Abstract-This paper presents a microwave imaging method for malignant tumors using flanged parallel-plate waveguide probes, based on detecting the significant difference in complex permittivity that exists between the tumor and its surrounding tissues. The presence of a tumor is identified from a frequency scan of the resonant scattering parameters. The tumor location can be estimated using S 21 obtained at various positions of the region of concern, e.g., human organ, biological tissues, etc., while another probe transmits at the position yielding maximum resonating response of S 11 , with triangulation technique. A tumor can also be distinguished from clutter items. With specific reference to the detection of breast cancer, simulation studies are presented to verify the performance of this probe and the proposed detection technique.

Abstract-This paper presents an experimental study of a flanged parallel-plate dielectric waveguide (PPDW) probe for detecting dielectric inclusions in a dielectric host medium, with different electrical properties from the inclusions. The S-parameter signals from an inclusion (modelled as a conducting sphere) are shown to have resonant characteristics, from which the size and location of the inclusion can be deduced. As an example of a possible application for this technique, we use parameters of host medium and inclusions relevant for detection of tumors in body tissues. An experimental study was performed on solid tissue-simulating phantoms with embedded conducting dielectric inclusions. The measurements show promising results.