The purpose of this thesis is to present a mathematical model in which we describe the theoretical approximation of the elliptic filters. From this theoretical treatment, the transfer function and its magnitude, as well as its poles and zeros, were programmed in Turbo Pascal for AT&T and IBM (PC/XT/AT) personal computers and their compatibles. The program, PC-ELLIP, also calculates the element values for double terminated two-port networks. Source code is included.

No description available.

by Yeung, Lap Kun. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2002. / Includes bibliographical references (leaves 96-98). / Abstracts in English and Chinese. / Abstract --- p.ii / Acknowledgements --- p.iv / Table of Contents --- p.v / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Emergence of LTCC Technology --- p.1 / Chapter 1.2 --- Overview of the Work --- p.2 / Chapter 1.3 --- Original Contributions --- p.3 / Chapter 1.4 --- Thesis Organization --- p.4 / Chapter 2 --- Fundamentals of Partial Element Equivalent Circuit Modeling --- p.5 / Chapter 2.1 --- Introduction --- p.5 / Chapter 2.2 --- PEEC Formulation --- p.6 / Chapter 2.2.1 --- Mixed potential integral equation --- p.6 / Chapter 2.2.2 --- Current discretization --- p.7 / Chapter 2.2.3 --- Charge discretization --- p.8 / Chapter 2.2.4 --- Galerkin matching --- p.9 / Chapter 2.3 --- Partial Inductance --- p.11 / Chapter 2.4 --- Partial Capacitance --- p.12 / Chapter 2.5 --- Meshing Scheme and Circuit Interpretation --- p.13 / Chapter 2.6 --- Summary --- p.15 / Chapter 3 --- PEEC Modeling of LTCC RF Circuits using Thin-film Approximation --- p.16 / Chapter 3.1 --- Introduction --- p.16 / Chapter 3.2 --- A Simple LTCC Band-pass Filter --- p.17 / Chapter 3.3 --- Discretization Scheme --- p.18 / Chapter 3.4 --- Quasi-static Green's Functions --- p.21 / Chapter 3.4.1 --- Free-space Green's function --- p.21 / Chapter 3.4.2 --- System with a single ground plane --- p.22 / Chapter 3.4.3 --- System with two ground planes --- p.25 / Chapter 3.5 --- Complex-Image Analysis --- p.25 / Chapter 3.6 --- Partial Inductance --- p.31 / Chapter 3.6.1 --- Strip-to-strip inductance --- p.31 / Chapter 3.6.2 --- System with one or more ground planes --- p.33 / Chapter 3.7 --- Partial Capacitance --- p.34 / Chapter 3.8 --- Numerical and Experimental Results --- p.37 / Chapter 3.9 --- Summary --- p.40 / Chapter 4 --- PEEC Modeling of LTCC RF Circuits using Thin-film Approximation (Via-hole Modeling) --- p.41 / Chapter 4.1 --- Introduction --- p.41 / Chapter 4.2 --- Via-hole Modeling --- p.42 / Chapter 4.2.1 --- Discretization scheme --- p.42 / Chapter 4.2.2 --- Inductance formulae --- p.43 / Chapter 4.2.3 --- Empirical formula --- p.46 / Chapter 4.2.4 --- Edge-effect compensation --- p.48 / Chapter 4.3 --- Numerical and Experimental Results --- p.49 / Chapter 4.4 --- Summary --- p.51 / Chapter 5 --- An Efficient PEEC Algorithm for Modeling of LTCC RF Circuits with Finite Metal Strip Thickness --- p.53 / Chapter 5.1 --- Introduction --- p.53 / Chapter 5.2 --- PEEC Modeling using Thin-film Approximation --- p.54 / Chapter 5.3 --- PEEC Modeling with Finite Metal Thickness --- p.55 / Chapter 5.4 --- Edge-effect Compensation in Inductance Calculation --- p.57 / Chapter 5.5 --- Numerical and Experimental Results --- p.61 / Chapter 5.6 --- Summary --- p.65 / Chapter 6 --- A Compact Second-order LTCC Band-pass Filter with Two Finite Transmission Zeros --- p.66 / Chapter 6.1 --- Introduction --- p.66 / Chapter 6.2 --- Features of the Filter --- p.67 / Chapter 6.3 --- Design Theory --- p.68 / Chapter 6.4 --- LTCC Filter Implementation --- p.70 / Chapter 6.4.1 --- Circuit model --- p.70 / Chapter 6.4.2 --- Physical layout --- p.73 / Chapter 6.5 --- Experimental Results --- p.75 / Chapter 6.6 --- Summary --- p.77 / Chapter 7 --- Concluding Remarks --- p.79 / Chapter 7.1 --- PEEC Modeling --- p.79 / Chapter 7.2 --- Limitations of the Algorithm --- p.80 / Chapter 7.3 --- Further Improvements --- p.81 / Appendix --- p.82 / References --- p.96 / Author's Publications --- p.98

CAPES / Este trabalho apresenta o desenvolvimento de metodologias para dimensionamento de filtros passivos para conversores estáticos de potência conectados à rede ou em operação como fonte ininterrupta de energia, do Inglês, Uninterruptible Power Supply (UPS). São apresentadas novas metodologias para o dimensionamento de filtro indutivo (L) e filtro indutivo-capacitivo-indutivo (LCL) para conexão de conversores à rede de distribuição e uma metodologia para o dimensionamento de filtro indutivo-capacitivo (LC) para conversores estáticos operando como UPS. Para o filtro L, são apresentadas metodologias baseadas no valor do pico da ondulação de corrente no indutor ou em funções de transferência dos circuitos equivalentes e objetivam garantir que a distorção harmônica total de corrente (DHTi) no ponto de conexão comum não ultrapasse os valores estabelecidos por normas específicas. Para a metodologia proposta para o filtro LCL, além da DHTi, a frequência de ressonância ( fres), o coeficiente de amortecimento (x ) e fator de potência no ponto de conexão comum (FP) são parâmetros de projeto a serem atendidos pelo filtro projetado. A metodologia de dimensionamento de filtro é baseada em funções de transferência de circuitos equivalentes. Para o filtro LC, a metodologia também é baseada na função de transferência de um circuito equivalente e utiliza como parâmetros de projeto que devem ser atendido, a distorção harmônica total de tensão (DHTv) sobre a carga e o coeficiente de amortecimento. Para a verificação das metodologias propostas são utilizadas simulações computacionais por meio do software PSIM e, posteriormente, são apresentados resultados de ensaios experimentais utilizando-se de uma plataforma experimental desenvolvida para este fim para corroborar as propostas de projeto dos filtros L, LC e LCL. / This work presents the development of design methodologies for passive filters for static power converters connected to the network or operating in islanded mode. Methodologies for the design of inductive (L) filter and inductive-capacitive-inductive (LCL) filter for network connection and inductive-capacitive filter (LC) for converters operating as uninterruptible power supply (UPS) will be presented. For the L filter, methodologies based on the peak value of the current ripple in the inductor or on transfer functions of equivalent circuits are presented and aim to ensure that the total harmonic distortion of current (THDi) in the point of common connection does not exceed the values defined by specific rules. For the proposed methodology for the LCL filter, in addition to THDi, the resonance frequency, the damping coefficient of filter and the power factor in the point of common connection are design parameters to be met by the filter designed. The filter design methodology is based on equivalent circuit. The total harmonic distortion of voltage (THDv) and the damping coefficient are considered as design parameters. To corroborate the proposal, PSIM simulations are used and experimental results are also presented.

Thesis (PhD)--Macquarie University, Faculty of Science, Dept. of Physics & Engineering, 2008. / "March, 2009". Bibliography: p. 145-158.

"March, 2009". / Thesis (PhD)--Macquarie University, Faculty of Science, Dept. of Physics & Engineering, 2008. / Bibliography: p. 145-158. / Introduction -- Frequency selective surfaces -- Absorb/transmit frequency selective surface absorber -- Switchable frequency selective surface for wireless applications -- Energy-saving glass characterisation -- Frequency selective surface solution for energy-saving glass -- Conclusion. / This thesis presents three topics related to frequency selective surfaces (FSSs), namely bsorb/transmit FSSs, active FSSs and passive bandpass FSSs for energy-saving glass used in modern buildings. These three FSSs are unique in their design and functionalities. The absorb/transmit FSS is a novel dual-layer frequency selective surface for 5 GHz WLAN applications. This FSS can stop propagation of specific bands by absorbing as opposed to re ecting, while passing other useful signals. This is in contrast to the conventional Salisbury and Jaumann absorbers, which provide good absorption in the desired band while the out-of-band frequencies are attenuated. The second topic is a single-layer bandpass active FSS that can be switched between ON and OFF states to control the transmission in 2.45 GHz WLAN applications. Previously, researchers have focused on the bandstop and dual-layer versions of the active FSS. This is in contrast to the design presented in this thesis which is single-layer and provides extra advantage in a practical WLAN environment. Also the dc biasing techniques that were used for the active FSS design are easier to implement and provide good frequency stability for different angles of incidence and polarisations in both ON and OFF states. The last topic is on the use of a bandpass FSS in energy-saving glass panels used in building design. The manufacturers of these glass panels apply a very thin metal-oxide coating on one side of the glass panels to provide extra infrared (heat) attenuation. However, due to the presence of the coating, these energy-saving glass panels also attenuate communication signals such as GSM 900, GSM 1800/1900, UMTS and 3G mobile signals etc. This creates a major communication problem when buildings are constructed with windows of this glass. In this thesis, a solution to this problem is presented by designing and etching a cross-dipole bandpass FSS on the coated side of the glass to pass the useful signals while keeping infrared attenuation at an acceptable level. One of the advantages of this FSS design is that measured material values of the metal-oxide coating are used for simulations, which have not been done previously. / Mode of access: World Wide Web. / 166 p. ill. (some col.)