Designing and analyzing a modern MIMO‐UWB antenna with a novel stub for stop band characteristics and reduced mutual coupling

Abstract

A dual notched band MIMO‐UWB antenna is presented in this article. High isolation between radiating elements is achieved with novel elliptical T‐shape stub and dual bands are notched with the help of a novel G‐shape stub; extended from ground plan. The proposed antenna is resonates between 3 and 11 GHz. The size of antenna is 18 × 36 × 1.6 mm3. The antenna is evaluated in term of isolation, envelope correlation coefficient, gain, efficiency, current distribution, and radiation pattern.

Design and Analysis of a Compact Uwb-Mimo Antenna With Four Notched Bands

“…It is a big challenge to design a compact UWB-MIMO antenna which can be applied to portable wireless systems, as closely spaced radiators cause high mutual coupling. Some decoupling technologies have also been reported in [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32], such as a hybrid method of CSRR and ground stubs in [14], THlike parasitic structure in [15], defected ground structure (DGS) in [16], neutralization line in [17], polarization diversity in [18], connected ground system in [19], and multi-slot isolator in [20]. The UWB-MIMO antennas in [21][22][23][24][25][26][27][28][29][30][31][32] offered multiple NBs.…”

“…Some decoupling technologies have also been reported in [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32], such as a hybrid method of CSRR and ground stubs in [14], THlike parasitic structure in [15], defected ground structure (DGS) in [16], neutralization line in [17], polarization diversity in [18], connected ground system in [19], and multi-slot isolator in [20]. The UWB-MIMO antennas in [21][22][23][24][25][26][27][28][29][30][31][32] offered multiple NBs. In [21], an H-shaped slot was curved in ground plane to improve port isolation, and an open stub was etched on radiator to avoid 5.5 GHz band.…”

“…With trident-shape metal strips, 5.7 GHz band and 8 GHz band were stopped. In [26], an elliptical T-shape stub helped diminish MC, and a G-shape stub made dual notched bands. In [27] and [28], dual NBs were achieved by inserting two L-shaped slits, and −22 dB isolation was obtained by L-shaped ground plane in [27].…”

Miniaturized MIMO Antenna with Low Inter-radiator Transmittance and Band Rejection Features

“…Various techniques have been used to reduce mutual coupling, such as decupling stubs, electromagnetic band gaps (EBG), split ring resonators, LC resonance, and suspended lines [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

“…In [20], the authors designed a circular-shaped MIMO antenna with EBG structure for isolation, where the overall dimension of the antenna was 27.2 mm × 46 mm, the isolation was greater than 18 dB and the ECC was less than 0.018. In the study by Khan and Khattak [21], the authors proposed a MIMO antenna with a T-shaped decoupling stub and dual-stop band of WiMAX and WLAN; the dimension of the antenna was 18 mm × 36 mm, the isolation was greater than 20 dB and the ECC was less than 0.05. Overall, the above designs are large in size, have low isolation and add additional complexity to the antenna structures.…”