Miniaturized Pentagon-shaped Planar Monopole Antenna for Ultra-wideband Applications

Abstract

A pentagon-shaped ultra-wideband (UWB) antenna with a high selective notch at the wireless local area network (WLAN) band is presented. An inverted L-shaped stub is incorporated with a pentagon-shaped metallic patch fabricated on an FR4 substrate. Also, a partial ground plane with a slot has been used to achieve UWB operation. Two structures are embedded into a patch to realize a rectangular notch. An electromagnetic band gap (EBG) structure is placed on the opposite side of the patch, and a rectangular complementary split ring resonator (RCSRR) is embedded in the patch. With the coupling of two structures, their notch bands are adjusted to achieve a rectangular notch. The bandwidth, upper and lower frequencies of the notch can be adjusted by varying dimensions of RCSRR and EBG. The measured and simulated results show S 11 ≤ −10 dB for 3.1 GHz-12.5 GHz with a notch at the WLAN band from 5 GHz to 5.91 GHz. Also, the proposed design has a stable radiation pattern and gain with a peak value of 3.5 dB at 9.5 GHz and −6 dB at 5.1 GHz. The miniaturized size of the proposed design (21.5 mm × 27.5 mm × 1.6 mm) with ultra-wide bandwidth makes it suitable for wireless applications.

Ultra-wideband Antenna with Quintuple Band Notches Integrated with Metamaterials

“…To achieve band filtering action in UWB antenna, several methods have been proposed in literature. The slots of different shapes (e.g., U-shaped, fork-shaped, L-shaped, E-shaped or circular slots) and sizes have been cut in patch and ground plane to obtain the filtering characteristics at desired frequencies [8][9][10][11][12][13][14]. In [15], nonuniform width slots are incorporated in rectangular patch to obtain tri-notches at 3.5 GHz, 5.5 GHz, and 8.1 GHz.…”