On the role of antennas in the achievable resolution and accuracy from near-field microwave tomography
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Date
2014-03, 2014-07, 2014-07, 2013-07
Authors
Bayat, Nozhan
Journal Title
Journal ISSN
Volume Title
Publisher
Progress In Electromagnetics Research
IEEE Antenna Technology and Applied Electromagnetics
IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting
IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting
IEEE Antenna Technology and Applied Electromagnetics
IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting
IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting
Abstract
This thesis studies the role of antennas in the achievable resolution and accuracy from nearfield
microwave tomography (MWT). Near-field MWT is an emerging imaging modality in
which the object being imaged is successively irradiated by several antennas, located close
to the object, in the microwave frequency range. The scattered fields emanating from the
object are then processed to form quantitative images from the dielectric properties of the
object.
This thesis starts with proposing a mathematical framework to study the achievable resolution
from MWT. Within this framework, the effect of the near-field distribution of the
utilized antennas on the achievable image resolution will be studied. Specifically, it will be
shown that the use a focused near-field distribution to irradiate the object can enhance the
achievable resolution. Within the same framework, the effects of the frequency of operation,
multiple frequencies of operation, signal-to-noise ratio of the measured data, and the number
of antenna elements on the achievable resolution and accuracy will be studied.
After establishing the importance of the antenna’s incident field distribution, this thesis continues
with investigating two different methods to achieve a focused near-field distribution.
The first method, which attempts to synthesize focused beams from existing omnidirectional
antenna elements, will be shown to be not successful using the method employed in this thesis.
The second method is based on modifying an existing antenna element so as to make its
near-field distribution more focused. Through different experiments and simulations, it will
be shown that the second method can make the near-field distribution of the antenna more
focused while maintaining multiple frequencies of operation for the antenna, and keeping its
physical size reasonably small.
Description
Keywords
Microwave tomography
Citation
The Effect of Antenna Incident Field Distribution on Microwave Tomography Reconstruction
Use of Synthesized Fields in Microwave Tomography Inversion
Small Wide-band Antenna with more Focused Incident Field for increasing the Accuracy and Resolution of Microwave Tomography
On the Effect of Antenna Illumination Patterns on the Accuracy and Resolution of Microwave Tomography
Use of Synthesized Fields in Microwave Tomography Inversion
Small Wide-band Antenna with more Focused Incident Field for increasing the Accuracy and Resolution of Microwave Tomography
On the Effect of Antenna Illumination Patterns on the Accuracy and Resolution of Microwave Tomography