# Planar UWB Monopole Antenna with Tri-Band Rejection Characteristics at 3.5/5.5/8 GHz
## 6 Conclusions  
A planar UWB monopole antenna with triple band-notched function at 3.5/5.5/8 GHz is presented in this paper. The low frequency notched band was formed by an arc H-shaped slot on the radiating patch. The other two notched bands were formed by cutting the narrow slots on the ground plane. The presented antenna can avoid the interference from WLAN, WiMAX, and X- band satellite systems. The results of the return loss showed the desired band rejection property. Nearly omnidirectional radiation patterns and desirable gain are also presented to verify the satisfactory performance of the presented antenna.  
**Author Contributions:** [PERSON] and [PERSON] made substantial contributions to the design, analysis, and optimization of the antenna. Additionally, they wrote and revised the paper. [PERSON] contributed to the experimental measurement and data analysis.  
**Funding:** This work was supported in part by the National Natural Science Foundation of China under Grant No. 61801521, in part by the Natural Science Foundation of Hunan Province under Grant No. 2018 JJ2533, in part by the Fundamental Research Funds for the Central Universities of Central South University under Grant No. 2017 gczd001 and Grant No. 2018 zzts534.  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Reference** & **Size (mm)** & **Notched Band (GHz)** & **Remarks** \\ \hline
[18] & \(70\times 80\) & \
\begin{tabular}{c} 2.4–2.5, \\ 4.0–6.0, \\ 8.0–8.5 \\ \end{tabular} &
\begin{tabular}{c} Antenna had three notched bands, but size was \\ too large, and it did not reject WiMAX band \\ \end{tabular} \\ \hline
[19] & \(24\times 35\) & \
\begin{tabular}{c} 3.4–4.15, \\ 5.3–6.2, \\ 6.8–7.7 \\ \end{tabular} &
\begin{tabular}{c} Antenna had three notched bands, but it did \\ not reject complete WiMAX band and complete \\ WLAN band \\ \end{tabular} \\ \hline
[20] & \(28\times 30\) & \
\begin{tabular}{c} 3.3–3.6, \\ 4.5–4.7, \\ 5.15–5.35, \\ 5.7–5.825 \\ \end{tabular} &
\begin{tabular}{c} Antenna had four notched bands, but it did not \\ reject the band for X-band satellite applications \\ operating near 8 GHz \\ \end{tabular} \\ \hline
[22] & \(35\times 35\) & \
\begin{tabular}{c} 2.95–3.72, \\ 5.12–6.07, \\ 8.04–8.65 \\ \end{tabular} &
\begin{tabular}{c} Antenna had three notched bands, but it had a \\ larger size \\ \end{tabular} \\ \hline
[23] & \(36.6\times 26\) & \
\begin{tabular}{c} 3.36–3.75, \\ 5.15–6.0, \\ 7.07–8.7 \\ \end{tabular} &
\begin{tabular}{c} Antenna had three notched bands, but it did \\ not reject complete WiMAX band \\ \end{tabular} \\ \hline
[24] & \(30\times 30\) & \
\begin{tabular}{c} 3.3–3.7, \\ 5.15–5.825, \\ 7.25–7.475 \\ \end{tabular} &
\begin{tabular}{c} Antenna had three notched bands, but it did \\ not reject the band for X-band satellite \\ applications operating near 8 GHz \\ \end{tabular} \\ \hline
[25] & \(27\times 30.5\) & \begin{tabular}{c} 3.36–3.88, \\ 4.96–6.23, \\ 7.9–8.7 \\ \end{tabular} & \begin{tabular}{c} Antenna had three notched bands, but it did \\ not reject complete WiMAX band \\ \end{tabular} \\ \hline This Work & \(35.5\times 30\) & \
\begin{tabular}{c} 2.59–4.01, \\ 4.73–6.11, \\ 7.68–8.40 \\ \end{tabular} &
\begin{tabular}{c} Antenna had three notched bands, and rejected \\ complete WiMAX band, complete WLAN band \\ and the band for X-band satellite applications \\ operating near 8 GHz \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table}
Table 3: Comparison between proposed and reported UWB antennas with band-notched function.