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Title: Micromechanically Tunble Microwave Resonators based on Strip Lines
Other Titles: Micromechanisch afgestemde microgolfresonatoren gebaseerd op striplijnen
Authors: Serhiienko, Pavlo; R0361974
Issue Date: 10-Feb-2015
Abstract: This Ph.D. thesis is devoted to the investigation of the influence of geometrical and electro physical parameters of tunable microstrip resonators on their resonant frequency, quality factor, and coupling coefficient between resonator and microstrip line.
A method is proposed based on effective permittivity, characteristic impedance and loss of themicrostrip line with tunable air heterogeneity. The scattering matrix is derived from finite element models. A verification of the method is performed through experiments. The influence of the physical and topological parameters of the microstrip line with air heterogeneity on its equivalent parameters is analyzed.
Micromechanically tunable microstrip resonance elements are developed and experimentally investigated. Models of the microstrip resonance elements which simplify the calculation of the characteristics are created. The influence of air heterogeneity geometrical and electrophysical resonator parameters and external factorson resonance frequency, unloaded quality actor and coupling coefficientof a tunable microstrip stub and ring resonators is analyzed.Resonatorsbased on microstrip lines with tunable air heterogeneity provide smoothtuning in a wide frequency range without unloaded quality factor deterioration. This provides the opportunity to reduce the cost, weight and size of this type of devices while working in different frequency ranges.
Table of Contents: Preface 5
Abstract 6
Abbreviations 8
List of Symbols 9
Tunable microstrip resonators 11
1.1 Main types of the strip resonators 11
1.1.1 Resonators based on microstrip lines 12
1.1.2 Resonators based on coplanar lines 15
1.1.3 Resonators based on slot lines 17
1.2 Tunable microwave resonators classification 19
1.2.1 Different types microwave resonance elements features 20
1.2.2 Resonance frequency tuning methods features 31
Equivalent parameters of micromechanically tunable microstrip lines 37
2.1 Micromechanically tunable microstrip line 37
2.2 Electrodynamics problem solution for finding the basic equivalent parameters of the microstrip resonators 40
2.3 Identification of the MSL equivalent parameters with air heterogeneity 50
2.4 The characteristic impedance and effective dielectric constant 53
2.5 Losses at micromechanically tunable MSL 55
2.5.1 Losses in the substrate dielectric 62
2.5.2 Metal losses 64
Micromechanically tunable microstrip resonators 66
3.1 Stub resonators equivalent circuits 67
3.2 Effect of stub resonators physical and topological parameters into their characteristics 75
3.3 Experimental setup and measurements results 79
3.4 Stub resonator resonance frequency sensitivity to its parameters variation 82
3.5 Microstrip stub resonator resonance frequency measurement error 87
3.6 Stub resonators physical and topological parameters effect on their energy characteristics 90
3.7 Resonance frequency thermal stabilization of the tunable resonators based on MSL 95
3.8 Tunable stub resonators other proposed structures 97
3.8.1 Tunable resonator based on coplanar line 97
3.8.2 Tunable stub resonator parallel to the excitatory lines 99
Micromechanically tunable microstrip ring resonator 101
4.1 Tunable ring resonator structure 102
4.2 Ring resonator physical and topological parameters effect on its frequency characteristics 106
4.3 Ring resonator physical and topological parameters effect on its energy characteristics 111
Conclusion 117
MSL equivalent parameters 124
Bibliography 127
List of publications 136
Publication status: published
KU Leuven publication type: TH
Appears in Collections:ESAT- TELEMIC, Telecommunications and Microwaves

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