Low-profile, extremely wideband, dual-band-notched MIMO antenna for UWB applications

Abstract

In this article, an extremely wideband, isolation-enhanced, low-profile “Multiple-Input-Multiple-Output” (MIMO) antenna along with dual-band-notched features has been investigated. The antenna proposed herein, possesses two mutually orthogonal staircase-etched radiators for achieving a wide bandwidth. The radiating elements are placed mutually perpendicular in order to achieve polarization diversity and high isolation, i.e. for minimization of mutual coupling effect between adjacent radiating elements. The antenna exhibits an extremely wide frequency bandwidth covering 1.2–19.4 GHz except two frequency band notches centered at 3.5 and 5.5 GHz, respectively, originated due to the incorporation of a “Rectangular Complementary Split Ring Resonator (RCSRR)” structure and by etching dual “L-shaped” slits in the ground plane. The center frequency of the notched bands is adjusted by fine tuning of the dimensions of the incorporated band-notching structures. Isolation level (S21) better than −20 dB has been obtained due to the insertion of a “T-shaped” parasitic element as a decoupling structure. A prototype of the proposed antenna having dimension of 20 mm × 20 mm (0.08 λo × 0.08 λo) is fabricated and the antenna responses have been measured. Obtained results show that the miniaturized MIMO diversity antenna is undoubtedly a capable contender for communications supporting an extremely wide impedance bandwidth along with band-notched features for WLAN and WiMAX.

A circular monopole antenna for bandwidth enhancement using cylinder slots with triple band notch characteristics

“…The UWB system will become more sophisticated as a result, which will raise the price. An aerial with intrinsic band‐notched performance is described in the literature 6–11 . Many researchers have put forth different strategies for UWB aerial design with band‐notch features to reduce interference, but the disclosed antennas are stiff planar kinds, and these cannot be installed on curved terminals.…”

“…An aerial with intrinsic band-notched performance is described in the literature. [6][7][8][9][10][11] Many researchers have put forth different strategies for UWB aerial design with bandnotch features to reduce interference, but the disclosed antennas are stiff planar kinds, and these cannot be installed on curved terminals. Therefore, antennas offer low mass density and small volume, so the researchers have concentrated…”

Construction of compact two‐port throne‐shaped antenna with dual stopbands and high isolation for Ultrawideband Multiple‐Input Multiple‐Output wireless communication systems

“…Achievement of large bandwidth characteristics at all the ports is required for UWB‐MIMO antennas. Defected ground structure (DGS) changes the aperture of the antenna; thus, it has been proved as a very convenient technique for enhancing the bandwidth in a large amount 1–26 . DGS is also useful to obtain high isolation, 1,15,18,23 miniaturization, 2,6,11 circular polarization, 3 and multiband and wideband performance.…”

“…Hence, designing a compact MIMO antenna with low mutual coupling is highly desirable. Various techniques are discussed in literature for isolation enhancement like neutralization line, 1 orthogonal placement of ports, 2,7,8,11,13,17,[24][25][26] stub on the ground plane, 9,12,13,15,17,20,22 slots cut on the ground plane, 9,10,15,20,21,23 parasitic strips, 11,19,25 fan-shaped parasitic decoupler, 16 and Hilbert fractal-shaped slot on ground plane. 18 Moreover, UWB systems create interference with other applications, e.g., WLAN (5.15-5.85 GHz) and point to point downlink satellite communication (7.5 GHz).…”

“…Thus, band-notched characteristics are also desirable in UWB-MIMO systems. Notch bands at various frequencies can be achieved through stub on the ground plane, 7,11,12,15 split ring resonator (SRR), 8,[23][24][25][26] strips on the ground plane, 9,25 open stub/parasitic strips on radiator, 10,17,21,24 slot on radiators, 11,12 slits on radiator, 14,20 Levy's fractal shaped parasitic strip near the feed line, 18 C-shaped resonator near the feed line, 22 and a via hole. 24 Notch bands also have been achieved through different slots on the patch, including L-shaped 11,22 and Ushaped.…”