Dual-Polarized Highly Folded Bowtie Antenna With Slotted Self-Grounded Structure for Sub-6 GHz 5G Applications

Mohammad Alibakhshikenari,Mobayode O Akinsolu,Jian Yang,Pancham Shukla,Sadegh Mansouri Moghaddam,Ashraf Uz Zaman,Raed Abd-Alhameed,Francisco Falcone,Chan Hwang See,Ernesto Limiti,Bo Liu,Samia Shafqaat,Bal S Virdee

doi:10.1109/tap.2021.3118784

Abstract

In this communication, a novel dual-polarized highly folded self-grounded Bowtie antenna that is excited through I-shaped slots is proposed for applications in sub-6 GHz 5G multiple-input-multiple-output (MIMO) antenna systems. The antenna consists of two pairs of folded radiation petals whose base is embedded in a double layer of FR-4 substrate with a common ground-plane which is sandwiched between the two substrate layers. The ground-plane is defected with two I-shaped slots located under the radiation elements. Each pair of radiation elements are excited through a microstrip line on the top layer with RF signal that is 180° out of phase with respect to each other. The RF signal is coupled to the pair of feedlines on the top layer through the I-shaped slots from the two microstrip feedlines on the underside of the second substrate. The proposed feed mechanism gets rid of the otherwise bulky balun. The Bowtie antenna is a compact solution with dimensions of 32 <inline-formula> <tex-math notation="LaTeX">$\times $ </tex-math></inline-formula> 32 <inline-formula> <tex-math notation="LaTeX">$\times\,\,33.8$ </tex-math></inline-formula> mm<sup>3</sup>. Measured results have verified that the antenna operates over a frequency range of 3.1–5 GHz and exhibits an average gain and antenna efficiency in the vertical and horizontal polarizations of 7.5 dBi and 82.6%, respectively.

Highlights

The proliferation of wireless technologies and the Internet of Things (IoT) has necessitated the development of generation of technologies, such as 5G, that provide greater channel capacity and significantly higher data transmission rate compared to 4G/LTE [1]
Among the numerous types of wideband antennas, the self-grounded Bowtie antenna has the benefit of structural simplicity and compactness [16], [17]
The antenna comprises four folded radiation petals embedded on two layers of FR-4 substrate

Summary

INTRODUCTION

The proliferation of wireless technologies and the Internet of Things (IoT) has necessitated the development of generation of technologies, such as 5G, that provide greater channel capacity and significantly higher data transmission rate compared to 4G/LTE [1]. The novelty of this work includes: 1) realization of a small form factor dual-polarized Bowtie antenna design; 2) using a highly compact feeding mechanism; 3) reduction of sidelobes by surrounding the radiation petals with a metal wall; and (iv) realization of a large beamwidth to enable wide-angle scanning in phased array antennas. THE HIGHLY FOLDED SELF-GROUNDED BOWTIE The aim of this work was to design a highly compact self-grounded Bowtie antenna for an application in phased array antennas In this application the antenna spacing must be limited to 0.5λo to enable wide scanning angles this must be achieved without introducing grating lobes and reduction in the gain and bandwidth that result from strong mutual coupling between adjacent radiators. Meeting the requirements for the S-parameters becomes the primary focus of the optimization procedure as soon as Greal and BW3 dB are satisfied

OPTIMIZED VALUES

PARAMETERS FOR DEFINING FEEDING STRUCTURE AND THEIR

CONCLUSION