CPW-Fed All-Metallic Vivaldi Antennas With Pattern Diversity for Millimeter Wave 5g Access Points

Abstract

A coplanar waveguide (CPW) fed uniplanar all-metallic antenna is proposed for mmWave 5G access points. The antenna has an impedance bandwidth from 26 to 30 GHz with a corresponding end-fire gain of 8 dBi at 28 GHz. The effective radiating volume is 0.0031λ 3 0 indicating a high gain yield for minimal physical footprint. The radiation efficiency is 99.5%, and the losses are primarily due to finite conductivity of copper. The pattern integrity is high across the band with cross-polarization level below 30 dB, due to lack of electrically thick dielectric substrate. Industry standard low-cost chemical etching technique is used for fabrication of the prototype. A compact, co-polarized stacked beam switching module is also proposed for wide angular coverage with three-ports. This module houses the proposed all-metallic antennas for beam switchability. A customized 3D-printed scaffolding using polylactic acid (PLA) is designed to house the proposed antennas. The antenna module has a wide angular coverage of ±50 • . Since the proposed antenna has high radiation efficiency with high gain for minimal physical footprint, it could be a potential solution for mmWave 5G access points. Detailed simulated and measured results are presented with technical justification.

A thin shared radiator based ACS‐fed orthogonal pattern diversity antenna with physical tilt for mmWave 5G access points

“…The end‐fire antennas are preferred over broadside ones for 5G cellular devices and access points due to wide angular beam coverage and desired line‐of‐sight communication 6 . There are only few reported antenna designs proposed for mmWave 5G access points like in, 7 which introduces all‐metallic pattern diversity based Vivaldi antennas for wide angular coverage. Although the antenna utilizes uniplanar co‐planar waveguide (CPW) feeding for realizing all‐metallic topology, however the proposed antenna requires end‐launch connector to clamp two tapered all‐metallic arms together for making it continuous structure that limits its usage for practical applications.…”

A 28 GHZ Surface-Mount Endfire Antenna Based on Ball Grid Array Packaging for 5g New Radio

“…A large amount of research on the 5G mmWave antenna has been reported [8][9][10][11][12][13]. Some magnetoelectric dipole antennas are introduced in [8] and [9].…”

“…In [11], a titled radiation antenna toward 5G communication is introduced. A high radiation efficiency Vivaldi antenna based on an all-metallic structure is shown in [13]. The performance of the above antennas is good.…”