Design of MIMO Antenna with Double L-Shaped Structure for 5G NR

Abstract

To satisfy the demand for 5G communication to smartphone terminal antennas in element quantity and isolation, an eight-element wideband MIMO antenna set of high isolation level is proposed. Each antenna element in the array is a double-L antenna consisting of an L-shaped slot and an L-shaped 50 Ω microstrip line. The L slot is formed by adding an I-shaped open circuit directly to the side of the rectangular slot. In addition, the antenna arrays are located on the long bezels on both sides of the mobile phone motherboard, and the coupling feed is made in the frequency range of 3.6–4.7 GHz through the L-shaped microstrip line, so as to cover the 5G NR band (N77/N78/N79). Finally, the four element pairs (8 components) achieve isolation of greater than 11 dB, the performance frequency range is 3.6–4.7GHz, the return loss is −6 dB, the total efficiency is greater than 85%, and the envelope correlation coefficient is less than 0.08. Other MIMO performances are also calculated, the design process is discussed in detail, and one-handed grip mode and two-handed grip mode are discussed to demonstrate their stabilities in real-world applications.

Design and Performance Evaluation of a 6×6 MIMO Array with Partial Ground Plane for Sub-6 GHz Mobile Applications

“…In recent times the researchers have also made several approaches to propose innovative designs consisting of six [9], eight [10][11][12][13], ten [14] and twelve [15,16] element MIMO array antennas to improve the parameter of MIMO for mobile phone for sub-6 GHz (5G) communications. In [9], the authors have proposed a six-element MIMO array that operates below 2.5 GHz.…”

“…The omission of SAR analysis hinders evaluating its suitability for smartphone use. Similarly, [13] presents an 8-element array operating between 3.6-4.7 GHz, characterized by an open L-slot on the ground plane and a coaxial feed L-shaped radiating element. This structure yields a favorable ECC of 0.08 and TE ranging from 87-96%.…”

Synthesis and characterization of cerium doped NiZn nano ferrites as substrate material for multi band MIMO antenna

“…Small, lightweight MIMO antennas are crucial in achieving these goals. However, developing MIMO antennas is a challenge as their size, weight, and separation between nearby antennas can significantly impact the radiation performance of overall MIMO system [ 2 ]. Various methods have been developed to improve the data transfer capacity, separation between nearby antennas, and reduce the size of MIMO antenna components.…”

A Balanced Symmetrical Branch-Line Microstrip Coupler for 5G Applications

“…Microstrip devices play a crucial role in RF communication systems as they allow for the miniaturization, integration, and cost-effective realization of various components such as filters, couplers, power dividers, and antennas [1][2][3][4]. Since microstrip couplers have been in wide-spread demand for modern wireless communication systems, several novel types have been reported recently.…”