The advent of low-cost RFIC's fabricated in Silicon-based technologies has led to the use of monolithic lumped elements which are located on-die. While it is clearly advantageous to have a high degree of integration and thus fewer off chip elements, parasitic losses due to semiconducting substrate effects can be a performance-limiting factor. Microstrip spiral inductors are key components in many high frequency circuit designs, including MMIC's, RFIC's, and mixed-signal modules. However, the losses associated with spirals fabricated in a lossy substrate environment, such as in CMOS and bipolar technologies, are not accurately modeled by the current conventional techniques. This thesis presents a complete modeling technique for spiral inductors over such 'high-loss' substrates. The quasi-static solution for single and coupled Metal-Insulator-Substrate (MIS) microstrip structures has led to the development of methods for calculating the self and mutual line parameters r, l, g, and c, which are in turn utilized in the model for the microstrip spiral inductors in the same environment. The equivalent circuit model for the spiral inductors is based on the conventional low-loss spiral models with the inclusion of frequency-dependent losses due to semiconducting substrates. The distributed model for spirals in CMOS-based RFICs incorporates inductance calculations by the Partial Element Equivalent Circuit (PEEC) method, augmented by inductance and resistance calculations for the so-called skin effect mode by the spectral domain technique. In addition, the capacitances and shunt conductances can be computed by a Poisson solver for layered lossy media; both network analog and spectral domain methods are also used to find the shunt admittance per unit length for the microstrip structure as a fundamental element of the spiral. Simulations for typical structures have been performed to validate the modeling techniques via comparison with a commercial simulator and network analyzer measurements for a 9.5 turn spiral in CMOS for RFIC applications. / Graduation date: 1999

Thesis (Ph.D.)--City University of Hong Kong, 2006. / "Submitted to Department of Electronic Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy" Includes bibliographical references.

The propagation characteristics of a new coupled fin line structure, with asymetrical, rectangular, top and bottom housings, is evaluated by using the modal analysis technique. The boundary Green's function of the structure, relating the surface currents to the electric fields is derived by using this technique. The propagation characteristics, i.e. propagation constant and impedances, of the structure are determined by implementing Galerkin's procedure and the results are presented for a wide range of possible structure dimensions. A CAD compatible, quasistatic analysis based on conformal mapping of the rectangular housing structure and known coplanar waveguide results is also presented. The results of the quasistatic analysis are shown to be in good agreement with the fullwave simulation at low frequencies. / Graduation date: 1993

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Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2008. / Includes bibliographical references (leaves 69-77). Also available in electronic version.

This thesis describes a method for using stripline resonators to characterize the electrical properties of materials used in the construction of planar geometry transmission lines and circuits. The method characterizes both dielectric and conductor materials. It can be used to find the relative dielectric constant and to separate the conductor and dielectric losses. The separation of the loss terms is achieved by fitting measurements of stripline losses to a well known model. This model identifies the loss terms separately based on variation of the losses with stripline dimensions. This thesis presents the complete stripline resonator model used. The model has been incorporated into a computer simulation which predicts the resonator response. This simulation is useful in many ways, including the design of various resonators needed in experiments. Also presented are the results of an experiment which demonstrates the feasibility of this method when applied to real samples. These results show that this method works well for low loss materials. Further development may produce 6 model which will allow this method to be used on higher loss materials. A similar theoretical derivation may be used to develop a model for using this method with other transmission line structures such as coaxial lines. This method is advantageous because it does not assume that material properties are independent of frequency and can be designed to produce results at a specific frequency. Stripline resonators are easily manufactured and a network analyzer is the only test equipment required. For these reasons, this method can be used to provide accurate results at a low cost. / Master of Science

Liang Tak-keung. / "June 2004." / Thesis (Ph.D.)--Chinese University of Hong Kong, 2004. / Includes bibliographical references. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.

In this thesis the network analog method is used to analyze various planar multi-conductor structures in multilayered, lossy dielectric media. The method is based on an efficient impedance network representation of the finite difference approximation of Laplace's equation for the electric potential. Using the network analog method, the transmission line parameters are computed for several different uniform stripline structures in lossless and lossy multilayered dielectric material. The network analog method is also applied to several three-dimensional structures consisting of single and coupled conducting patches of rectangular shape. Results obtained with the network analog method for single conducting patches in single and multilayered lossless dielectric media are in good agreement with published results based on a variational approach. Further results presented in this thesis include the coupling capacitance for coplanar and multilevel patch configurations in lossless and lossy multilayered dielectric media. / Graduation date: 2000