Broadband Wireless Sensing System for Non-Invasive Testing of Biological Samples

Wireless RF sensors are the building blocks of the next generation sensing techniques that are quite essential for the Internet of Things. In this paper, the RF system comprising of ultra-wideband transmitter-receiver antenna and highly sensitive planar sensor is proposed for wireless sensing of glucose and saline concentration, which are currently being used in various biomedical applications. The proposed wireless sensor technique is quite cost-effective having both antennae and the sensor fabricated on economical FR4 substrate, where the ultra-wide band antennas are operational in 1-18 GHz with highest gain of 7 dBi. The wireless sensor of the proposed RF system possessing high sensitivity of 60 MHz per unit change in dielectric constant of liquid sample are operating over broad frequency range of 1.5 to 5.9 GHz. The sensors are designed, fabricated, and tested for characterizing various biomedically relevant samples: saline and glucose solutions at various concentrations. Our results show that the proposed wireless sensing system possesses strong potential for biomedical applications.