Compact Hexagon open Slot Inverted-$L$ Shaped Printed Monopole Antenna for UWB Communications

In this paper a compact hexagon open slot inverted
$L$
- shaped printed monopole (CHSILPM) ultrawideband (UWB) antenna is presented. The proposed CHSILPM UWB antenna of size
$25\times 25\times 1.6\ \text{mm}^{3}$
is fabricated on FR4 substrate (
$\varepsilon_{\mathrm{r}}=4.4$
and loss tangent = 0.025). The hexagon slot-based ground plane of proposed CHSILPM UWB antenna is fed by
$50 \Omega$
microstrip feed line. The hexagon slot is transformed into an open slot and a S-shaped stub is loaded at one of the end of open hexagon slot to enhance the impedance bandwidth of proposed antenna. The reported antenna has achieved −10 dB impedance bandwidth (IBW) of 110.5% (3.01 - 10.41 GHz) and realized gain 4.1, 4.3 and 4.4dBi at 4.2, 5.5 and 8.5 GHz respectively with bi-directional radiation pattern.