Multibeam Antenna for Telecommunications Networks Using Cylindrical EBG Structure

Abstract

International audienceWe present in this letter the study of a multibeam antenna for telecommunication networks by using cylindrical electromagnetic band-gap (EBG) structures. The EBG structure behaves as a partially reflecting surface (PRS) and enhances the directivity of a simple radiating source. We begin by presenting the principle of the multibeam antenna, and then we present a first version, conceived to operate in WiMAX band [5.45.7] GHz. Simulation results of this antenna will show us that the strong mutual coupling between the different excitation sources of the EBG structure badly influences its performance. In order to reduce the mutual coupling, metallic walls are inserted between the excitation sources. Moreover, excitation sources have been changed to improve the radiation performance of the antenna. A prototype of the final antenna is fabricated to validate our simulation results, and the measurements results are compared to the simulated ones

Cylindrical array of EBG sectoral antennas for Radar applications

“…2), presented in [8], is vertically polarized and designed to operate over 5.4% of bandwidth [5.4 -5.7] GHz. It is composed of a cylindrical metallic core with a diameter Da = 200 mm, surrounded by 18 3-mm-diameter cylindrical rods with a radial distance R = 33 mm, and forming an EBG resonant cavity.…”

“…Since the coupling between two sectors is drastically low as seen in [8] and shown in Fig. 2, the simulation of only one sector is enough to obtain the characteristics of one beam.…”

“…Cylindrical EBG structures have also been used to design other types of antennas like omnidirectional ones [6,7]. In a recent article, we presented a multibeam antenna, based on a cylindrical array of EBG sectoral antennas and dedicated for telecommunication applications [8]. Indeed this antenna operates around 5 GHz and provides a complete coverage of the horizontal plane with 18 beams, 15 dBi of directivity and a ripple of 0.4 dBi.…”

Rigorous Analysis of Electromagnetic Scattering by Cylindrical Ebg Structures

“…Cylindrically periodic structures have received a growing attention because of their potential applications to the designs of photonic crystal fibers [9,10], directive antennas or beam-switching antennas [11][12][13][14]. Recently, we have proposed a semi-analytical approach for twodimensional electromagnetic scattering, guidance and radiation by the cylindrical arrays.…”

Design of a Beam Forming Dielectric Cylindrical Ebg Antenna

“…Metallic rods have been used by Chreim et al to design CEBG antenna structures which achieved omnidirectional [13,14] and multibeam azimuthal patterns [15]. Boutayeb et al [16,17] presented antennas in which a metallic rods CEBG structure with an angular defect window improved the directivity of the enclosed monopole feed.…”