Enhancing Radiation Stability and Image Quality in Periodic Planar Structures: A Characteristic Mode Analysis Approach for Cancer Imaging

This paper shows the potential of applying the characteristic mode analysis (CMA) method in improving the radiation performance and quality factor, etc. of periodic planar antennas. The detection and localization of cancer are critical for healthcare professionals to treat the growing number of cancer cases. Nowadays, radio-frequency systems play an increasingly important role in giving promising solutions for cancer detection. The antenna is considered one of the most important components of the system for obtaining high-resolution medical images. In this way, periodic antenna performances are crucial for new-generation systems to detect cancer. The technique presented in this paper demonstrated that the process of decomposing a planar structure to create a periodic structure surely has more advantages in comparison with a simple metallic planar plate antenna. These advantages are achieved in terms of the resonant frequencies of the radiating modes with a shifting to higher frequencies, improvement in the quality factor, and greater stability in the radiation pattern resulting in high-quality resolutions. On the Other hand, it’s demonstrated that a simple modification of the structure shape of the decomposed antenna by including the slots has a significant impact on the performance of the whole structure, resulting in an increasing number of radiating modes with finite bandwidth.