MIMO antenna with built‐in circular shaped isolator for sub‐6 GHz 5G applications

Abstract

A four‐port MIMO antenna design focused on the sub‐6 GHz fifth generation wireless communication application is presented. The design does not need any other decoupling structure for achieving isolation between multiple ports. A combination of four single wideband antenna units results in the formation of a circular‐shaped metallic disc in the ground plane of the proposed antenna. This disc acts as a pool of current with 180° phase difference leading to isolation between various ports. Diversity performance of the antenna is shown with the help of an envelope correlation coefficient using both S‐parameter and far‐field data. The radiation pattern of the proposed antenna has four lobes in four quadrants for proper reception of signals from different directions. A prototype of the designed antenna is fabricated and measured successfully.

Compact eight‐port MIMO/diversity antenna with band rejection characteristics

“…A number of MIMO antenna designs with two, four, and eight radiating elements have been reported in the last few years. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] However, there was always a trade-off of antenna dimensions, isolation, resonating range, radiation characteristics, and complexity in all of these presented designs and techniques.…”

Planar antenna beam deflection using low‐loss metamaterial for future 5G applications

“…However, these frequencies suffer a very high free‐space path loss according to Friis's formula, thereby providing short‐range communications in comparison with fourth‐generation (4G) bands. For easier execution of 5G technology in the early phase, telecommunication operators intend to utilize their present base station sites at the 3.5 GHz frequency band . The sub‐6‐GHz band of 3.5 GHz has been proposed as a candidate band for 5G networks at the microwave regime with the merits of low free‐space path loss compared to that of mmWave bands and the large bandwidth of 400 MHz .…”

“…For easier execution of 5G technology in the early phase, telecommunication operators intend to utilize their present base station sites at the 3.5 GHz frequency band. 2 The sub-6-GHz band of 3.5 GHz has been proposed as a candidate band for 5G networks at the microwave regime with the merits of low free-space path loss compared to that of mmWave bands and the large bandwidth of 400 MHz. 3,4 This frequency band has a noticeable propagation loss over a 4G band.…”

Multiple‐input‐multiple‐output/diversity antenna with dual band‐notched characteristics for ultra‐wideband applications

“…In addition, the polarization diversity is also employed in which multiple copies of the signal are received through antennas with different polarization. While designing multiple‐input‐multiple‐output (MIMO)/diversity antenna systems, the placement of multiple antenna elements within a small region is the most difficult task . This phenomenon becomes more evident in portable terminals, where limited space is provided, thus deteriorating the overall performance of the MIMO systems.…”

“…While designing multiple-input-multiple-output (MIMO)/diversity antenna systems, the placement of multiple antenna elements within a small region is the most difficult task. 10,11 This phenomenon becomes more evident in portable terminals, where limited space is provided, thus deteriorating the overall performance of the MIMO systems. Adding more radiating elements within a MIMO antenna improves the link reliability of the system.…”