A biosensor system including a biosensor patch and an interrogation device. The biosensor patch includes an open circuit self-resonating pattern for passively generating a response signal when excited by an interrogation signal. The response signal may have a frequency amplitude, phase, and bandwidth that may change according to an electro-magnetic response of a biological component of a user. The interrogation device transmits an interrogation signal to the biosensor patch and receives the response signal in return. The interrogation device may run an application for decoding and analyzing the response signal to generate data corresponding to the health of the biological component.