This thesis is a report on an experimental study done on a new type of microwave device. This device is a monolithic, integrated circuit which uses “lumped” elements to approximate a distributed-parameter active RC line. The active region of this device are IMPATT diodes which are capable of generating negative conductance effects (through transit-time delays of majority carriers) at microwave frequencies. The combined effect of negative conductance and positive real resistance within the device makes it capable of being a microwave amplifier or oscillator. The advantage of this type of device is that it does not have to present a negative impedance to an external signal source (as is the case with parametric amplifiers) to accomplish gain. Due to the nature of its design, it is inherently more “broadbanded” than the parametric amplifier. Also, no external “pump” is needed since the device obtains gain by an entirely different principle. In the following pages a brief description of the basic operating theory of the device will be given. This description will show how the negative conductance effect is generated and how this is incorporated into the design of the final active network. Following this is a detailed discussion of experimental procedure, device characteristics sought, and the results obtained. The results of testing show that this device is capable of functioning as a microwave amplifier. They also show that more work will have to be done in improving the "packaging” of the device. Aside from these "packaging” problems, it appears that this device is the key to a new area of microwave semiconductor devices. / Master of Science

by Cheng Yat Man. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2000. / Includes bibliographical references (leaves 1-6 (2nd gp.)). / Abstracts in English and Chinese. / Acknowledgements / Abstract: / A CD containing the Simulator and Results / List of Figures / List of Tables / Chapter 1. --- Introduction / Introduction --- p.1 / Chapter 2 --- Background Theory / Chapter 2.1 --- Empirical Design Formulas for Some Passive Microwave structures --- p.2 / Chapter 2.2.1 --- Short Dipole and Monopole --- p.4 / Chapter 2.2.2 --- Slot Antenna --- p.6 / Chapter 2.2.3 --- Stripline --- p.8 / Chapter 2.2.4 --- Microstrip --- p.10 / Chapter 2.2 --- Edge Based Finite Element Method and the Generalized Variational Principle --- p.12 / Chapter 2.2.1 --- Vector Finite Element Method for Electromagnetics --- p.14 / Chapter 2.2.1.1 --- Variational Formulation --- p.14 / Chapter 2.2.1.2 --- Advantages in Total Field Formulation --- p.16 / Chapter 2.2.2 --- Formulation by Method of Weighted Residual the Galerkin's Approach --- p.17 / Chapter 2.2.3 --- "the Vector Bases for BRICK, PRISM, TETRA" --- p.21 / Chapter 2.2.3.1 --- BRICK --- p.23 / Chapter 2.2.3.2 --- PRISM --- p.26 / Chapter 2.2.4 --- "Domain Discretization: Mesh Generation Scheme for 3D, 2D, ID Geometrical Entities in the Cartesian Domain" --- p.29 / Chapter 2.3 --- Construction of the Functional with Total Field Formulation --- p.31 / Chapter 2.3.1 --- Vector Wave Equation in the Cartesian Domain --- p.32 / Chapter 2.3.2 --- Boundary Conditions in the Cartesian Domain --- p.33 / Chapter 2.3.2.1 --- Perfect Magnetic Wall (Neumann's Boundary Condition) --- p.34 / Chapter 2.3.2.2 --- Perfect Electric Wall (Dirichlet Boundary Condition) --- p.34 / Chapter 2.3.2.3 --- Anisotropic Perfectly Matched Layer (APML) --- p.35 / Chapter 2.3.2.4 --- 2nd Order Absorbing Boundary Conditions --- p.39 / Chapter 2.3.2.5 --- Plane Wave Incidence (Uinc) --- p.40 / Chapter 2.3.2.6 --- Magnetic Aperture (M) --- p.42 / Chapter 2.3.2.7 --- Passive Lumped Load (ZL1D ) --- p.42 / Chapter 2.3.2.8 --- Current Feed (J) --- p.42 / Chapter 2.3.2.9 --- Voltage Feed (impressed E-field) --- p.43 / Chapter 2.3.2.10 --- Resistive Sheet ( =lst order ABC = standard IBC ) --- p.44 / Chapter 2.4 --- Visualization and Post-Processing of the Solution Field --- p.45 / Chapter 2.4.1 --- Field Pattern Plot --- p.45 / Chapter 2.4.2 --- Impedance at Input Port --- p.45 / Chapter 2.4.3 --- Y-parameter Extraction. --- p.46 / Chapter 3. --- Simulation Results and Discussion; / Chapter 3.1 --- Radiating Structures --- p.48 / Chapter 3.1.1 --- Short Dipole and Monopole --- p.48 / Chapter 3.1.1.1 --- Short Dipole --- p.48 / Chapter 3.1.1.2 --- Equivalent Monopole --- p.50 / Chapter 3.1.2 --- Slot Antenna --- p.52 / Chapter 3.1.2.1 --- Slot Antenna excited by the equivalent magnetic aperture --- p.52 / Chapter 3.1.2.3 --- Slot Antenna Excited by Unit Current Feed with Plane Wave Incidence ( Uinc) --- p.54 / Chapter 3.2 --- Striplines --- p.57 / Chapter 3.2.1 --- A Straight 50Ω Stripline --- p.57 / Chapter 3.2.1.1 --- Optimizing the Thickness and Number of Layer of PML --- p.58 / Chapter 3.2.1.2 --- Different Combination of BRICK and PRISM Mesh --- p.60 / Chapter 3.2.2 --- A Cross Junction --- p.63 / Chapter 3.2.3 --- A Squared 90° Corner --- p.69 / Chapter 3.2.4 --- A Champfered 90° Corner --- p.73 / Chapter 3.2.5 --- A Pair of Slot-Coupled Stripline Each Terminated with Open Circuit at Slot + λ/2 --- p.75 / Chapter 3.2.6 --- A Pair of Slot-Coupled Stripline Each Terminated with Short Circuit at Slot + λ/4 --- p.78 / Chapter 3.2.7 --- A Pair of Slot-Coupled Striplines Each Terminated with Short Circuit at Slot + λ/4 and Shorted through the Slot --- p.80 / Chapter 3.2.8 --- A Pair of Slot-Coupled Striplines Each Terminated with Short Circuit at Slot + λ/4 and has 50Ω Load through the Slot --- p.83 / Chapter 3.3 --- Calculating the Input Impedance ( Vport / Iport ) / Chapter 3.3.1 --- A Pair of Slot-Coupled Stripline Each Terminated with Short Circuit at Slot + λ/4 --- p.85 / Chapter 4 --- Conclusion / Chapter 4.1 --- Conclusion --- p.88 / Chapter 4.2 --- Minor Problems Encountered --- p.89 / Chapter 4.2 --- To Probe Further --- p.90 / Chapter Appendex: --- Implementation of the Edge-Based Finite Element Method / Chapter A.1 --- Mesh Generation Scheme --- p.92 / Chapter A.1.1 --- "Global Node, Edge and Primitive Assignment" --- p.93 / Chapter A.1.2 --- Property Assignment Local to Every Basis and Primitive --- p.94 / Chapter A.2 --- Assembly the Global System of Equations from the Element Stamps of all Primitives wrt. Global Edge Numbering --- p.95 / Chapter A.2.1 --- Setting up the Volumetric Integral for the Vector Wave Equation --- p.95 / Chapter A.2.1.1 --- Volume Integration of Constant Tangential Brick Elements --- p.96 / Chapter A.2.1.2 --- Volume Integration of Constant Tangential Pyramidal Elements --- p.98 / Chapter A.2.2 --- Incorporation of Boundary Conditions --- p.100 / Chapter A.2.2.1 --- Surface Integration of Constant Tangential Brick Elements --- p.100 / Chapter A.2.2.2 --- Surface Integration of Constant Tangential Pyramidal Elements --- p.105 / Chapter A.3 --- Solution to the Final System --- p.110 / Chapter A.3.1 --- Solving a System of Linear Equations by Diagonalization & Blockwise Partitioning --- p.111 / Chapter A.3.2 --- Direct Solution Method for Complex-valued System --- p.114 / Chapter A.4 --- Visualization and Post-Processing of the Solution Field --- p.115 / Chapter A.4.1 --- Field Pattern Visualization --- p.115 / Chapter A.4.2 --- Input Impedance Definition ( Vport /Iport). --- p.115 / Chapter A.4.3 --- Y-parameter Extraction. --- p.115 / Chapter A.4.3.1 --- Surface Integration of Brick Elements --- p.115 / Chapter A.4.3.2 --- Surface Integration of Pyramidal Elements --- p.117 / Chapter A.5 --- Simulation Setup with BRICK+PRISM+higher order TETRA --- p.119 / References / Books: / Journals and Papers: / for Hierarchal Edge Bases and FEM Formulations: / for ABC and PML: / for Mesh Generation: / for Free FEM Source Code Matrix Solver: / Miscellaneous:

For size miniaturization and cost reduction, the design of dual band devices has become an emerging research area in recent years. A desirable dual-band solution should offer size compactness, high performance (e.g. low insertion loss) and compatible with conventional printed circuit broad (PCB) technology, especially microstrip lines. / In this research, several new devices, including rat-race coupler, power divider and crossover junction, capable of operating at dual frequency bands are proposed. These structures involve only simple branch-line sections and a minimal number of shunt stubs. All characteristic impedances are ranged from 20 O to 100 O. Most designs can operate with wide frequency spacing between the two bands. These designs offer low insertion loss as well as good return loss performances, and are small in size, in compared to the broadband approach. For design purposes, explicit closed-form equations are derived for the evaluation of circuit parameters. In addition, the usable range of these devices with respect to frequency band separation is examined. For verification, various prototypes are constructed by using microstrip technology and in-house fabrication facilities. Both simulated and measured results are presented and compared with state-of-the-art examples. / Microwave passive couplers are widely used in microwave and millimeter-wave applications and communication systems. Common examples are branch line coupler, rat race coupler, power divider, and crossover junction. They are used for the dividing, combining and re-directing of signal power. / Very often, a passive coupler utilizes simple quarter-wavelength transmission lines for implementation which will lead to narrow-band operation. Therefore, it is difficult to deploy such circuit for wide-band or multi-band applications. Multi-section topologies may be used to broaden the operating bandwidth, with which the major drawbacks are enlarged circuit size and the requirement of extreme high (or low) branch-line characteristic impedances. Both are not attractive for mass and low cost production. Conventional design approaches are, therefore, not suitable for modern communication systems with multi-band operation. / Wong, Fai Leung. / Adviser: Michael Cheng. / Source: Dissertation Abstracts International, Volume: 73-06, Section: B, page: . / Thesis (Ph.D.)--Chinese University of Hong Kong, 2011. / Includes bibliographical references (leaves 118-122). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese.

Hu Mengna. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2004. / Includes bibliographical references (leaves 102-105). / Abstracts in English and Chinese. / Abstract --- p.ii / Acknowledgements --- p.iv / Table of Contents --- p.v / Chapter Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- PEEC Modeling Method --- p.1 / Chapter 1.2 --- Overview of the work --- p.2 / Chapter 1.3 --- Original Contributions --- p.3 / Chapter 1.4 --- Organization of the thesis --- p.3 / Chapter Chapter 2 --- CLASSICAL PARTIAL ELEMENT EQUIVALENT CIRCUIT MODELING --- p.4 / Chapter 2.1 --- Introduction --- p.4 / Chapter 2.2 --- Mathematical Formulation in PEEC --- p.5 / Chapter 2.2.1 --- Basic Integral Equation --- p.5 / Chapter 2.2.2 --- Current and Charge discretization --- p.6 / Chapter 2.2.3 --- Galerkin Matching Method --- p.8 / Chapter 2.3 --- Partial Inductance --- p.10 / Chapter 2.3.1 --- General Formula for partial mutual inductance --- p.10 / Chapter 2.3.2 --- Mutual Inductance between two Thin Rectangular Tapes --- p.11 / Chapter 2.4 --- Partial Capacitance --- p.13 / Chapter 2.4.1 --- General Formula for partial mutual capacitance --- p.13 / Chapter 2.4.2 --- Mutual Capacitance Between Two Thin Rectangular Tapes --- p.16 / Chapter 2.5 --- Meshing Scheme --- p.17 / Chapter 2.6 --- Green's function --- p.20 / Chapter 2.6.1 --- Modification on free space Green's function through Ray-tracing technique --- p.20 / Chapter 2.6.2 --- Impact on partial inductance and partial capacitance --- p.22 / Chapter 2.7 --- PEEC Modeling of A LTCC 2.4GHz Band Pass Filter --- p.23 / Chapter 2.7.1 --- General Procedures to apply PEEC Modeling Method --- p.23 / Chapter 2.7.2 --- Numerical Results of a LTCC Band Pass Filter Modeling --- p.24 / Chapter 2.8 --- Summary --- p.27 / Chapter Chapter 3 --- GENERALIZED PEEC MODELING FOR PASSIVE COMPONENT OF IRREGULAR SHAPES --- p.29 / Chapter 3.1 --- Introduction --- p.29 / Chapter 3.2 --- Triangular meshing scheme in MoM --- p.30 / Chapter 3.2.1 --- Triangular meshing scheme adopted in MoM --- p.30 / Chapter 3.2.2 --- Spiral Inductor --- p.32 / Chapter 3.3 --- Generalized Meshing Scheme --- p.34 / Chapter 3.4 --- Mathematical Formulation in Enhanced PEEC --- p.39 / Chapter 3.4.1 --- Current and Charge discretization --- p.39 / Chapter 3.4.2 --- Enhanced Formulation for partial mutual inductance and capacitance --- p.41 / Chapter 3.4.3 --- Four-Dimensional Integration --- p.43 / Chapter 3.4.4 --- Gauss Numerical Integration --- p.44 / Chapter 3.4.5 --- Mixed Numerical and Analytical Technique --- p.47 / Chapter 3.5 --- Numerical Results from Enhanced PEEC Modeling Method --- p.50 / Chapter 3.5.1 --- Spiral Inductor --- p.50 / Chapter 3.5.2 --- High Pass Filter --- p.56 / Chapter 3.5.3 --- Design and Optimization of LTCC Diplexer --- p.60 / Chapter 3.6 --- Summary --- p.67 / Chapter Chapter 4 --- HIGH FREQUENCY PEEC --- p.69 / Chapter 4.1 --- Introduction --- p.69 / Chapter 4.2 --- Spatial Domain Green's Functions --- p.70 / Chapter 4.2.1 --- Full-wave Spectral Domain Green´ةs Functions --- p.70 / Chapter 4.2.2 --- Full-wave Spatial Domain Green，s functions --- p.72 / Chapter 4.3 --- Frequency-dependent Complex Partial Elements --- p.74 / Chapter 4.4 --- Numerical Results Of High-Frequency PEEC Modeling Method --- p.79 / Chapter 4.4.1 --- Numerical Discussion of Complex Image Method --- p.75 / Chapter 4.4.2 --- Microstrip Filter --- p.84 / Chapter 4.4.3 --- Patch Antenna --- p.84 / Chapter 4.5 --- Summary --- p.87 / Chapter Chapter 5 --- CONCLUDING REMARKS --- p.88 / Chapter 5.1 --- Two Enhancements in PEEC Modeling --- p.88 / Chapter 5.2 --- Limitations of Enhanced PEEC Modeling --- p.90 / Chapter 5.3 --- Future Work --- p.90 / APPENDIX --- p.92 / REFERENCE --- p.102

在現代通信系統，無線服務的需求不斷增加，帶動了通信系統，支持多標準的操作需要。 雙波段或多波段操作幾乎都是必要的，能夠提供這些操作的微波器件已成為減小尺寸和降低成本有吸引力的解決方案。 / 分支線耦合器是用於微波和毫米波應用的最流行的無源電路之一。它們通常用於平衡放大器和混頻器去實現良好的回波損耗以及隔離。其中一個至關重要的部份是設計一個可以靈活作多波段分配的分支線耦合器。 / 傳統上，完全平面的實施，雙波段分支線耦合器可以通過短截線，階梯阻抗線，耦合線等不同的分佈式結構實現。不同的設計方案已在這幾年來出現。窄帶操作和複雜的電路設計，是以前的設計的主要缺點。雖然，在理論上，多節技術可以拓寬帶寬，但它的主要缺點是電路的面積變大了及使用極端低/高傳輸線阻抗。因此，它不是一個大量和低成本生產的解決方案。 / 在這項研究中，設計了全新的並增強了性能的雙波段分支線耦合器(零分貝和三分貝的功率分裂)。這些設計能在兩個指定的頻帶有不平等的工作帶寛。通過正確選擇雙頻四分之一波長阻抗變換器的電氣長度和線路阻抗，傳輸相位斜率將能夠被控制並給出帶寬不對稱的特點，其性能可以進一步擴展，涵蓋了廣泛的應用。 / 以上所有設計都只需要單層線路版的制作及可實現的傳輸線阻抗。應用奇/偶模式分析所給出設計公式。這些設計具有低損耗，佈局靈活，緊密的尺寸大小的特性。這些設計己經使用標準微帶的結構實現其特點，其結果得到了實驗結果的進一步驗證。分支線耦合器只需要更小的節數就能實現相同的性能。 / In modern communication systems, the increasing demand for wireless services has driven the need for communication systems that support multi-standard operations. Dual-/Multi- band operation is almost a necessity and the adoption of microwave multi-band devices has become an attractive solution towards size and cost reduction of RF frontend designs. / Branch-line coupler is one of the most popular passive circuits used for microwave and millimeter-wave applications. They are commonly used in balanced amplifiers, phase-shifter, mixer and frequency multipliers for achieving good return loss, as well as isolation. It is therefore essential to have a branch-line coupler with multi-band operation. / Traditionally, for fully planar implementation, the construction of dual-band branch-line couplers are usually accomplished by distributed structures based upon shunt-stub, stepped-impedance line, coupled line etc. Narrow-band operation and circuit complexity are the major drawbacks for these previous designs. Although, in theory, the available bandwidth may be broadened by multi-section configurations, its major tradeoffs are the enlarged circuit size as well as the extreme line dimensions involved. Therefore, it is not preferable to mass and low cost production. / In this research, advanced designs of dual-band branch-line coupler (0 dB and 3 dB power splitting) with enhanced performances are presented. By proper selection of the number of sections, electrical lengths and line impedances of appropriate branch-lines of the coupler, its performance can be further extended to cover a wide range of applications. / All the proposed circuits require only single-layer fabrication and realizable line impedance. Closed form design formulas are made available by the application of even/odd- mode formulation. They feature low loss, flexible layout and compact size. The designs have been implemented and characterized using standard microstrip, and verified experimentally. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Yeung, Sung. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2012. / Includes bibliographical references (leaves 92-95). / Abstracts also in Chinese. / Abstract --- p.ii / 摘要 --- p.iii / Acknowledgement --- p.iv / Table of Content --- p.v / Lists of Figures --- p.viii / Lists of Tables --- p.xii / Chapter Chapter 1 --- : Introduction --- p.1 / Chapter 1.1 --- Research Motivation and Objective --- p.1 / Chapter 1.2 --- Original Contribution --- p.3 / Chapter 1.3 --- Research Approach, Assumptions and Limitations --- p.4 / Chapter 1.4 --- Overview of the Thesis Organization --- p.5 / Chapter Chapter 2 --- : Review of Microwave Coupler Design --- p.6 / Chapter 2.1 --- Coupler Design Fundamental --- p.6 / Chapter 2.1.1 --- Coupler Design with Equal Power Splitting --- p.7 / Chapter 2.1.2 --- Coupler Design with Unequal Power Splitting --- p.12 / Chapter 2.1.3 --- 0-dB Coupler or Crossover --- p.16 / Chapter 2.1.4 --- Coupler Design with Size Miniaturization --- p.18 / Chapter 2.1.5 --- Wide Band Coupler Design --- p.21 / Chapter 2.2 --- Dual-Band and Multi-Band Branch-line Coupler --- p.25 / Chapter 2.2.1 --- Dual-Band Couplers Based on Composite Right/Left-Handed Transmission Line --- p.25 / Chapter 2.2.2 --- Dual-Band Couplers with Shunt Stubs --- p.28 / Chapter 2.2.3 --- Dual-Band Coupler Based on Stepped-Impedance-Stub-Line --- p.30 / Chapter 2.2.4 --- Dual-Band Coupler with Port Extensions --- p.33 / Chapter 2.2.5 --- Tri-Band Coupler Based on Matching Network --- p.35 / Chapter 2.2.6 --- Multi-passband Branch-line Coupler Design --- p.37 / Chapter 2.3 --- Summary --- p.39 / Chapter Chapter 3 --- : A Novel Dual-band 0-dB Branch-line Coupler Design --- p.40 / Chapter 3.1 --- Proposed Circuit --- p.40 / Chapter 3.2 --- Analysis of Single-band 0-dB Branch-line Coupler --- p.43 / Chapter 3.3 --- Single- to Dual-band Conversion --- p.52 / Chapter 3.4 --- Experimental Results --- p.55 / Chapter 3.5 --- Summary --- p.58 / Chapter Chapter 4 --- : A Novel Dual-band 3-dB Branch-line Coupler with Unequal Bandwidth --- p.59 / Chapter 4.1 --- Proposed Dual-band Impedance Transformer: --- p.59 / Chapter 4.2 --- Single-band 3-dB Coupler Design --- p.65 / Chapter 4.3 --- Dual-band 3-dB Coupler Design --- p.70 / Chapter 4.4 --- Experimental Results --- p.76 / Chapter 4.4.1 --- Equal bandwidth design --- p.76 / Chapter 4.4.2 --- Unequal bandwidth design --- p.78 / Chapter 4.5 --- Summary --- p.81 / Chapter Chapter 5 --- : A Novel Dual-band 0-dB Branch-line Coupler Design with Unequal Bandwidth --- p.82 / Chapter 5.1 --- Proposed Circuit --- p.82 / Chapter 5.2 --- Analysis and Formulation --- p.84 / Chapter 5.3 --- Simulation Results --- p.85 / Chapter 5.4 --- Experimental Results --- p.87 / Chapter 5.5 --- Summary --- p.89 / Chapter Chapter 6 --- : Conclusion and Recommendation for Future Work --- p.90 / Chapter 6.1 --- Conclusion --- p.90 / Chapter 6.2 --- Recommendation for future work --- p.91 / References --- p.92 / Author’s Publications --- p.96 / Chapter Appendix 1: --- Brief Summary of Design Approaches of Hybrids Couplers --- p.97 / Chapter Appendix 2: --- Transformation between S- and ABCD- parameters for two-port network --- p.99

Law, Carlos. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2008. / Includes bibliographical references (leaves 119-122). / Abstracts in English and Chinese. / Abstract --- p.i / 論文摘要 --- p.iii / Acknowledgement --- p.v / Table of Content --- p.vi / List of Figures --- p.ix / List of Tables --- p.xv / List of Abbreviations --- p.xvi / Chapter Chapter 1: --- Introduction --- p.1 / Chapter 1.1 --- Emergence of Multi-band Microwave Circuits --- p.1 / Chapter 1.2 --- Original Contribution --- p.2 / Chapter 1.3 --- Overview of the Thesis Organization --- p.3 / Chapter 1.4 --- "Research Approach, Assumptions and Limitations" --- p.5 / Chapter Chapter 2： --- Fundamentals in Filter and Power Divider Design --- p.7 / Chapter 2.1 --- Filter --- p.7 / Chapter 2.1.1 --- Introduction to Filters --- p.7 / Chapter 2.1.2 --- Transfer Function --- p.8 / Chapter 2.1.3 --- Low-pass Prototype and Elements --- p.11 / Chapter 2.1.4 --- Admittance Inverters --- p.13 / Chapter 2.2 --- Power Divider --- p.20 / Chapter 2.2.1 --- Introduction to Power Dividers --- p.20 / Chapter 2.2.2 --- Wilkinson Power Divider --- p.21 / Chapter 2.2.3 --- Multi-section Power Divider --- p.25 / Chapter 2.2.4 --- Power Divider with Unequal Power Division --- p.27 / Chapter Chapter 3： --- Conventional Multi-band Designs --- p.29 / Chapter 3.1 --- Micro-strip Multi-band Filters --- p.29 / Chapter 3.1.1 --- Parallel Connection of Two Single-band Filters --- p.29 / Chapter 3.1.2 --- "Wide-band, Band-pass Filter and a Band-stop Filter in Cascade" --- p.32 / Chapter 3.1.3 --- Parallel-coupled SIR-based Dual-band Filter --- p.33 / Chapter 3.1.4 --- Vertical-stacked SIR-based Dual-band Filter --- p.34 / Chapter 3.1.5 --- Cross-coupled Hairpin SIR Dual-band Filter --- p.37 / Chapter 3.1.6 --- Folded Open-loop Ring Resonator-based Multi-band Filters --- p.38 / Chapter 3.1.7 --- Stubbed SIR-based Single-band Filter --- p.40 / Chapter 3.1.8 --- Open and Short-circuited Stub-based Dual-band Filter --- p.41 / Chapter 3.1.9 --- Open Stub-based Dual-band Filter --- p.42 / Chapter 3.2 --- Spurious Suppression Techniques for Filters --- p.43 / Chapter 3.2.1 --- Insertion of Band-reject Filters --- p.43 / Chapter 3.2.2 --- Equalization of Eigen-mode Phase Velocities --- p.43 / Chapter 3.2.3 --- Insertion of Open Stubs --- p.45 / Chapter 3.2.4 --- Coupled SIR-based Structures --- p.47 / Chapter 3.2.5 --- Parallel Coupled Line --- p.49 / Chapter 3.2.6 --- Others --- p.50 / Chapter 3.3 --- Dual-band Power Dividers --- p.51 / Chapter 3.3.1 --- Two-section Transmission Line Topology --- p.51 / Chapter 3.3.2 --- Lumped Element-based Topology --- p.53 / Chapter 3.3.3 --- Shunt Stub Topology --- p.56 / Chapter Chapter 4: --- New Dual-band Filter with Wide Upper Stop-band … --- p.59 / Chapter 4.1 --- Proposed Topology --- p.60 / Chapter 4.2 --- Design and Analysis --- p.61 / Chapter 4.3 --- Design Example --- p.73 / Chapter 4.4 --- Summary --- p.79 / Chapter Chapter 5: --- New Tri-band Filter Design --- p.80 / Chapter 5.1 --- Proposed Topology --- p.80 / Chapter 5.2 --- Design and Analysis --- p.82 / Chapter 5.3 --- Design Example --- p.86 / Chapter 5.4 --- Summary --- p.91 / Chapter Chapter 6: --- New Dual-band Power Divider Design I --- p.92 / Chapter 6.1 --- Proposed Topology --- p.92 / Chapter 6.2 --- Design and Analysis --- p.94 / Chapter 6.3 --- Design Example --- p.98 / Chapter 6.4 --- Summary --- p.107 / Chapter Chapter 7: --- New Dual-band Power Divider Design II --- p.108 / Chapter 7.1 --- Proposed Topology --- p.108 / Chapter 7.2 --- Design and Analysis --- p.109 / Chapter 7.3 --- Design Example --- p.112 / Chapter 7.4 --- Summary --- p.115 / Chapter Chapter 8: --- Conclusion --- p.116 / Recommendation for Future Work --- p.118 / References --- p.119 / Author's Publications --- p.123 / Appendix 1: ABCD Parameters --- p.124 / Appendix 2: Program for Tri-band Filter --- p.125 / Appendix 3: Comparison of Dual-band Power Dividers --- p.129 / Appendix 4: Sensitivity of Power Divider to Resistor Variation --- p.146

No description available.

Thesis (Ph. D.)--University of Nevada, Reno, 2005. / "December 2005." Includes bibliographical references (leaves 213-220). Online version available on the World Wide Web. Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2005]. 1 microfilm reel ; 35 mm.

There is often a need to interpolate data that is obtained through experiment or computational analysis, because the data is difficult or expensive to obtain. An example is the scattering parameters of microwave devices, obtained through computationally intensive finite element (FE) analysis. Cauchy interpolation is an established solution to this problem. In this thesis it is extended to interpolate data over a multi-parameter space, when the data available includes not just the function to be interpolated, but also its derivatives with respect to each parameter. The finite element method (FEM) provides such derivatives. The new algorithm is applied to a simple RLC circuit test case, and to real data from a 3D FE analysis of a rectangular waveguide component, in a 4-parameter space. Results show the effectiveness of the approach taken.

Travelling-wave distributed amplifiers are providing gain over broad frequency ranges for microwave applications. Similar concepts are applicable to distributed mixers and, with the use of controlled feedback, to a multifunction component simultaneously emulating a mixer, amplifier and an oscillator. The concept of this new travelling-wave frequency converter is introduced and data for a discrete component test circuit is presented. To facilitate the converter operation a new three-port travelling-wave mixer is introduced and characterized. Four-port scattering and wave scattering transformations are derived as a method of analysis of the four-port distributed structure. This enables sequential circuit analysis on a small computer. Practical applications unique to the advanced automatic network analyser, including time domain measurements, are presented to characterize test circuits as well as to develop ancillary equipment such as a transistor test fixture. Automated error corrected transistor measurements and de-embedding are also discussed. A piecewise linear quantum mechanical method of modelling the conduction channel of a short gate field effect transistor is given to aid the extrapolation of the distributed frequency converter concept to submicron and heterojunction structures. / Thesis (Ph.D.)-University of Natal, Durban, 1985.