A Wideband Dual-Polarized Antenna and its Array With Electrically Downtilt Function for 5G Sub-6 GHz Communication Applications

Abstract

A wideband dual-polarized antenna is proposed for 4G and 5G communication applications. The antenna element consists of a pair of opened-loop dipoles for dual-polarization and its three inherent resonant modes are shifted closer to form a wide bandwidth. With additional U-shaped slots etched around the feed point, the input impedance of the antenna element is matched to 50 Ohm. The fabricated antenna element operates from 1.8 to 4.0 GHz, having 75.9% (VSWR ≤ 2) impedance bandwidth and high port-toport isolation (> 25 dB). It also achieves a 67±1 • beamwidth in H-plane and 68.7 ± 3.3 • in V-plane with 8.5 ± 1 dBi gain across the supported bands. By using six antenna elements and designing RF phase shifting module (RFPSM) based on vector modulators, a six-element dual-polarized array with electrically downtilt is also fabricated and measured, realizing a peak gain of 16.8 dBi, a similar beamwidth in H-plane as single antenna element and an electrically downtilt in V-plane from 0 • to 12 • which is preferred in communication applications. This antenna array could be used for future 5G communication and other applications. INDEX TERMS Wideband, dual-polarized, electrically downtilt, opened-loop dipoles, 5G.

On the Design of Dual-Polarised Linear Antenna Arrays with Enhanced Port-to-Port Isolation

“…This is the result of a non-optimal choice of phase shifts for currents feeding the individual radiators. In [23,32,33] the isolation of the array is 25-31 dB, which is similar to the isolation of the applied single antenna. In [29,30] the isolation of a single radiator is relatively high (38-39 dB) due to differential feeding.…”

“…In the literature, little attention is paid to linear antenna arrays which, due to their wide radiation pattern in the horizontal plane, could be used as base station antennas. Antenna arrays proposed by other authors do not offer sufficient isolation [15,23,[31][32][33], or, despite satisfactory isolation, offer an operational frequency band that is too narrow [25]. This paper describes the design process of the dual-polarisation linear antenna arrays using a four-element antenna array for U-NII 5.15-5.925 GHz frequency band as an example.…”

A compact triple‐band dipole array antenna for selected sub 1 GHz, 5G and WiFi access point applications

“…In Refs. [4,7,19,[24][25][26][27][28], due to the fact that a multi-layer stacked structure is used, it is difficult to improve the antenna's profile. For base station antennas, it is essential to have a high gain in the broadside direction to serve further users.…”

Coplanar Dual-Band Dual-Polarized Shared-Aperture Antenna Array For 4/5G Base Station Applications

“…However, the combination of these arrangements will lead to a large array size without any doubt. To solve this problem, there are many base station antennas are reconstructed to embrace dual-band in a compact space [3][4]. But there are the other question that we must design two or more feed networks to achieve different functions for each band [5].…”