A Novel design of Antenna for biosensing applications

An antenna-based sensor with novel combinational design of metamaterial and transmission line are proposed for the applications of biosensors. Working at 1.6 GHz resonant frequency, our design aims to reduce the size of antenna biosensor by applying metamaterial structure. The active sensing area of antenna was optimized based on the distribution of electrical field to measure the permittivity and loss tangent of sample by the scattering parameters. The resonant frequency shifts from 1.69 GHz to 1.63 GHz under different concentrations of water-ethanol solutions (3% to 100%) with equivalent permittivity of 79 to 14. According to our results, this antenna biosensor has advantages of small size, lower resonant frequency, real time, label free, sensitive, low profile and easy to integrated with printed circuit boards (PCB) for practical applications.