發(fā)布時間：2022-02-17 22:14

　　無線通信技術的發(fā)展已經(jīng)對包括天線在內的集成器件提出了要求。天線是低剖面集成無線通信系統(tǒng)的重要組成部分。特別是片上天線,因為需要體積小的天線來完成現(xiàn)代手持無線通信設備的優(yōu)化設計,是天線研究的一個重要領域。多頻段運行和更寬的工作帶寬是這些無線設備的另一要求。實現(xiàn)這些特性的解決方案之一是引入分形幾何。分形幾何具有固有的自相似性或自仿射性,用來描述和模擬自然界中的各種形狀,如山脈、波浪等。這一特性有助于研究人員和天線設計者挖掘出一些適合設計小天線的新幾何圖形。將分形幾何引入微帶天線是一個新興的研究領域,需要對其進行評估以獲得最佳的天線響應。分形幾何天線的使用傾向于小型化、擴大工作帶寬、產生多頻帶響應等方面。雖然近年來微帶貼片天線在尺寸縮小、多頻帶響應和帶寬增強等方面已提出不少技術并應用于通信和雷達系統(tǒng),但是為滿足緊湊、高效和低成本天線的挑戰(zhàn),仍有很大的進一步研究的空間。本文提出了兩種新的分形貼片天線設計方案。第一個方案,我們基于科赫和閔可夫斯基的組合（K-M）分形幾何設計了一種新型混合分形天線。運行在1.8 GHz的微帶貼片天線（MPA）結合了新穎的K-M混合分形幾何,這導致工作頻率降至1.4... 

【文章來源】：重慶大學重慶市211工程院校985工程院校教育部直屬院校

【文章頁數(shù)】：99 頁

【學位級別】：博士

【文章目錄】：
中文摘要
ABSTRACT
GLOSSARY
1 INTRODUCTION
    1.1 Literature Review
    1.2 Motivation
    1.3 Problem Statement
    1.4 Research Methodology
    1.5 Thesis Organization and Contribution
2 ANTENNA THEORY
    2.1 Introduction to Antennas
    2.2 Brief Overview
    2.3 Antenna background
    2.4 Antenna Parameters
    2.5 Microstrip Antennas
    2.6 Introduction of Microstrip Patch Antenna (MPA)
    2.7 Basic principles of MPA Operation
    2.8 Types of Microstrip Patch Antennas
    2.9 Feeding techniques of Microstrip Patch Antenna
        2.9.1 Coaxial Probe Feed
        2.9.2 Microstrip line feed
        2.9.3 Aperture coupled feed
        2.9.4 Proximity Coupled Feed
        2.9.5 Comparison of feeding techniques
    2.10 Radiation fields
    2.11 Advantages and Disadvantages
    2.12 Summary
3 FRACTAL ANTENNAS
    3.1 Introduction
    3.2 Fractals
    3.3 Fractal Antenna
    3.4 Iterated Function Systems
    3.5 Fractal Geometries
        3.5.1 Sierpinski Gasket
        3.5.2 Koch Curve
        3.5.3 Minkowski Curve
        3.5.4 Cohen- Minkowski Geometry
    3.6 Summary
4 PROPOSED NOVEL MINIATURIZED KOCH-MINKOWSKI HYBRID FRACTAL ANTENNA
    4.1 Proposal of K-M Hybrid geometry
    4.2 Antenna Design for GSM Application
        4.2.1 Design of MPA for GSM Application
    4.3 Design of Novel Fractal Antenna
        4.3.1 Hybrid Fractal Geometry
        4.3.2 K-M Hybrid Fractal Patch Antenna Design
    4.4 Comparison of Proposed Hybrid Fractal Geometry with Koch geometry
    4.5 Fabrication of the Antenna
    4.6 Testing Results
        4.6.1 Vector Network Analyzer (VNA) Testing
        4.6.2 Anechoic Chamber Testing
    4.7 Summary
5 PROPOSED NOVEL STAIR SHAPED FRACTAL ANTENNA FOR MULTIBAND OPERATIONS
    5.1 Proposal of Stair Shaped Fractal geometry
    5.2 MPA Design
    5.3 Design of Novel Fractal Antenna
        5.3.1 Stair Shaped Fractal Geometry
        5.3.2 Stair Shaped Fractal Antenna Design
    5.4 Fabrication of the Antenna
    5.5 Testing Results
        5.5.1 Vector Network Analyzer (VNA) Testing
        5.5.2 Anechoic Chamber Testing
    5.6 Summary
6 CONCLUSION AND FUTUREWORK
ACKNOWLEDGEMENT
REFERENCES
Appendix
    A. Publication during the study for the degree



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