# Enhancement of Feed Source through Three Dimensional Printing
## 4 Result and Discussion
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**Frequency** **(GHz)**} & **Simulated,** **Directivity** & **Simulated,** **Gain** & **Measured,** **Onevitory** & **Measured,** **Gain** & **Simulated,** **Onevitory** & **Simulated,** **Gain** & **Measured,** **Onevitory** & **Measured,** **Gain** \\  & **Only Horn** & **Only Horn** & **Only Horn** & **Only Horn** & **with** & **with** & **with** & **with** & **with** \\  & **(dBi)** & **(dBi)** & **(dBi)** & **(dBi)** & **Prototype** & **Prototype** & **Prototype** & **Prototype** \\  & & & & & & **(dBi)** & **(dBi)** & **(dBi)** \\ \hline
10 & 18.886 & 18.841 & 18.900 & 18.945 & 20.500 & 19.700 & 21.168 & 20.869 \\ \hline
10.5 & 19.458 & 19.430 & 19.500 & 19.528 & 21.800 & 21.100 & 20.978 & 20.532 \\ \hline
11 & 19.698 & 19.702 & 19.600 & 19.596 & 22.000 & 21.600 & 23.109 & 22.942 \\ \hline
11.5 & 20.028 & 19.994 & 20.100 & 20.134 & 21.700 & 21.400 & 22.393 & 22.128 \\ \hline
12 & 20.489 & 20.463 & 20.310 & 20.335 & 22.100 & 21.900 & 23.372 & 23.007 \\ \hline
12.5 & 20.687 & 20.673 & 20.500 & 20.514 & 22.600 & 22.300 & 23.505 & 23.151 \\ \hline
13 & 21.025 & 20.976 & 21.010 & 21.060 & 22.500 & 22.300 & 22.839 & 22.645 \\ \hline
13.5 & 21.255 & 21.228 & 21.100 & 21.128 & 23.000 & 22.800 & 23.87 & 23.305 \\ \hline
14 & 21.480 & 21.452 & 21.400 & 21.428 & 23.400 & 23.000 & 23.875 & 23.432 \\ \hline
14.5 & 21.759 & 21.721 & 21.800 & 21.838 & 23.200 & 22.600 & 23.319 & 22.795 \\ \hline
15 & 21.956 & 21.927 & 21.900 & 21.930 & 22.200 & 21.200 & 23.558 & 22.524 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Comparison of measured and simulated values with and without proposed prototype. The observed radiation patterns of the overall system are depicted in Figure 9, highlighting the narrow beamwidth and lower side lobe levels in 10, 11, 12, 13, 14 and 15 GHz frequencies as noted in E- and H- planes, respectively. In E- and H- planes, the noted side lobe levels are \(-\)12.4, \(-\)11.8, \(-\)12.4, \(-\)12.4, \(-\)12. \(-\)11.7, \(-\)11.4 dB and \(-\)27.7, \(-\)29.9, \(-\)26.5, \(-\)26.5, \(-\)25.6, \(-\)29.1 dB with the horn-only case, as compared against \(-\)15, \(-\)18, \(-\)17.5, \(-\)15.7, \(-\)19.1, \(-\)10.4 dB and \(-\)12.9, \(-\)15, \(-\)15.5, \(-\)18.8, \(-\)14, \(-\)12.6 dB with the proposed WBP surface placed above the horn feed source. In the condition with the horn-only case, in the H-plane of frequencies 10, 11, 12, 13, 14, and 15 GHz simulated directivities are 18.9, 19.7, 20.5, 21, 21.5 and 22 dBi; simulated gains are 18.8, 19.7, 20.5, 21, 21.5 and 21.9 dBi; 3 dB angular widths are 21.4\({}^{\circ}\), 19.2\({}^{\circ}\), 17.6\({}^{\circ}\), 16.5\({}^{\circ}\), 15.4\({}^{\circ}\) and 14.6\({}^{\circ}\); side lobe levels are \(-\)25.8, \(-\)30.7, \(-\)31.1, \(-\)26.5, \(-\)27.6 and \(-\)29.1 dB. Similarly, in the E-plane of frequencies, the 3 dB angular widths are 20.1\({}^{\circ}\), 18.5\({}^{\circ}\), 16.5\({}^{\circ}\), 15.4\({}^{\circ}\), 14.5\({}^{\circ}\), and 13.6\({}^{\circ}\); side lobe levels are \(-\)12.2, \(-\)12.4, \(-\)12, \(-\)12, \(-\)11.7, and \(-\)11.4 dB over the operating frequency range. Additionally, an improvement in the characteristics plots was observed with the WBP structure placed above the feed horn source. In the condition with the WBP and horn source, for the H-plane of frequencies 10, 11, 12, 13, 14, and 15 GHz simulated directivities and gains are 20.5, 22, 22.1, 22.5, 23.4 and 22.2 dBi; 19.7, 21.6, 21.9, 22.3, 23 and 21.2 dBi; 3 dB angular widths are 16.2\({}^{\circ}\), 14.3\({}^{\circ}\), 15.8\({}^{\circ}\), 13.4\({}^{\circ}\), 12.9\({}^{\circ}\), and 13\({}^{\circ}\); side lobe levels are \(-\)12.9, \(-\)15, \(-\)15.5, \(-\)18.8, \(-\)14, and \(-\)12.6 dB. In E-plane of frequencies 10, 11, 12, 13, 14 and 15 GHz, 3 dB Angular width are 14.9\({}^{\circ}\), 13.9\({}^{\circ}\), 12.3\({}^{\circ}\), 11.8\({}^{\circ}\), 10.8\({}^{\circ}\), and 9.8\({}^{\circ}\); side lobe levels are \(-\)15., \(-\)18, \(-\)17.5, \(-\)15.7, \(-\)19.1, and \(-\)10.4 dB.