## 5 Conclusions  
The paper concerns research on how different positions of the ARCM of a wearable WIT device near the body (near the head, arm, forearm, and chest) affect the parameters of the EMR emissions (antenna operating parameters) and the related SAR in a body adjacent to the ARCM, caused by the absorption of EMR emitted from the antenna. The results are discussed using models and exposure scenarios relevant to a wearable device worn on or near the body, operating with a 2.45 GHz ISM band antenna (i.e., 2.400-2.483 GHz band used, for example, in Wi-Fi 2G and Bluetooth applications). Regarding devices compared at a fixed antenna input power, it was shown that in the considered APD and CWED exposure scenarios, the 10g-SAR compliance demonstrated for the ARCM at any of the considered locations near the body may also confirm compliance for other locations. This is the case, even when compliance is demonstrated using the most simplified [S] models, such as the arm or forearm (the obtained variability in 10g-SAR values did not exceed the standard uncertainty of the applied numerical simulations in such cases). The use of simplified [S] models of human body parts for these purposes has also been shown to be sufficient. The applicability of simplified [S] models (e.g., multi-layer) allows for the development of twin physical phantoms on the basis of the considered numerical models. These can then be easily used in experimental studies (e.g., regarding MW imaging and sensing, wireless implantable devices, WBAN, etc.). Regarding devices compared at a fixed eirp emitted from the antenna: in the considered APD and CWED exposure scenarios, the evaluation and assessment of antenna parameters (especially antenna gain with up to 5 times relative difference in values expressed on a linear scale between the considered exposure scenarios) and 10g-SAR (with up to 5 times relative difference) should be carried out on a case-by-case basis. Otherwise, it may lead to incorrect conclusions regarding the optimization of the functionality of a wearable WIT device design, or to overestimating the 10g-SAR values (conservative evaluation of the electromagnetic impact) in exposure scenarios with an EMR source located up to a few millimeters from the body. Furthermore, performing such analyses regarding the ARCM positions near body sections of a very complex and irregular structure (e.g., the head) requires the use of anatomical [A] models of a human body. The analysis of the considered exposure cases and models gives the conclusions mentioned above. However, to gain a deeper understanding of the discussed potential equivalence of using simplified [S] or anatomical [A] body models, future research should explore the use of other body models (especially those of people with significantly differentBMIs, i.e., different amounts of subcutaneous fat tissue), other exposure scenarios, ARCHAs designed for free space emitting EMR at frequencies other than 2.45 GHz, or other ARCM substrate materials (especially for disposable ARCHAs in the form of adhesive patches). Conceptualization, P.Z., J.K. and K.G. ; methodology, P.Z., J.K. and K.G. ; validation, P.Z. and K.G. ; formal analysis, P.Z. and J.K.; investigation, P.Z., J.K. and K.G. ; resources, K.G. ; data curation, P.Z. and K.G. ; writing--original draft preparation, P.Z. and J.K.; writing--review and editing, P.Z. and J.K.; visualization, P.Z. ; supervision, J.K.; project administration, P.Z. All authors have read and agreed to the published version of the manuscript. The results of research funded by the National Centre for Research and Development (Warszawa, Poland), agreement no. DWP/PNiWP/VI/2023, task no. : LIPN.04: Optimization of the Configuration of Selected Industrial Systems Using Radiotherapy Links for Energy or Information Transfer in the Context of Their Interaction with the Human Body (Using ComputerModeling). Not applicable. The original contributions presented in this study are included in the article. Further inquiries can be directed to the corresponding author.