This paper presents a wideband cavity backed antenna for continuous brain temperature monitoring through passive microwave radiometry. The proposed antenna has a diameter of 20 mm and height of 4.56 mm operating between 2.723-5.032 GHz. The antenna structure consists of a triple slotted square patch with hexagonal shape that is matched to a human head phantom. The SAR analysis shows that the antenna is capable of receiving microwave energy from deep brain and as an enabling component, it is suitable for a wearable brain temperature sensing system.
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