On the role of antennas in the achievable resolution and accuracy from near-field microwave tomography
| dc.contributor.author | Bayat, Nozhan | |
| dc.contributor.examiningcommittee | Bridges, Gregory (Electrical and Computer Engineering) Regehr, Jonathan (Civil Engineering) | en_US |
| dc.contributor.supervisor | Mojabi, Puyan (Electrical and Computer Engineering) | en_US |
| dc.date.accessioned | 2014-08-27T19:30:01Z | |
| dc.date.available | 2014-08-27T19:30:01Z | |
| dc.date.issued | 2014-03 | en_US |
| dc.date.issued | 2014-07 | en_US |
| dc.date.issued | 2014-07 | en_US |
| dc.date.issued | 2013-07 | en_US |
| dc.degree.discipline | Electrical and Computer Engineering | en_US |
| dc.degree.level | Master of Science (M.Sc.) | en_US |
| dc.description.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. | en_US |
| dc.description.note | October 2014 | en_US |
| dc.identifier.citation | The Effect of Antenna Incident Field Distribution on Microwave Tomography Reconstruction | en_US |
| dc.identifier.citation | Use of Synthesized Fields in Microwave Tomography Inversion | en_US |
| dc.identifier.citation | Small Wide-band Antenna with more Focused Incident Field for increasing the Accuracy and Resolution of Microwave Tomography | en_US |
| dc.identifier.citation | On the Effect of Antenna Illumination Patterns on the Accuracy and Resolution of Microwave Tomography | en_US |
| dc.identifier.uri | http://hdl.handle.net/1993/23906 | |
| dc.language.iso | eng | en_US |
| dc.publisher | Progress In Electromagnetics Research | en_US |
| dc.publisher | IEEE Antenna Technology and Applied Electromagnetics | en_US |
| dc.publisher | IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting | en_US |
| dc.publisher | IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting | en_US |
| dc.rights | open access | en_US |
| dc.subject | Microwave tomography | en_US |
| dc.title | On the role of antennas in the achievable resolution and accuracy from near-field microwave tomography | en_US |
| dc.type | master thesis | en_US |