Scholarly
    Communications Project


Document Type:Master's Thesis
Name:James Matthew Monkevich
Email address:jmonkevi@vt.edu
URN:1998/00524
Title:Analysis of Aperture Radiation Using Computer Visualization and Image-Processing Techniques
Degree:Master of Science
Department:Electrical and Computer Engineering
Committee Chair: Dr. Ioannis M. Besieris
Chair's email:besieris@vt.edu
Committee Members:Dr. Sedki M. Riad
Dr. Wayne A. Scales
Keywords:visualization, computational electromagnetics, image-processing, antennas
Date of defense:May 4, 1998
Availability:Release the entire work immediately worldwide.

Abstract:

In order to accurately describe the behavior of an antenna, one needs to understand the radiation mechanisms that govern its operation. One way to gain such an insight is to view the fields and currents present on a radiating structure. Unfortunately, in close proximity to an antenna empirical techniques fail because the measurement probe alters the operation of the radiating structure. Computational methods offer a solution to this problem. By simulating the operation of an antenna, one can obtain electromagnetic field data near (or even internal to) a radiating structure. However, these computationally intense techniques often generate extremely large data sets that cannot be adequately interpreted using traditional graphical approaches.

A visualization capability is developed that allows an analysis of the above-mentioned data sets. With this technique, the data is viewed from a unique, global perspective. This format is well suited for analytical investigations as well as debugging during modeling and simulation. An illustrative example is provided in the context of a rectangular microstrip patch antenna. A comparison is performed between the visualized data and the theory of operation for the microstrip patch in order to demonstrate that radiation mechanisms can be obtained visually.

An additional analysis tool is developed using Gabor filters and image-processing techniques. This tool allows one to detect and filter electromagnetic waves propagating with different velocities (both speed and direction). By doing so, each mode of an antenna can be analyzed independently. The fields of a multi-moded, open-ended rectangular waveguide are analyzed in order to demonstrate the effectiveness of these techniques.


List of Attached Files

ch1.pdf ch2.pdf ch3.pdf
ch4.pdf ch5.pdf ch6.pdf
etd.pdf fig3_09.mov fig3_10.mov
fig3_11.mov fig3_12.mov fig5_06.mov
fig5_07.mov fig5_08.mov fig5_11.mov
fig5_12.mov refs.pdf vita.pdf


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