4-Port MIMO Antenna with Defected Ground Structure for 5G Millimeter Wave Applications

Mahnoor Khalid,Muhibur Rahman,Syeda Iffat Naqvi,Yasar Amin,Fawad Fawad,Muhammad Jamil Khan,Seyed Sajad Mirjavadi,Niamat Hussain

doi:10.3390/electronics9010071

Abstract

We present a 4-port Multiple-Input-Multiple-Output (MIMO) antenna array operating in the mm-wave band for 5G applications. An identical two-element array excited by the feed network based on a T-junction power combiner/divider is introduced in the reported paper. The array elements are rectangular-shaped slotted patch antennas, while the ground plane is made defected with rectangular, circular, and a zigzag-shaped slotted structure to enhance the radiation characteristics of the antenna. To validate the performance, the MIMO structure is fabricated and measured. The simulated and measured results are in good coherence. The proposed structure can operate in a 25.5–29.6 GHz frequency band supporting the impending mm-wave 5G applications. Moreover, the peak gain attained for the operating frequency band is 8.3 dBi. Additionally, to obtain high isolation between antenna elements, the polarization diversity is employed between the adjacent radiators, resulting in a low Envelope Correlation Coefficient (ECC). Other MIMO performance metrics such as the Channel Capacity Loss (CCL), Mean Effective Gain (MEG), and Diversity gain (DG) of the proposed structure are analyzed, and the results indicate the suitability of the design as a potential contender for imminent mm-wave 5G MIMO applications.

Highlights

In the modern era, the eminent increase of wireless devices, inadequate bandwidth, and limited channel capacity have substantially promoted efforts to develop advanced standards for communication networks
The bandwidth obtained for the antenna array
The bandwidth obtained for the antenna array is

Summary

Introduction

The eminent increase of wireless devices, inadequate bandwidth, and limited channel capacity have substantially promoted efforts to develop advanced standards for communication networks. This has promoted the development of next-generation (5G). Multiple-input multiple-output (MIMO) antenna has been determined to be a key enabling technology for current and future wireless systems, demonstrating concurrent operation of multi-antennas, increasing channel capacity along with the benefits of high data rates and throughput of Gigabits/sec [9,10,11]. The 5th generation MIMO antenna requires high bandwidth for concurrent functioning, while the high gain is required to reduce the atmospheric diminutions and absorptions at mm-wave frequencies, and compactness of structure is needed to facilitate the assimilation in MIMO systems. The challenges associated with MIMO antenna designing are to design closely packed antenna elements with reduced mutual coupling and high isolation, which subsequently improves the antenna performance

Methods

Results

Conclusion