Design of a compact UWB MIMO‐diversity antenna incorporating fractal inspired isolation structure with band notch characteristics

Abstract

In this communication, a new compact ultra‐wideband (UWB) multiple‐input multiple‐output (MIMO) antenna with band notch characteristics is presented for wireless application. It comprises of two unique monopole antenna elements sharing a similar ground plane. To reduce the coupling between antenna elements, a modified T‐shaped stub equipped with Minkowski fractal shape elements are introduced on the ground plane which in turn establish a good isolation between radiating elements. A band notch is achieved at 5.45 GHz by adding two additional rectangular stubs at 45° where symmetric slots have been etched. The efficiency and gain of the antenna drops significantly at the centre of the notch band which indicates good interference suppression. Results show that the designed antenna delivers widest impedance bandwidth (−10 dB) throughout the operating band of 3.1–20 GHz (of 146% impedance bandwidth) which covers UWB as well as Ku‐band. The antenna also produces ‐18 dB isolation for most of the operating band and ‐16 dB up to 6 GHz. The optimized antenna is fabricated and tested showing |S11| characteristics below −10 dB from 3.1 to 20 GHz band. The dimension of the proposed antenna is 18 × 26 × 1.6 mm3. Results show that the simulated characteristics are in good agreement with the measured counterpart. The designed MIMO antenna is an appropriate candidate for UWB and other wireless applications.

A Compact UWB Monopole Antenna with Triple Band Notches

“…In [ 19 ], the WLAN and X-band communication systems were rejected by a pair of vertical slots and a horizontal rectangular slot etched onto the same radiation patch. In [ 21 ], two identical meander line slots were etched onto the two decoupling T-shaped stubs symmetrically to achieve a notch band from 5.09 to 5.8 GHz. In [ 22 ], by introducing two different dimensions of U-shaped parasitic strips on both sides of each feed lines, frequency bands of 7.37–7.8 GHz and 9.15–9.7 GHz were successfully suppressed.…”

Design of a compact magneto‐electric dipole antenna

“…However, the microstrip antenna has obvious disadvantages of narrow bandwidth and large aperture size due to the inherent high Q-value characteristic. 1 To alleviate this problem, many approaches have been proposed, such as adopting aperture-coupled feed 2 or L-probe feed, 3,4 loading fractal structure 5,6 and so on. Nevertheless, while increasing the impedance bandwidth, other properties deteriorated, such as large gain fluctuations, high cross-polarization level, and large size.…”

Aperture-Fed Quad-Port Dual-Band Dielectric Resonator-MIMO Antenna for Sub-6 GHz 5G and WLAN Application

“…One of the prime factors affecting the isolation between the ports of the MIMO antenna is the spacing between the elements on the antenna. ere has been significant research available in the literature for improvement in the port isolation across the antenna element, especially by introducing isolating elements or networks [11][12][13][14][15][16][17][18][19][20]. ere is substantial research on multiband MIMO wireless communication [21][22][23][24][25][26][27].…”