Title Page
Abstract
국문 요약서
Contents
Chapter 1. Introduction 17
Chapter 2. Asymmetric-Response Post-Loaded Substrate-Integrated Waveguide Filter 20
2.1. Introduction 20
2.2. Coupling matrix synthesis 23
2.3. Practical design 36
2.3.1. Resonator 36
2.3.2. Coupling structures 37
2.3.3. Filter design 44
2.4. Measurement and discussion 49
2.5. Application 54
2.6. Conclusion 58
Chapter 3. Accurate Synthesis of Input-Reflectionless Dual-Passband Filter 59
3.1. Introduction 59
3.2. Synthesis 62
3.2.1. Filtering section 62
3.2.2. Matching section 66
3.2.3. Examples 70
3.3. Filter Design and Measurement 73
3.3.1. Design 73
3.3.2. Fabrication and Measurement 77
3.4. Application 79
3.4.1. Higher-Order Filter Synthesis 79
3.4.2. Asymmetric response 89
3.4.3. Equi-ripple Filter Synthesis 90
3.5. Conclusion 96
Chapter 4. Electroformed Dual-Mode Waveguide Filter With No Tuning Screws 97
4.1. Introduction 97
4.2. Filter Design 99
4.3. Fabrication and Measurement 107
4.4. Conclusion 110
Chapter 5. Conclusions 111
References 113
Table 2.1. Comparison with other works on frequency-dependent couplings 53
Table 3.1. Coupling values for predefined responses in Fig. 3.5 71
Table 3.2. Coupling values for predefined responses in Fig. 3.9 83
Table 3.3. Coupling values for predefined responses in Fig. 3.11 88
Table 3.4. Coupling values for predefined responses in Fig. 3.14 94
Table 4.1. Comparison with other works on waveguide cavity filters 109
Figure 2.1. (a) Coupling diagram of a fourth-order filter with a cross coupling between resonators 1 and 4. (b) Frequency response corresponding to (2.4) (solid lines) and the... 24
Figure 2.2. Asymmetric frequency response corresponding to (2.6). 27
Figure 2.3. Asymmetric frequency response corresponding to (2.7). 29
Figure 2.4. Asymmetric frequency response corresponding to (2.8). 31
Figure 2.5. Asymmetric frequency response corresponding to (2.9). 31
Figure 2.6. Cross-sectional view and the layer-by-layer view of the resonator. 37
Figure 2.7. (a) Resonator with external coupling. (b) Iris between two resonators. 38
Figure 2.8. Interresonator coupling with an S-shaped conductive strip. 39
Figure 2.9. Simulated S₂₁ response for the positive coupling (dashed line) and the negative coupling (solid line). 40
Figure 2.10. Design graphs for (2.7). (U₁₄ variation with respect to the iris width and the arc angle) 43
Figure 2.11. Design graphs for (2.13). (U₁₄ variation with respect to the iris width and the arc angle) 43
Figure 2.12. Physical dimensions. (a) Filter corresponding to (2.4). (b) Filter corresponding to (2.7). (c) Filter corresponding to (2.13). 45
Figure 2.13. Layer-by-layer view of proposed structure. 46
Figure 2.14. Solid lines and dotted lines show simulated responses of filters corresponding to (2.4) and (2.7), respectively. 48
Figure 2.15. Solid lines and dotted lines show simulated responses of filters corresponding to (2.4) and (2.13), respectively. 48
Figure 2.16. Photograph of the fabricated filter. 49
Figure 2.17. Frequency responses of filter corresponding to (2.4). 50
Figure 2.18. Frequency responses of filter corresponding to (2.7). 51
Figure 2.19. Frequency responses of filter corresponding to (2.13). 51
Figure 2.20. Frequency response of filter corresponding to (2.7) (dotted lines) and the one of filter when the transmission zero at wz3 is closer to the passband (solid lines).[이미지참조] 54
Figure 2.21. Frequency response of filter corresponding to (2.16). 55
Figure 2.22. Frequency response of filter corresponding to (2.17). 57
Figure 3.1. Normalized second-order Butterworth response. (a) Lowpass response. (b) Dual-passband response. 63
Figure 3.2. Schematic of an input-reflectionless filter with the filtering and matching sections. 65
Figure 3.3. Coupling routing diagram of matching section. (5-8: resonators, A: non-resonating node, R: resistive node) 69
Figure 3.4. Coupling routing diagram of input-reflectionless dual-passband filter with 8 resonators. 69
Figure 3.5. Frequency responses with different Ωₘ's. (a) Ωₘ=0.3. (b) Ωₘ=0.5. (c) Ωₘ=0.7. 72
Figure 3.6. (a) Perspective view of the filter structure. (b) Top view of the filter structure. (l₁=9.6, l₂=l₃=10, l₄=9.3, l₅=8.5, l₆=l₈=9.9, l₇=9, d₁=d₂=14.3.) (All... 74
Figure 3.7. Photograph of the fabricated filter. 77
Figure 3.8. Frequency responses of the filter in Fig. 3.7. (a) transmission response. (b) reflection response. 78
Figure 3.9. Frequency responses with different Ωₘ's. (a) Ωₘ=0.3. (b) Ωₘ=0.5. (c) Ωₘ=0.7. 81
Figure 3.10. Coupling routing diagram of input-reflectionless dual-passband filter with 16 resonators. 81
Figure 3.11. Frequency responses with different Ωₘ's. (a) Ωₘ=0.3. (b) Ωₘ=0.5. (c) Ωₘ=0.7. 86
Figure 3.12. Coupling routing diagram of input-reflectionless dual-passband filter with 24 resonators. 86
Figure 3.13. Asymmetric input-reflectionless frequency responses. (a) Response with the first passband wider than the second one. (b) Response with the second passband wider... 90
Figure 3.14. Frequency responses with different Ωₘ's. (a) Ωₘ=0.3. (b) Ωₘ=0.5. (c) Ωₘ=0.7. 93
Figure 3.15. Coupling routing diagram of matching section for an equi-ripple response. 94
Figure 4.1. Coupling routing diagram of fourth-order dual-mode filter and its coupling matrix. 99
Figure 4.2. Frequency response with the coupling values: M₁₁=-0.712, M₂₂=1.058, M₃₃=0.763, M₄₄=-1.028, MS1=0.805, MS2=0.647, M1A=-0.716, M2A=0.415, MB3=...[이미지참조] 100
Figure 4.3. Perspective view of the filter structure (l₁=20.1, l₂=22.7, h₁=25.1, h₂=22.6, d₁=11.9, w₁=w₂=25.85.) (All dimensions in mm.) 101
Figure 4.4. Filter responses of (a) subcircuit A. (b) subcircuit B. 103
Figure 4.5. Frequency response of (a) dual-mode resonator filter. (b) Corrugated low passfilter. 104
Figure 4.6. Filter fabrication. (a) Mandrel. (b) Copper growing on mandrel. 107
Figure 4.7. Fabricated waveguide filter 108
Figure 4.8. Frequency responses. 108