The detection of branded and unbranded chemical materials is essential for the quality control assessment. In this work, a metamaterial inspired sensor is designed and fabricated, which incorporates oval-shaped wing resonators, in order to use to detect branded and unbranded diesels in the X-band frequency region. The simulation studies were carried out by using the Computer Simulation Technology (CST) Microwave studio. A transmission line was introduced into the sensor design and genetic algorithm was used to optimize the proposed structure. Parametric study was investigated by changing the permittivity, permeability of the sensor layer, width of the transmission line, materials of the substrate layer, and width of the resonator. Results showed that different factors can be considered to sense the chemical materials including the shift in resonant frequency and amplitude variation in the reflection or transmission spectrum. It was found that the sensible variation in the transmission value is about −3.2 dB, which is superior to that reported in literature. It was concluded that the sensor is highly sensitive to distinguish the branded diesel from the unbranded one, which makes it viable for detecting fluidics in the chemical industry and medicine.

An environment-friendly and cost-effective method to deal with electromagnetic pollution is fabricating porous carbon from biomass as a raw material with a simple technique. The purpose of this research is to create porous carbon from mango peel biomass for optimizing microwave absorption. The resulting porous carbon (PC) has the potential to be an effective microwave absorber. Scanning Electron Microscopy (SEM) depictions also revealed the porous carbon with homogeneous shapes and uniform size distribution. Complex permittivity studies were performed to evaluate their microwave absorption capabilities, resulting in a high reflection loss of −50.2 dB at a thickness of 2.1 mm and an effective absorption bandwidth (EAB) of 3.39 GHz for the sample carbonized at 800 °C. The exceptional microwave absorption ability of porous carbon (PC) can be attributed to its effective impedance matching and consequent attenuation of microwaves through dielectric loss. This research introduces a novel biomass source, readily available in nature, which can be easily processed to enhance microwave absorption properties.