Design and investigation of a multi-functional antenna with variable wideband/notched UWB behavior for WLAN/X-band/UWB and Ku-band applications

Abstract

In this article, a novel wideband/band-notched UWB antenna with multi-functional behavior is presented. The proposed antenna consists of a rectangular metallic part which formed the patch and a partial ground plane. A novel open loop resonator is loaded at the top side of the patch for the purpose of bandwidth improvement and to create band notched mechanism. The antenna occupies a tiny size of just 0.25 λo * 0.24 λo. The proposed antenna provides dual modes of operation. The first mode represents a wideband antenna with a usable impedance bandwidth (S11 < −10 dB) from 4.4 GHz to 14.7 GHz (107.8%). For the second mode, a massive usable impedance bandwidth from 2.9 GHz to 14.3 GHz (132.5%) with dual notched bands was obtained. The presence of dual notched bands eliminates the interference with Wi-MAX (IEEE 802.16) from 3.30 GHz to 3.80 GHz, the extended C-band satellite (downlink) system from 3.7 GHz to 4.2 GHz, WLAN (IEEE 802.11 a/h/j/n) from 5.15 GHz to 5.825 GHz, and DSRC (IEEE 802.11p) from 5.50 GHz to 5.925 GHz. Compared to the lately reported papers, the notches were achieved using a single structure, prompting to decrease the intricacy of the work. A very well agreement between simulated and measured results was accomplished confirming that the antenna has the ability of multi-functional operation.