Antipodal vivaldi array MIMO antenna for 5G FR2 applications at 28 GHz with improved isolation

Abstract

This paper proposed a two port antipodal vivaldi antenna (AVA) for 5G FR2 (frequency range 2) applications at 28 GHz with improved bandwidth,gain and isolation. Each antenna consists of two array elements. The proposed antenna has dimensions 23.8 × 54 × 0.79 mm3 and is fabricated on Rogers RT/Duroid 5880 material. This material has a 2.2 low dielectric constant and mainly suitable for broadband high frequency applications. Proposed antenna covers −10 dB below from 25.51 to 33 GHz band, which having 7.49 GHz bandwidth. Gain for the presented MIMO (Multiple input multiple output) AVA array is varying from 8.50 to 12.44 dBi. A better isolation −34.56 dB is obtained between two antenna elements. MIMO characteristics like ECC (Envelope correlation coefficient), CCL (Channel capacity loss), DG (Diversity Gain), TARC (Total active reflection coefficient), and MEG (Mean effective gain) are satisfied with good results for presented antenna. The proposed antenna is designed using ansys HFSS simulation tool.

A MIMO antenna array featuring dual wideband and high gain for 5G NR n257/n258/n260/n261 bands applications

“…The MIMO array antenna configured with 2 × 12 radiating elements operates at 28 GHz to support n261 NR 5G band [36]. The MIMO antipodal Vivaldi antenna (AVA) array antenna is designed in [37], which operates at 28 GHz with a broad frequency coverage band of extending from 25.51 to 33 GHz. A new shape of MIMO antenna is presented in [38], which resembles a palm tree for 5G applications, achieving extensive bandwidth ranging from 23.4 GHz to 35 GHz, and a peak gain of 12.4 dB.…”