Wide-band Meta-surface Antenna for Microwave Brain Imaging systems

In this article, we present a broadband two-layer Meta-surface Antenna (MS) to use in Microwave brain imaging systems. The antenna element consists of an H-shaped slot antenna as a radiator and rectangular unites Meta-surface. The radiator is designed on a double side of FR4 substrate comprised of a ground plane with an H-shaped slot and the feed line radiator on top with a stub. The analysis of the operation frequency of the proposed meta-surface antennae is between 0.9- 2.7 GHz that a lower frequency supports the penetration amount of electromagnetic into tissues and the higher frequency support to obtain a high spatial resolution in the imaging algorithms. We have designed an MS antenna and optimized it inside the coupling medium. Due to the higher reflection of the electromagnetic wave from head tissues, the resonance frequency of the adjacent meta-surface antenna to the head is affected. Because of the coupling medium, reflections will be decreased and penetration of the incident wave will be increased. Furthermore, Specific Absorption Rate (SAR) is investigated in the simulation environment with 0.6 W/kg in the 1.5GHz has obtained. Also, the simulated near-field radiation pattern of the proposed antenna near the brain tissues shows that the proposed MS antenna supports the Microwave Imaging (MWI) agreements. Thus proposed MS antenna can be a good candidate for brain stroke detection.