## 1 Introduction
The highly demanding requirements of the experimental measurement method lead to extreme difficulties in practice, but the experimental results are more objective and can better reflect real scenarios compared to theoretical dosimetry. Some current examples of experimental dosimetry include: Instilling fluid that simulates brain water content into a human brain model to study the effect of cell-phone radiation on the brain; instilling fluid that simulates muscle water content into an anthropomorphic phantom for electromagnetic experiment in an effort to determine the relation of radiation frequency and interaction depth of an electromagnetic wave, confirming the distribution characteristics of electromagnetic radiation under different frequencies in tissues of an evenly-distributed anthropomorphic phantom for electromagnetic experiment. When measuring SAR in an electromagnetic experiment with an anthropomorphic phantom, an essential requirement is to ensure the consistency of the electromagnetic parameters (permittivity and conductivity) of a simulated body liquid and those of the actual tissue being substituted as well as possible (general acceptable levels \(\leq\)\(\pm\)5%). However, in real scenarios, the human body consists of nonhomogeneous dispersive media, which means, its electromagnetic parameters are piecewise functions of frequency. Therefore, it is necessary to use simulated body liquid with dielectric properties corresponding to a specific frequency when measuring SAR under different frequencies to align with the real electromagnetic characteristics of bio-tissue. In the telecommunication sector, most communication gadgets have fixed working frequencies (e.g., 900 MHz, 1800 MHz, 1900 MHz etc. are designated for GSM phone) [9]. Therefore, studying electromagnetic parameters of bio-tissue at a fixed frequency point is adequate. Research on the effect of electromagnetic radiation from a cell-phone on the human brain has been on the rise, corresponding with the rapid prevalence of mobile phone use since the end of the last century. Driven by concerns about human health, these studies occasionally managed to attract close attention from academics worldwide, and keep advancing to date. Facts established by the research results, in addition to people's worries, finally translated to the introduction of standards regarding the regulation of radiation in mobile phone manufacturing within the telecommunication sector. Research touching on the biological effects on the human body induced by electromagnetic radiation energy from medical devices began to draw recognition from scholars of many countries. However, only preliminary explorations have been carried out [10; 11]. Due to the lack of corresponding studies on electromagnetic exposure levels to serve as basic guidance, in addition to the fact that electromagnetic waves are invisible, odorless, and tasteless, people are unaware when ambient electromagnetic radiation exceeds the endurance capacity of the human body until health consequences occur. As a result, the incidence rate of patients and medical workers falling victim to electromagnetic exposure has significantly increased. When experimenting with medical devices in real scenarios, due attention shall be paid to the fact that the research emphasis of the telecommunication sector differs greatly from that of the medical device sector, with the main examples as follows: (a) Considering that the working frequencies of medical devices are discretely distributed due to the fact that the intended purpose and the radiation mechanism differ, it is necessary to study the theoretical and actual distributions of full-band electromagnetic parameters in different human tissues for better measurement of SAR; (b) radiation in the brain is the focus of the majority of research conducted in the telecommunication sector, while the target areas of radiation from medical devices can be multiple parts of the human body. Additionally, in the case of an implanted device, internal exposure is also a possibility.