Thesis or Dissertation Novel Compact High-Temperature Superconductor Multi-Band Bandpass Filters

劉, 海文

Description
主指導教員 : 馬哲旺
1 Introduction............................................................................................................11.1 MOTIVATION .....................................................................................................11.2 BACKGROUND...................................................................................................31.3 THESIS OVERVIEW AND CONTRIBUTIONS...............................................111.4 GLOSSARY OF TERMS....................................................................................14REFERENCE...............................................................................................................142 Basic Concepts and Theories of HTS Filter and Process....................................162.1 OVERVIEW........................................................................................................162.2 HTS FILTER DESIGN........................................................................................172.3 HTS MATERIALS AND PROCESSING............................................................282.4 SUMMARY.........................................................................................................39REFERENCES.............................................................................................................393 Multi-Band HTS Filter Based on Split Ring Resonator (SRR) .....................413.1 OVERVIEW........................................................................................................413.2 SPLIT RING RESONATOR FOR FILTER DESIGN.........................................413.3 DUAL-BAND HTS FILTER WITH OCTAGONALSPLIT RING RESONATOR .............................................................................423.3.1 Filter Structure..........................................................................................423.3.2 Octagonal Split Ring Resonator................................................................433.3.3 Coupling Schemes....................................................................................463.3.4 Experimental Results and Discussion.......................................................473.4 TRIPLE-BAND HTS FILTER WITH STEP IMPEDANCE SPLIT RINGRING RESONATOR....................................................................................483.4.1 Stepped-impedance Resonators................................................................483.4.2 Stepped-impedance Split Ring Resonator.................................................503.4.3 Filter Configuration..................................................................................543.4.4 Fabrication and Measured Results............................................................553.5 DUAL-BAND HTS FILTER WITH MULTI-MODE SPLIT RINGRESONATOR....................................................................................................563.5.1 Dual-mode Split Ring Resonator..............................................................563.5.2 Multi-mode Split Ring Resonator.............................................................593.5.3 Filter Topology..........................................................................................603.5.4 Experimental Results................................................................................633.6 SUMMARY.........................................................................................................64REFERENCES.............................................................................................................644 Multi-Band HTS Filter Based on Stub-loaded Resonator (SLR) ....................664.1 OVERVIEW........................................................................................................664.2 CONVENTIONAL STUB-LOADED RESONATOR.........................................664.3 OPEN STUB LOADED MULTI-MODE RESONATOR...........................674.3.1 Analysis of the Resonator........................................................................674.3.2 Design of the Tri-Band HTS Passband Filter............................................714.3.3 Experiment and Discussion...............................................................744.4 SHORT CIRCUIT STUB LOADED MULTI-MODE RESONATOR…...754.4.1 Analysis of the Resonator.......................................................................764.4.2 Design of the Tri-Band HTS Passband Filter......................................804.4.2.1 Analysis of Transmission the Zeros..............................................844.4.2.2 Optimization Scheme....................................................................864.5 STEPPED IMPEDANCE STUB-LOADED RESONATOR......................884.5.1 Analysis of the Resonator........................................................................884.5.2 Design of the Quad-Band HTS Passband Filter...................................914.5.3 Experiment and Discussion...............................................................934.6 SUMMARY.........................................................................................................965 Multi-Band HTS Filter Based on Square Ring Loaded Resonator (SRLR)…985.1 OVERVIEW........................................................................................................985.2 BASIC STRUCTURE OF SQUARE RING LOADED RESONATOR (SRLR).995.2.1 Microstrip Line Structure..........................................................................995.2.2 Transmission Line Model.......................................................................1005.3 CHARACTERISTICS ANALYSIS OF QUADRUPLE-MODE SRLR............1015.3.1 Exploitation of Resonant Modes.............................................................1015.3.2 Even and Odd-mode Analysis.................................................................1025.3.3 Design Net-type Graphs and Demonstration..........................................1045.3.4 Generating Mechanism of Transmission Zeros.......................................1075.4 QUAD-BAND HTS MICROSTRIP BANDPASS FILTER...............................1085.4.1 SRLR Unit Design.................................................. ...............................1085.4.2 Design of the Second-order HTS Passband Filter...............................1125.4.3 Implementation of the HTS Passband Filter........................................1145.5 SUMMARY.......................................................................................................116REFERENCES...........................................................................................................1176 Conclusions and Recommendations for Future Work.....................................1196.1 OVERVIEW......................................................................................................1196.2 CHAPTER SUMMARIES................................................................................1196.2.1 Chapter 2.................................................................................................1196.2.2 Chapter 3.................................................................................................1196.2.3 Chapter 4.................................................................................................1206.2.4 Chapter 5.................................................................................................1216.3 FUTHUR WORKS............................................................................................121ACKNOWLEDGMENTS.......................................................................................123
With the increasing development of multi-service wireless communication network, microwave components and systems that support various modern communication standards have become a widespread tendency. Therefore, as a key passive component in the radio-frequency (RF) front-end, multi-band bandpass filter (BPF) design with compact size, high performance and low loss is in great demand for enhancing system functionality. Being an essential part of multi-band operation system, the multi-band BPF has achieved great attention in recent years. Basically, these reported multi-band design methods can be classified into three typical categories. The first approach is utilizing the multi-layered structure to achieve the multi-band response. However, the aforementioned multi-band BPFs require multiple types of resonators or multi-layered fabrication technology, which increase fabrication difficulty and cost. The second approach is to cascade two types of dual-band BPF in parallel, such as symmetric stepped impedance resonators (SIRs), and fork-type resonators. Each set of resonators produce two passbands and four passbands are therefore achieved by two sets of these resonators. But, the circuits always occupy a relatively large size. The third approach is adopting coupled multi-mode resonators for multi-band BPFs. Several resonant modes are excited in desired frequencies using one multi-mode resonator, thus, a compact filter configuration can be obtained. Nevertheless, their higher-order passbands are with a noticeable insertion loss of more than 1 dB. Recently, high-temperature superconducting (HTS) materials become more and more attractive in designing the RF/microwave filters because of their lower loss and excellent performance. Generally, the current study on HTS filter mainly focuses on the single passband filter, and only few attempts have so far been made on multi-band HTS BPF. For example, dual-/triple-band HTS filters were designed by using multi-spiral resonators. In addition, dual-band HTS filters have been realized by using quarter-wavelength SIRs, embedded split ring resonators, or multi-stub loaded resonators. It is noted that some complex synthesis algorithms are required and coupling matrix need to be extracted for achieving a good performance. So, they take more effort to fulfill design parameters. This dissertation is organized as follows. In Chapter 1, the background and motivation of this study are described. The current research status of HTS microwave filters is reviewed, and the composition of this dissertation is explained. In Chapter 2, the basic principles of microwave HTS filter design are given. This chapter also introduces HTS materials and processing. Basic concepts and theories of filters in this chapter provide an effective method for high-performance miniaturized multi-band HTS microwave bandpass filter design. In this research, HTS thin film YBCO deposited on a 0.5-mm-thick MgO substrate is utilized to fabricate the circuit.. In Chapter 3, multi-band HTS filters based on split ring resonator (SRR) are discussed. A compact triple-band HTS YBa2Cu3Oy microstrip BPF using multimode split ring resonator (SRR) is presented. Also, its properties and equivalent circuit models are investigated by even- and odd-mode analysis. Furthermore, a dual-band superconducting metamaterial structure with improved performance based on the proposed multimode SRR is introduced in this chapter, which is constructed by two dual-mode SRRs and a high-impedance transmission line component. In Chapter 4, multi-band HTS filters based on stub-loaded resonator (SLR) are proposed. A multiple mode resonators with loaded open stubs and short stubs are introduced and a compact triple-band HTS BPF using multimode stub-loaded resonator is proposed. To sharpen the passband skirts, a source-load coupling configuration with a non-resonant node is arranged to produce several extra transmission zeros for realizing high-selectivity performances. Moreover, a simple sextuple-mode resonator loaded by open- and short-end stubs is proposed. Multi-band filter design theory using the proposed resonator is explained and the desired passbands can be conveniently allocated by properly choosing the dimension parameters of the stub-loaded resonator. To sharpen the passband skirts of the filter, a source-load coupling configuration with interdigital structure is arranged to produce several transmission zeros. Then, multipath coupling diagrams are constructed and the relative phase shifts of each path are studied to explain the responses of the triple-band filter. A grounding technique of the short-end stub is realized by subtly connecting with the metal wall packaging instead of via-holes in the substrate. In consideration of the inaccuracy in HTS fabricating and packaging, an optimization scheme is proposed. In Chapter 5, multi-band HTS filters based on square ring loaded resonator (SRLR) are designed. A compact dual-/ quad-band HTS BPF using quadruple-mode square ring loaded resonator (SRLR) are introduced. The even- and odd-mode method is applied to investigate the equivalent circuits of the proposed quadruple-mode SRLR so that the design graphs for the relationship of the electrical length parameters and the resonance performances are set up. Meanwhile, multi-transmission zeros are created due to the different propagation paths of the square ring structure. Also, signal-interference theory is adopted to explain the generating mechanism of transmission zeros. This chapter mainly introduces the design and method of the quad-band filter. The quadruple-mode SRLRs are coupled with a pseudo-interdigital coupling structure for achieving the desired coupling degree conveniently, which also miniaturize the circuit size. In Chapter 6, conclusions of this dissertation and recommendations for future work are discussed. The main objective of this dissertation is to address the challenging issues of advanced microwave dual-band, tri-band, and multi-band compact HTS filter design in the context of wireless communication systems.
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