Auto Reconfigurable Patch Antenna for Biomedical Single Channel Multi-Frequency Microwave Radiometry Applications

Abstract

Abstract-A small patch antenna is associated with passive (reactively loaded) elements (varactors) in order to auto adjust the resonant frequency in a single-channel multi-frequency configuration appropriate for biomedical applications. As a supplementary study of the authors in the field of detection of temperature abnormalities in human tissue phantom using microwave radiometry, this paper adds a contribution to frequency readjustment when a shift occur due to the fact that the human body is a complex and stratified dielectric object. The optimization of the array is performed using a Genetic Algorithm (GA) tool as a method of choice. The adjustment in the measurement frequency is performed by altering the values of the passive elements according to the shift needed.

Early breast cancer detection method based on a simulation study of single-channel passive microwave radiometry imaging

“…Next, a single channel microwave radiometer was considered, with an antenna tuned at frequencies with which accounted for electrical field measurements at different depths (11.60, 0.80, 0.62, 0.48, 0.38 cm) in the human body. The weighting coefficient function ( ) was estimated based on a recent work of Nikolopoulos et al [8]. Also, a spherical lesion of varying diameter and location was considered for inducing temperature variations.…”