Miniaturized and Wide-Range Microwave-Permittivity Sensor Based on Electromagnetic-Induced Transparency

In this paper, we had designed a microwave band permittivity sensor based on analog electromagnetic-induced transparency (A-EIT). By comparing the S-parameter changes of the tested sample before and after measurement, we can calculate the permittivity of the tested sample then distinguish material types with similar appearances. The transmission line had used impedance transformation structure, and the open circuit branch is vertically connected to the transmission line. The open circuit branch will have a coupling effect with the spiral cross structure and can also simulate the A-EIT phenomenon. The above design has potential applications in the miniaturization of sensors.