Experimental and numerical simulation of a dual-band omnidirectional printed antenna

Abstract

Currently, there are many radio engineering and telecommunication systems, the exchange of information in which is carried out using radio signals. For each system, it is necessary to develop new antennas operating in a certain frequency range. Therefore, an urgent problem is development of radiating devices capable of operating simultaneously in two or more wide frequency ranges. This will allow the antenna to be used for multiple applications. The aim of the article is to develop and implement a small-sized printed antenna with a circular pattern in the azimuthal plane and horizontal polarization of the vector E, emitting and receiving a radio signal in the bands corresponding to the GSM-1800, LTE-1800, UMTS-2100 and n79 5G standards. An original design of a multilayer printed antenna with a circular radiation pattern in the azimuthal plane and horizontal polarization has been developed. The antenna consists of two printed circuit boards located one above the other. The bottom board contains a ring array of F-shaped radiators, which is excited using a high-frequency connector. The top board contains an array of passive dipoles that are excited by an electromagnetic field created by a ring array of F-shaped dipoles. According to the calculation results, the antenna emits and receives a radio signal in two frequency ranges: 1,65–2,38 GHz and 4,21–5 GHz (in terms of VSWR = 2). An antenna model has been made, its electrodynamic characteristics have been measured, and the experiment and simulation results have been compared. The developed antenna can be used as an independent radiator or an element of an omnidirectional antenna array of cellular communication standards GSM-1800, LTE-1800, UMTS-2100 and n79 5G.