Chirowaveguides with complex geometry / Thomas Xinzhang Wu.

Format:

Book

Manuscript

Microformat

Thesis/Dissertation

Author/Creator:

Wu, Thomas Xinzhang.

Contributor:

Jaggard, D. L. (Dwight L.), advisor.

University of Pennsylvania.

Language:

English

Subjects (All):

Penn dissertations--Electrical engineering.

Electrical engineering--Penn dissertations.

Local Subjects:

Penn dissertations--Electrical engineering.

Electrical engineering--Penn dissertations.

Physical Description:

xxv, 176 pages : illustrations ; 29 cm

Production:

1999.

Summary:

In this study, we examine the propagation of guided waves in chirowaveguides with complex geometry. The study is focused on discontinuous structures because these are of potential importance in practical circuit design for both passive and active devices. We concentrate on the development and application of numerical techniques to augment analytical solutions.

First, we report on novel physical effects of semi-leaky waves in planar chirowaveguides. We derive the conditions under which leakage may occur, how large the leakage is, and the physical characteristics of the semi-leaky waves for a dielectric slab with chiral cladding.

Second, we propose, develop and implement an exact numerical method to analyze the effect of discontinuities in open planar chirowaveguides. This method combines the building block approach of multi-mode network theory with a rigorous mode-matching procedure to bring new physical insight to chirowaveguide discontinuities and their effects. Features such as the symmetry properties of the structure are also investigated. Based on our research, numerical results are developed and displayed to demonstrate the usefulness of our approach and to discuss the mode conversion and radiation characteristics of discontinuities.

Third, we provide a comprehensive study of two- and three-dimensional discontinuities in chirowaveguides. The multi-mode coupled-mode method is an effective numerical approach to analyze this problem. After obtaining the coupled-mode equations, we diagonalize the coupling matrix to obtain a multi-mode scattering matrix rather than the usual two-mode approximation. Based on our analysis, numerical and analytical results are displayed to discuss the effects of the chirality admittance and dielectric constant on scattering properties. We also find the relative influence of height and width of chiral obstacles in rectangular waveguides.

Finally, we provide a rigorous mode-matching method combined with multi-mode network theory to analyze the scattering of guided wave in chiral periodic structure. We derive a new orthogonal relation for eigenmodes in a periodic array of chiral slabs to implement mode-matching. Symmetry properties of the structure are also employed to simplify the analysis. Numerical results are given to discuss physical properties for both low and high frequency cases.

Notes:

Supervisor: Dwight L. Jaggard.

Thesis (Ph.D. in Electrical Engineering) -- University of Pennsylvania, 1999.

Includes bibliographical references and index.

Local Notes:

University Microfilms order no.: 99-37793.

OCLC:

187477486