 | Culhaoglu A.E. Microwave metamaterials: superlensing and design of low reflection coatings: Diss. … Dr. rer. nat. / Deutsches Zentrum für Luft- und Raumfahrt, Institut für Hochfrequenztechnik und Radarsysteme, Oberpfaffenhofen. - Köln: DLR, Bibliotheks- und Informationswesen, 2012. - x, 114 p.: ill. - (Forschungsbericht; 2012-11). - Ref.: p.103-113. - ISSN 1434-8454
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1 Introduction ................................................. 1
1.1 Motivation and Objectives ............................... 2
1.2 Contributions of the Thesis ............................. 3
1.3 Thesis Outline .......................................... 4
2 Concept of Metamaterials ..................................... 7
2.1 General Definition ...................................... 7
2.2 Artificial Electromagnetic Materials .................... 7
2.3 Classification ......................................... 10
2.4 Wave Propagation ....................................... 12
2.5 Transmission Line Modeling ............................. 13
2.5.1 Right-Handed Transmission Line .................. 14
2.5.2 Left-Handed Transmission Line ................... 15
2.5.3 Composite Right-Left-Handed Transmission Line ... 16
2.6 Drude and Lorentz Dispersion ........................... 19
2.7 Realization ............................................ 22
2.8 Applications ........................................... 25
2.9 Homogenization Methods ................................. 27
2.10 Effective Parameter Extraction ......................... 28
2.10.1 Strip-SRR Metamaterials ......................... 29
2.10.2 CLS-SRR Metamaterials ........................... 32
3 Metamaterial Superlens ...................................... 35
3.1 Physical Background .................................... 36
3.2 Analytical Formulation ................................. 37
3.3 Analytical Properties .................................. 40
3.4 Ideal Imaging .......................................... 42
3.5 Non-Ideal Imaging ...................................... 43
3.6 Results ................................................ 44
3.6.1 Small Amount of Absorption ...................... 45
3.6.2 Unit Refractive Index ........................... 49
3.6.3 Non-Unity Refractive Index ...................... 51
3.6.4 Thickness of the Slab ........................... 55
3.6.5 Aperture Size ................................... 56
3.6.6 Excitation by Broadband Pulses .................. 57
4 Metamaterial Microwave Absorbers ............................ 61
4.1 Drude and Lorentz Dispersive Microwave Absorbers ....... 62
4.1.1 Principles of Operation ......................... 62
4.1.2 Realization ..................................... 64
4.2 Metamaterial Low Reflection Coatings ................... 68
4.2.1 Principles of Operation ......................... 68
4.2.2 Equivalent Circuit Model ........................ 69
4.2.3 Design Example .................................. 71
4.2.4 Optimization and Tuning ......................... 72
4.2.5 Angle of Incidence and Polarization
Dependence ...................................... 75
4.2.6 Realization ..................................... 77
4.2.7 Radar Cross Section Reduction ................... 78
4.2.8 Modeling with Impedance Boundaries .............. 81
5 Results and Conclusion ...................................... 83
A Reflection and Transmission through Layered Media ........... 87
A.1 Semi-infinite Media .................................... 87
A.2 Layered Media ........................................... 89
В Radar Cross Section ......................................... 91
List of Figures ................................................ 95
List of Tables ................................................. 99
Abbreviations and Symbols ..................................... 101
References .................................................... 103
Curriculum Vitae .............................................. 114
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