Abstract: Disclosed herein are an RF biosensing system, a method of manufacturing an RF biosensor used in the same, and a method of controlling the same. The RF biosensing system allows dementia screening without any painful or uncomfortable procedure through rapid detection of biomarkers for Alzheimer's disease present in a patient's bodily fluids. In addition, the RF biosensing system is very helpful for preventing Alzheimer's disease due to the ability to detect triggers for dementia long before onset of symptoms and easily monitor the progression of Alzheimer's disease using simple and inexpensive equipment.