A Next Generation Mm-Wave 2-Port Mimo Antenna Array with Wideband Characteristics for Wireless Applications

Shahid Bashir; Kainat Ijaz

Authors

Shahid Bashir Department of Electrical Engineering University of Engineering and Technology, Peshawar, Pakistan
Kainat Ijaz Department of Electrical Engineering University of Engineering and Technology, Peshawar, Pakistan

Keywords:

5G, MIMO, Antenna Array, Mm-Wave, CCL

Abstract

Fifth-generation (5G) technology is attracting significant interest because of its advanced features and its capability to tackle the weaknesses of earlier generations. This paper presents an advanced compact L-shaped two-port MIMO antenna array that offers wideband performance, high isolation without using any decoupling structure, and low ECC for millimeter-wave (mm-wave) 5G systems. With a bandwidth equal to 13.9 GHz and a high gain of 6.9 dB, and is designed to operate in the frequency range from 26.1 GHz to 40 GHz. A compact and efficient MIMO structure is produced by placing the antenna elements orthogonally, which reduces mutual coupling. The proposed array is composed of two L-shaped antenna elements with a rectangular slot in a partial ground plane, each of them being built on a 0.254 mm thick Rogers RT5880 (lossy) substrate. The MIMO antenna array is 16 × 27 mm² in size, which shows a 33–70% reduction in size compared to recent wideband counterparts. The array design exhibits improved performance as the gain increases to 6.2 dBi and a radiation efficiency of over 95% across the operating band. It is discovered that there is less than -15 dB of isolation between the elements. Total active reflection coefficient (TARC) is less than −10 dB, is approximately 10 dB, channel capacity loss (CCL) is less than 0.1 bits/sec/Hz, and ECC < 0.001 is among the major MIMO performance parameters that are well within the optimal range, demonstrating a measurable and balanced trade-off between compactness and performance. The proposed design is compact and has high bandwidth without compromising performance, unlike previous designs in which improvement in one parameter often led to degradation in another. The aforementioned results confirm that the proposed design is suitable for next-generation millimeter-wave wireless communication systems.

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