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International Journal of Antennas and Propagation
Volume 2015, Article ID 751739, 8 pages
Research Article

A Directional Antenna in a Matching Liquid for Microwave Radar Imaging

1Department of Electrical and Computer Engineering, University of South Alabama, Mobile, AL 36688, USA
2Department of Physics and Astronomy, University of Manitoba, 301 Allen Building, Winnipeg, MB, Canada R3T 2N2
3CancerCare Manitoba, 675 McDermot Avenue, Winnipeg, MB, Canada R3E 0V9
4Biomedical Engineering Program, University of Manitoba, E2-390 EITC, Winnipeg, MB, Canada R3T 5V6
5Department of Electrical and Computer Engineering, University of Manitoba, E2-390 EITC, Winnipeg, MB, Canada R3T 5V6

Received 19 December 2014; Revised 15 October 2015; Accepted 19 October 2015

Academic Editor: Muhammad Ramlee Kamarudin

Copyright © 2015 Saeed I. Latif et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The detailed design equations and antenna parameters for a directional antenna for breast imaging are presented in this paper. The antenna was designed so that it could be immersed in canola oil to achieve efficient coupling of the electromagnetic energy to the breast tissue. Ridges were used in the horn antenna to increase the operating bandwidth. The antenna has an exponentially tapered section for impedance matching. The double-ridged horn antenna has a wideband performance from 1.5 GHz to 5 GHz (3.75 GHz or 110% of impedance bandwidth), which is suitable for breast microwave radar imaging. The fabricated antenna was tested and compared with simulated results, and similar bandwidths were obtained. Experiments were conducted on breast phantoms using these antennas, to detect a simulated breast lesion. The reconstructed image from the experiments shows distinguishable tumor responses indicating promising results for successful breast cancer detection.