Extremely Close Integration of Dual Band Sub-6 GHZ 4g Antenna With Unidirectional Mmwave 5g Antenna

Abstract

An extremely close integration of a dual band sub-6 GHz 4G antenna with a 28 GHz 5G antenna is proposed in this article. Firstly, a dual band 4G LTE (Long term Evolution) antenna is designed on an inexpensive substrate. The proposed antenna operates in the 2.5 GHz and 3.5 GHz LTE bands. The antenna has dimensions of 63× 5.6× 0.5 mm 3 , indicating an electrically small design. As the width of the antenna is less than 7 mm, it could be easily mounted on commercial mobile devices. The patterns for both the bands are almost omnidirectional as desired by the low frequency antennas. The proposed antennas do not carry any additional miniaturization or tuning circuitry hence simplifying fabrication process. Secondly, an angled dipole with Yagi topology is proposed, which works in the 28 GHz mmWave 5G band. The angled dipole has dimensions 28.3 × 5.6 × 0.5 mm 3 , which is also electrically compact and has a high front to back ratio. The microwave and millimetre wave antennas are placed orthogonally for minimal mutual coupling. The characteristics of both the antennas are not affected by the presence of the other element. Detailed results are shown in this article.

Design, developments, and applications of 5G antennas: a review

“…The different structures of mutual coupling reduction techniques between the antenna elements such as EBG, PBG, and DGS, were studied in paper. The main focus was to review, analyze, and compare different sub-6 GHz (2-8 GHz) antennas and mm-wave antennas (24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40)(57)(58)(59)(60)(61)(62)(63)(64)(64)(65)(66)(67)(68)(69)(70)(71). The mentioned antenna designs in the paper have achieved >6 dBi gain with radiation efficiency around 80%, and isolation achieved was >20 dB.…”

“…A sub-6 GHz band will be able to cover the larger geographical areas for 5G coverage, but will not be able to provide high downlink speed [30], while an mm-wave 5G technology will be able to provide high downlink speeds, but at the cost of less geographical area coverage. The frequency band 4.8-5.0 GHz of sub-6 GHz is allocated as an official band for 5G wireless systems [31]. In the sub-6 GHz spectrum, the focus will be on the 3.5 GHz band having a 400 MHz bandwidth (3.4-3.8 GHz), as is commercially available globally.…”

Compact and Integrated Microstrip Antenna Modules for mm-Wave and Microwave Bands Applications

“…The structure had the size of 30 × 14 × 0.254 mm 3. The corner-bent approach was also adopted by the authors in [22] to design an LTE -mm-Wave 5G dual band antenna configuration. The proposed configuration was composed of two geometrically perpendicular arms with a bent substrate, one for the LTE band (2.5-3.5 GHz) and the other for the 5G band (28 GHz).…”