Graphene based Microwave Sensor for Determining Dielectric Permittivity of Different Materials for Food Evaluation Application

In this work single port graphene based planar microwave sensor is presented for characterizing dielectric permittivity of different materials. The proposed rectangular microstrip antenna sensor operated at 4.81 GHz having overall physical size 7 x 5 mm
²
printed on flexible FR-4 substrate with relative permittivity (ϵr) = 4.4 and thickness 0.4mm, covering the bandwidth of 1562 MHz. The miniaturized antenna sensor investigates the relationship between dielectric permittivity and resonant frequency for different dielectric materials to employ proposed antenna sensor in food quality assessment effectively. Also, the proposed antenna-based sensor has potential to be utilized in various other industries such as agriculture, biomedical and pharmaceuticals for future endeavour.