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A Novel Compact Highly Isolated UWB MIMO Antenna with WLAN Notch

Muhammad Awais1, Shahid Bashir1, Awais Khan1,2, Muhammad Asif2, Nasim Ullah3,*, Hend I. Alkhammash4
1 Department of Electrical Engineering, University of Engineering and Technology, Peshawar, 25000, Pakistan
2 Department of Electrical Engineering, University of Science and Technology, Bannu, 28100, Pakistan
3 Department of Electrical Engineering, College of Engineering Taif University, Al-Hawiyah, Taif, P.O. Box 888, Saudi Arabia
4 Department of Electrical Engineering, College of Engineering, Taif University, P.O. Box 11099, Taif, 21944, Saudi Arabia
* Corresponding Author: Nasim Ullah. Email: nasimullah@tu.edu.sa

Computers, Materials & Continua https://doi.org/10.32604/cmc.2022.033939

Received 01 July 2022; Accepted 07 September 2022; Published online 29 December 2022


This paper presents a compact Multiple Input Multiple Output (MIMO) antenna with WLAN band notch for Ultra-Wideband (UWB) applications. The antenna is designed on 0.8 mm thick low-cost FR-4 substrate having a compact size of 22 mm × 30 mm. The proposed antenna comprises of two monopole patches on the top layer of substrate while having a shared ground on its bottom layer. The mutual coupling between adjacent patches has been reduced by using a novel stub with shared ground structure. The stub consists of complementary rectangular slots that disturb the surface current direction and thus result in reducing mutual coupling between two ports. A slot is etched in the radiating patch for WLAN band notch. The slot is used to suppress frequencies ranging from 5.1 to 5.9 GHz. The results show that the proposed antenna has a very good impedance bandwidth of |S11| < −10 dB within the frequency band from 3.1–14 GHz. A low mutual coupling of less than −23 dB is achieved within the entire UWB band. Furthermore, the antenna has a peak gain of 5.8 dB, low ECC < 0.002 and high Diversity Gain (DG > 9.98).


Multiple input multiple output (MIMO); ultra-wide band (UWB); defected ground structure; envelope correlation coefficient; diversity gain
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