## 4 Conclusions  
The WBAN technologies have been used for vast applications such as health monitoring and surveillance. Using light, low profile, and low power consumption sensor node, they could usually examine and monitor patient health (such as patient having breast cancer) and then cast the collected data wirelessly. The wearable technologies, which utilized flexible and wearable electronic devices like antennas, usually faced challenges especially when they are integrated and placed next to the human body. They required to be comfortable and robust enough against any sudden movement of body in harsh environment. Regarding the patients having breast cancer, the conformability of the system always was an issue. Besides, at the situation of the COVID-19 taking the patients to hospital proved to be risky for the patients. Therefore, having a wearable imaging device that can monitor the possibility of existing tumour in breast at home will be helpful. One of the important parts of a wearable WBAN device used for health monitoring such as breast cancer is the antenna. This antenna should have broad BW (like UWB antennas) in order to have higher resolution and accuracy in image reconstruction of the tumour in breast. One of the most important challenges during the design process of a wearable UWB antenna is the SAR values. However, to obtain the desired ultra-wide bandwidth, truncated grounds are primarily used in wearable antenna structures, which enhances the SAR value, and it is not desired in wearable antennas. Therefore, a UWB antenna comprising a full ground is designed, simulated, and measured to achieve a broad BW with stable radiation characteristics considering the SAR within the acceptable range according to the standards. The proposed antenna is designed on a denim substrate, with a thickness of 0.7 mm and \(\varepsilon_{r}=1.4\), and a ShieldIt conductive textile, with thickness of 0.17 mm (total dimensions of 60 \(\times\) 50 \(\times\) 0.7 mm\({}^{3}\)). The antenna was fed through a SIW transition and GCPW. The proposed antenna achieved an impedance BW of 7-28 GHz, maximum directive gain of 10.5 dBi, and maximum radiation efficiency of 96%. After investigating the antenna's performance in free space, its radiation characteristics are examined in a new media as breast to detect a tumour in different considerations such as central tumour with and without skin, and multiple tumours (two and three) within the breast. The reconstructed images proved that the antenna can be an acceptable candidate with high performances working on a media like a breast and later as part of a wearable WBAN system for breast cancer monitoring and imaging. S.N.M., designed, simulated, performed the experiments, wrote the required programs, and wrote a complete draft of the paper. T.S. and A.J., supervised, evaluated, and edited the paper. A.J.I. and A.C.S., supervised the project and secured the funding for the project. Q.H.A. and M.A.I, edited the paper and helped in data collection and evaluation. All authors have read and agreed to the published version of the manuscript. This research was supported by Universiti Putra Malaysia through Putra Grant (GP/2018/9606000). We also want to thank the Department of Electrical and Electronic Engineering of Universiti Putra Malaysia for funding this research work. The authors declare no conflict of interest. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Ref No.**} & **Dimensions** & \multirow{2}{*}{**BW (GHz)**} & **Max Efficiency** & **Max Gain** & **Feeding** & \multirow{2}{*}{**Min SAR**} \\  & **(mm)** & & **(\%)** & & **(dBi)** & **Method** & \\ \hline
[50] & 48 \(\times\) 39 & 2.7–10.62 & - & 1.8 & CPW & - \\
[49] & 80 \(\times\) 67 & 3.7–10.3 & \textless{}60 & 4.53 & Full GND & 0.09 \\
[51] & 50 \(\times\) 45 & 2.3–16 & 85 & 8 & CPW & 0.1 \\
[52] & 54 \(\times\) 54 & 2–12 & - & - & TL & 0.113 \\
[53] & 60 \(\times\) 60 & 2–15 & 95 & 4 & TL & - \\ Proposed & 60 \(\times\) 50 & 7–28 & 96 & 10.5 & SIW-GCPW & 0.09 \\ \hline \hline \end{tabular}
\end{table}