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Yes / This study presents an original asymmetric stepped-impedance resonator filter combined with meander coupled-line structures and enabling the realisation of finite transmission zeros (TZs) and the implementation of multi-band bandpass filters. The meander coupled sections (MCSs) tune the TZs and resonant frequencies: with higher-order spurious frequencies cancelled by the TZs, a single wideband with wide stopband from 1.18 to 1.84 GHz is possible. Furthermore, by positioning the finite TZs between the high-order spurious frequencies and adjusting the coupling strength between resonators, a quint-wideband filter can be realised, with centre frequencies of 1.19, 4.29, 5.43, 6.97, 9.9 GHz and fractional bandwidths of 31.9, 15.4, 15.8, 4.3, 39.2%, respectively. More importantly, two filters with single/quad-wideband performance can be realised by tuning the parameters of the MCS, and therefore they can be designed separately by using only one original structure. The triple-wideband filter is realised with the help of the asymmetric parallel uncoupled microstrip section. These filter structures enjoy the advantage of single/multi-band versatility, structure reusability and simplicity. The good in-band and out-of-band performance, low loss and simple structure of the proposed single/tri/quint-wideband filters make them very promising for applications in future multi-standard wireless communication. / European Union's Horizon 2020 research and innovation programme under Grant agreement H2020-MSCA-ITN-2016 SECRET-722424.

by Tam Yuk-ho. / Bibliography: leaves 93-94 / Thesis (M.Ph.)--Chinese University of Hong Kong, 1986

Yeung Nang Ching. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2005. / Includes bibliographical references (leaves 72-74). / Abstracts in English and Chinese. / ACKNOWLEDGMENTS --- p.I / ABSTRACT --- p.II / 摘要 --- p.III / TABLE OF CONTENTS --- p.IV / LIST OF FIGURES --- p.VII / LIST OF TABLES --- p.X / Chapter CHAPTER 1 --- INTRODUCTION --- p.1 / Chapter 1.1 --- Overview of filter --- p.1 / Chapter 1.1.1 --- History --- p.1 / Chapter 1.1.2 --- Application of analog filter --- p.2 / Chapter 1.1.3 --- Category of continuous time filters --- p.3 / Chapter 1.1.4 --- Problem issued from Active RC filter --- p.7 / Chapter 1.2 --- Motivation --- p.7 / Chapter 1.3 --- Outline --- p.8 / Chapter CHAPTER 2 --- FILTER FUNDAMENTAL --- p.9 / Chapter 2.1 --- Overview --- p.9 / Chapter 2.2 --- Terminology --- p.9 / Chapter 2.3 --- General Goals of Filter Design --- p.11 / Chapter 2.4 --- Standard Lowpass Filter Characteristic --- p.11 / Chapter 2.4.1 --- Butterworth --- p.11 / Chapter 2.4.2 --- Chebyshev --- p.12 / Chapter 2.4.3 --- Elliptic-Function --- p.13 / Chapter 2.5 --- Study on Different Tuning Approaches --- p.13 / Chapter CHAPTER 3 --- CURRENT DIVISION NETWORK (CDN) --- p.18 / Chapter 3.1 --- Overview of Current Division Technique --- p.18 / Chapter 3.2 --- Second Order Effects --- p.23 / Chapter 3.3 --- Working Principle of CDN --- p.23 / Chapter 3.4 --- Performances of CDN --- p.25 / Chapter 3.4.1 --- General Properties of CDN --- p.25 / Chapter 3.4.2 --- Input Resistances of CDN --- p.26 / Chapter 3.4.3 --- Noise Performance of CDN --- p.27 / Chapter CHAPTER 4 --- REALIZATION OF THE FILTER --- p.31 / Chapter 4.1 --- Overview --- p.31 / Chapter 4.2 --- Traditional Kerwin Huelsman Newcomb (KHN) Biquad --- p.31 / Chapter 4.2.1 --- State Variable Method --- p.31 / Chapter 4.2.2 --- KHN Biquad --- p.32 / Chapter 4.3 --- Proposed Filter --- p.33 / Chapter 4.3.1 --- Biquad with CDN --- p.33 / Chapter 4.3.2 --- A dvantages of Proposed Filter --- p.36 / Chapter 4.3.3 --- Schematic of Proposed Filter --- p.38 / Chapter CHAPTER 5 --- LAYOUT CONSIDERATION --- p.41 / Chapter 5.1 --- Overview --- p.41 / Chapter 5.2 --- Process Information --- p.41 / Chapter 5.3 --- Transistor Layout Techniques --- p.42 / Chapter 5.3.1 --- Multi-finger Layout Technique --- p.42 / Chapter 5.3.2 --- Common-Centroid Structure --- p.43 / Chapter 5.3.3 --- Guard Ring --- p.45 / Chapter 5.4 --- Passive Element Layout Techniques --- p.45 / Chapter 5.5 --- Layout of Whole Design --- p.47 / Chapter CHAPTER 6 --- SIMULATION RESULT --- p.49 / Chapter 6.1 --- Operational Amplifier --- p.49 / Chapter 6.2 --- Overall Performance of filter --- p.55 / Chapter CHAPTER 7 --- MEASUREMENT RESULT --- p.60 / Chapter 7.1 --- Measurement Setup --- p.60 / Chapter 7.2 --- Time Domain Measurement --- p.62 / Chapter 7.3 --- Frequency Domain Measurement --- p.63 / Chapter 7.4 --- Measurement of Non-Linearity --- p.66 / Chapter 7.5 --- Summary of the Performance --- p.69 / Chapter 7.6 --- Comparison on Tuning Ability --- p.70 / Chapter CHAPTER 8 --- CONCLUSION --- p.71 / BIBLIOGRAPHY --- p.72

Leung Wing-Yan. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2001. / Includes bibliographical references (leaves 131-135). / Abstracts in English and Chinese. / Chapter Chapter 1 --- Introduction --- p.1 / Chapter Chapter 2 --- Background Theory --- p.3 / Chapter 2.1 --- Low-Pass Network Synthesis --- p.3 / Chapter 2.2 --- Maximally Flat Attenuation Characteristic --- p.5 / Chapter 2.3 --- Chebysheff Attenuation Characteristic --- p.6 / Chapter 2.4 --- Low-Pass to Band-Pass Transformation --- p.8 / Chapter 2.5 --- Impedance- and Admittance- Inverters --- p.9 / Chapter 2.6 --- Coupled-Resonator Filters --- p.13 / Chapter Chapter 3 --- New Circuit Topologies for Band-Pass Filters --- p.18 / Chapter 3.1 --- Locations of Transmission Zeros --- p.18 / Chapter 3.2 --- Circuit Topologies for Generation of Transmission Zeros --- p.18 / Chapter 3.3 --- Zeros at Lower Stop-Band (Category 1) --- p.21 / Chapter 3.3.1 --- Capacitor Insertions --- p.21 / Chapter 3.3.2 --- Design Equations for Configuration I --- p.22 / Chapter 3.3.3 --- Design Equations for Configuration II --- p.24 / Chapter 3.3.4 --- Coupling between Components --- p.28 / Chapter 3.3.5 --- Design Equations for Configuration III --- p.28 / Chapter 3.4 --- Zeros at Upper Stop-Band (Category 2) --- p.32 / Chapter 3.4.1 --- Inductor Insertions --- p.32 / Chapter 3.4.2 --- Design Equations for Configuration IV --- p.33 / Chapter 3.4.3 --- Design Equations for Configuration V --- p.35 / Chapter 3.4.4 --- Coupling between Components --- p.38 / Chapter 3.4.5 --- Design Equations for Configuration VI --- p.39 / Chapter 3.4.6 --- Design Equations for Configuration VII --- p.43 / Chapter 3.5 --- Zeros at Both Lower and Upper Stop-band (Category 3) --- p.46 / Chapter 3.5.1 --- Component Insertions --- p.46 / Chapter 3.5.2 --- Design Equations for Configuration VIII --- p.49 / Chapter 3.5.3 --- Design Equations for Configuration IX-XI --- p.49 / Chapter 3.5.4 --- Coupling between components --- p.50 / Chapter 3.5.5 --- Design Equations for Configuration XII --- p.51 / Chapter Chapter 4 --- Design Considerations --- p.52 / Chapter 4.1 --- Analytical Limitation --- p.53 / Chapter 4.1.1 --- "Conventional Band-Pass Filter, Configuration II, III, V and VI" --- p.53 / Chapter 4.1.2 --- Configuration I --- p.55 / Chapter 4.1.3 --- Configuration II --- p.57 / Chapter 4.1.4 --- Configuration IV --- p.59 / Chapter 4.1.5 --- Configuration VII-XII --- p.61 / Chapter 4.1.6 --- Summary --- p.61 / Chapter 4.2 --- Practical Limitation --- p.62 / Chapter 4.2.1 --- Configuration I --- p.64 / Chapter 4.2.2 --- Configuration II --- p.65 / Chapter 4.2.3 --- Configuration III --- p.67 / Chapter 4.2.4 --- Configuration IV --- p.69 / Chapter 4.2.5 --- Configuration V --- p.71 / Chapter 4.2.6 --- Configuration VI --- p.73 / Chapter 4.2.7 --- Summary --- p.75 / Chapter 4.3 --- Comparisons between Different Configurations --- p.76 / Chapter 4.3.1 --- Category 1 (Transmission Zeros at Lower Stop-Band) --- p.76 / Chapter 4.3.2 --- Category 2 (Transmission Zeros at Upper Stop-Band) --- p.79 / Chapter 4.3.3 --- Category 3 (Transmission Zeros at both side of the Stop-Band) --- p.82 / Chapter Chapter 5 --- LTCC Technology --- p.84 / Chapter 5.1 --- Definition --- p.84 / Chapter 5.2 --- Fabrication Process --- p.85 / Chapter 5.3 --- Material Used --- p.86 / Chapter 5.3.1 --- Conductive Materials --- p.86 / Chapter 5.3.2 --- Ceramic Materials --- p.87 / Chapter 5.4 --- Advantages of LTCC Technology --- p.87 / Chapter 5.5 --- Recent Development in LTCC Technology --- p.89 / Chapter 5.6 --- Design Rules --- p.90 / Chapter 5.7 --- Realization of Passive Elements in LTCC --- p.91 / Chapter 5.7.1 --- Capacitors --- p.91 / Chapter 5.7.2 --- Inductors --- p.96 / Chapter 5.7.3 --- Effect of Ground Plane on Inductance Realization --- p.99 / Chapter Chapter 6 --- Implementation and Characterization of LTCC Band-Pass Filter --- p.101 / Chapter 6.1 --- Design Procedures --- p.101 / Chapter 6.2 --- Schematic Design of LTCC Filters --- p.103 / Chapter 6.2.1 --- Category1 --- p.103 / Chapter 6.2.2 --- Category2 --- p.104 / Chapter 6.2.3 --- Category3 --- p.105 / Chapter 6.3 --- Design and Optimization --- p.106 / Chapter 6.4 --- Performance Evaluation --- p.117 / Chapter 6.4.1 --- TRL Calibration Method --- p.119 / Chapter 6.4.2 --- Experimental Results --- p.126 / Chapter Chapter 7 --- Conclusion and Recommendations for Future Work --- p.129 / References --- p.131 / Author´ةs Publication --- p.135 / Appendix A CAD Tool for LTCC Circuit Prototyping --- p.136 / Appendix B Computer Program 1 Listing --- p.153 / Appendix C Computer Program 2 Listing --- p.170 / Appendix D Computer Program 3 Listing --- p.172

The design of envelope-constrained (EC) filters is considered for the time-domain synthesis of filters for signal processing problems. The objective is to achieve minimal noise enhancement where the shape of the filter output to a specified input signal is constrained to lie within prescribed upper and lower bounds. Traditionally, problems of this type were treated by using the least-square (LS) approach. However, in many practical signal processing problems, this "soft" least-square approach is unsatisfactory because large narrow excursions from the desired shape occur so that the norm of the filter can be large and the choice of an appropriate weighting function is not obvious. Moreover, the solution can be sensitive to the detailed structure of the desired pulse, and it is usually not obvious how the shape of the desired pulse should be altered in order to improve on the solution. The "hard" EC filter formulation is more relevant than the "soft" LS approach in a variety of signal processing fields such as robust antenna and filter design, communication channel equalization, and pulse compression in radar and sonar. The distinctive feature is the set of inequality constraints on the output waveform: rather than attempting to match a specific desired pulse, we deal with a whole set of allowable outputs and seek an optimal point of that set.The EC optimal filter design problems involve a convex quadratic cost function and a number of linear inequality constraints. These EC filtering problems are classified into: discrete-time EC filtering problem, continuous-time EC filtering problem, and adaptive discrete-time EC filtering problem.The discrete-time EC filtering problem is handled using the discrete Lagrangian duality theory in combination with the space transformation function. The optimal solution of the dual problem can be computed by finding the limiting point of ++ / an ordinary differential equation given in terms of the gradient flow. Two iterative algorithms utilizing the simple structure of the gradient flow are developed via discretizing the differential equations. Their convergence properties are derived for a deterministic environment. From the primal-dual relationship, the corresponding sequence of approximate solutions to the original discrete-time EC filtering problem is obtained.The continuous-time EC filtering problem (semi-infinite convex programming problem) is handled using the continuous Lagrangian duality theory and Caratheodory's dimensionality theory. Several important properties are derived and discussed in relation to practical engineering requirements. These include the observation that the continuous-time optimal filter via orthonormal filters has the structure of a matched filter in cascade with another filter. Furthermore, the semi-infinite convex programming problem is converted into an equivalent finite dual optimization problem, which can be solved by the optimization methods developed. Another issue, which relates to the continuous-time optimal filter design problem, is the design of robust optimal EC filters. The robustness issue arises because the solution of the EC filtering problem lies on the boundary of the feasible region. Thus, any disturbance in the prescribed input signal or errors in the implementation of the optimal filter are likely to result in the output constraints being violated. A detailed formulation and a corresponding design method for improving the robustness of optimal EC filters are given.Finally, an adaptive algorithm suitable for a stochastic environment is presented. The convergence properties of the algorithm in a stochastic environment are established.

The mechanism of how pulsatile flow affects flux behaviour in crossflow micro-filtration was investigated. The effects of pulsatile flow were sub-divided into shear effects and backflushing effects. A servo-valve hydraulic piston pump was applied to generate pulsatile flows in the membrane module with particular waveforms. Four types of fluid pulsation with specific flow-rate and pressure waveforms were produced for experimental tests. Two parameters, /dVcf\dt/ maxand Pmin, were examined independently for their effect during pulsatile flow, which was estimated by comparing the cake resistance during steady flow and pulsatile flow at the same mean crossflow velocity, trans-membrane pressure and membrane resistance. Filtration tests for all the pulsatile flows with clean water confirmed that pulsatility only affects cake depositions. Without particles, no flux improvement was obtained. The results for the microfiltration of 0.5g/1 silica suspension showed that for pulsatile flows without backflushing (i.e. no negative transmembrane pressure peak), the fluid pulsation decreased cake resistance when the shear related parameter /dVcf\dt/max exceeded a critical value for each given waveform. When the instantaneous transmembrane pressure reached negative values, i.e. back-flushing occurred, the cake resistance was reduced for all pressure waves tested. Cake resistance was reduced more for more negative P min. With two of the waveforms tested, the cake resistance was almost completely eliminated. In contrast, the shear affected cake resistance reduction differently for each waveform. Comparing cake reduction results for different pulsatile waveforms, it was found that, for the square wave, the cake resistance reduction was higher for both shear and backflushing effect tests, while for the short spike waveform, the cake resistance reduction was lower. The flux waveforms were seen to follow the variations in transmembrane pressure. The flux response time was longer than the time required for the pressure changes, but was not dependent on the direction of the pressure change.