTER 4 ANALYSIS OF PERIODIC SURFACE
4.1 Theory of Dielectric Rod Grating
4.2 Different Shapes of Periodic Surface
4.3 Effect of ratio h/t
4.4 Simulated Radiation pattern of whole structure
4.5 Chapter Summery
CHAPTER 5 DESIGN PARAMETERS AND SIMULATED RESULTS
5.1 Design Parameter of Printed Yagi
5.2 Simulated Return Loss and RadiationPatterns of Yagi with Reflector
5.3 Design parameters of dielectric cover with periodic surface of rod
5.4 Simulated return loss and radiation pattern of IYDRA
5.5 Performance Comparison of IYDRA with conventional SameLength dielectric rod antenna
5.5.1 Radiation pattern comparison of IYDRA and Yagi antenna
5.5.2 Radiation pattern comparison of same length IYDRA and Dielectric rod antenna
5.6 Fabrications steps
5.6.1 Fabrication and fixing of Yagi with its bottom disc reflector
5.6.2 Fabrication and fixing of whole structure of IYDRA
5.7 Measurement
5.7.1 Return loss measurement
5.7.2 Network Analyzer
5.7.3 Radiation pattern measurement
5.8 Chapter Summery
CHAPTER 6 DESIGN EXAMPLE FOR CIRCULAR POLARIZATION
6.0 Introduction
6.1 Helix Antenna
6.1.1 Axial Mode
6.2 Design Parameters for Circular polarization
6.3 Simulated Results for circular polarization
6.4 Comparison of Yagi and Helix feeding
6.4.1 Band width comparison with helix and Yagi feeding
6.4.2 Radiation patterns comparison with the helix and Yagi feeding
6.6 Chapter Summery
CHAPTER 7 A NOVEL EMBEDDED HELIX DIELECTRIC ROD ANTENNAFOR HIGH GAIN AND LOW SIDE LOBE LEVELS
7.1 Introduction
7.2 Theoretical Analysis
7.2.1 First Part
7.2.2 Second Part
7.2.3 Third Part
7.4 Fabrication and Measurement
7.5 Fabrication Steps
7.6 Chapter Summery
CHAPTER 8 CONCLUSION AND FUTURE PROSPECTIVE
8.1 Conclusion
8.2 Future Perspective
REFERENCES
LIST OF PUBLICATIONS
ACKNOWLEDGEMENTS
本文编号：3365418
【文章来源】：中国科学技术大学安徽省 211工程院校 985工程院校
【文章页数】：115 页
【学位级别】：博士
【文章目录】：
ABSTRACT
摘要
CHAPTER 1 INTRODUCTION
1.1 Introduction
1.2 Dielectric rod antennas
1.3 Current Situation of the Project
1.4 Organization of the Dissertation
CHAPTER 2 THEORY OFDIELECTRIC ROD ANTENNA
2.1 Introduction
2.2 Working Principle
2.3 Mechanism of Radiation Patterns
2.4 The Purpose of the Tapering Structure
2.5 Maximum Gain Point
2.5.1 Electric Field Distribution along the Dielectric Rod
2.5.2 Hassan-Wood Yard Condition for Flat Field Distribution
2.5.3 Design for 100% Excitation Efficiency
2.5.4 Ehrenspeck and Pohler: Yagi- Udawithout Feed Tapered
2.6 The Practical Design
2.7 The Feeding Structure of the Rod
2.8 Measurements
2.9 Results and Discussion
2.10 Gain Enhancement of Microstrip Antennas
2.11 Short Backfire Antenna
2.12 Microstrip Antennas withDielectric Cover
2.13 Microstrip Antennas Gain Improvement with T-lines Analogy
2.14 Gain Enhancement of Microstrip Patch Antennas
2.15 Chapter Summery
CHAPTER 3 A NOVEL INTEGRATED OF YAGI-UDA AND DIELECTRIC ROD ANTENNA WITH LOW SIDE LOBE LEVEL
3.1 Printed Yagi UdaAntenna
3.2 Theoretical Analysis of Integrated of Printed Yagi and Dielectric rod antenna
3.3 Influence of Dielectric Coveronthe EffectivePermittivity
3.4 Input Impedance of Typical Yagi Antenna
3.4.1 Reflection Coefficient and Return Loss of Typical Yagi Antenna
3.5 Simulated Return Loss of Printed Yagi with Dielectric Cover
3.6 Shift of resonance frequency with different substrate of Yagi
3.7 Radiation pattern of a typical Yagi antenna
3.8 Antenna Gain
3.8.1 Gain of Dipole Antenna
3.8.2 Gain of Printed Yagi antenna
3.9 Gain of Printed Yagi antenna with dielectric cover
3.10 Effect of the length of Yagi on directivity of the proposed structure
3.11 Radiation Pattern withTapered Dielectric Cover
3.12 Chapter Summery
CHAPTER 4 ANALYSIS OF PERIODIC SURFACE
4.1 Theory of Dielectric Rod Grating
4.2 Different Shapes of Periodic Surface
4.3 Effect of ratio h/t
4.4 Simulated Radiation pattern of whole structure
4.5 Chapter Summery
CHAPTER 5 DESIGN PARAMETERS AND SIMULATED RESULTS
5.1 Design Parameter of Printed Yagi
5.2 Simulated Return Loss and RadiationPatterns of Yagi with Reflector
5.3 Design parameters of dielectric cover with periodic surface of rod
5.4 Simulated return loss and radiation pattern of IYDRA
5.5 Performance Comparison of IYDRA with conventional SameLength dielectric rod antenna
5.5.1 Radiation pattern comparison of IYDRA and Yagi antenna
5.5.2 Radiation pattern comparison of same length IYDRA and Dielectric rod antenna
5.6 Fabrications steps
5.6.1 Fabrication and fixing of Yagi with its bottom disc reflector
5.6.2 Fabrication and fixing of whole structure of IYDRA
5.7 Measurement
5.7.1 Return loss measurement
5.7.2 Network Analyzer
5.7.3 Radiation pattern measurement
5.8 Chapter Summery
CHAPTER 6 DESIGN EXAMPLE FOR CIRCULAR POLARIZATION
6.0 Introduction
6.1 Helix Antenna
6.1.1 Axial Mode
6.2 Design Parameters for Circular polarization
6.3 Simulated Results for circular polarization
6.4 Comparison of Yagi and Helix feeding
6.4.1 Band width comparison with helix and Yagi feeding
6.4.2 Radiation patterns comparison with the helix and Yagi feeding
6.6 Chapter Summery
CHAPTER 7 A NOVEL EMBEDDED HELIX DIELECTRIC ROD ANTENNAFOR HIGH GAIN AND LOW SIDE LOBE LEVELS
7.1 Introduction
7.2 Theoretical Analysis
7.2.1 First Part
7.2.2 Second Part
7.2.3 Third Part
7.4 Fabrication and Measurement
7.5 Fabrication Steps
7.6 Chapter Summery
CHAPTER 8 CONCLUSION AND FUTURE PROSPECTIVE
8.1 Conclusion
8.2 Future Perspective
REFERENCES
LIST OF PUBLICATIONS
ACKNOWLEDGEMENTS
本文编号：3365418
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