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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

In this letter, we present a novel approach to design a novel dual-band sectoral antenna by combining metallic electromagnetic band-gap (EBG) materials as a superstrate with a frequency-selective surface (FSS) as a substrate, thus making it possible to circumvent the narrow bandwidth problem. This antenna operates according to a sectoral radiation pattern form presenting a half-power beamwidth of at least 60 . Using the multisource technique, we carry out a network of interlaced radiant apertures that makes it possible to obtain a more important directivity by summation of the apertures' contribution. The geometry and characteristics of the antenna are detailed, and a design method is proposed.Index Terms-Directivity enhancement, dual-band antenna, frequency-selective surface (FSS) layer, metallic electromagnetic band-gap (EBG) antenna, printed antenna, sectoral pattern, UMTS.

In this paper we present a novel approach to create a dual frequency band of a new sectoral antenna design combining Metallic EBG materials as a superstrate with a Frequency Selective Surfaces (FSS) as a substrate. The geometry and working of the antenna are detailed and a design method is proposed.