This Letter deals specifically with sectoral antennas and focuses on the ability to design a bipolar structure using a double layer of metallic electromagnetic bandgap (M-EBG) materials working on orthogonal polarisations as a superstrate. This antenna is able to radiate in vertical, horizontal and dual polarisation with a wide radiation pattern form, i.e. presenting at least 608 angular beamwidth in the azimuth plane. A bipolar M-EBG sectoral antenna for WIMAX application [5.15-5.35] GHz is designed and its performances are presented. Finally, a prototype is realised and experimental measurements are compared to simulated ones.

This letter presents an original solution to solve the matching problem of the circularly self-polarizing electromagnetic band-gap (EBG) antennas. More precisely, a comprehensive method to design a self-polarizing EBG antenna will be detailed. This kind of antenna had been designed before, but it was very poorly matched. An iris-based matching system has been used here, which produced a satisfying return loss while deteriorating the axial ratio (AR). An original device will be introduced, which allowed us to compensate for this degradation. Finally, to validate this new structure, a 20-dBi antenna working around 9 GHz and showing an AR lower than 1 dB over a 100-MHz bandwidth has been conceived, realized, and successfully measured.

In this paper we present a novel approach to design a dual polarized sectoral antenna using a double layer of Metallic EBG materials working on orthogonal polarizations as a superstrate. This antenna is able to radiate in vertical, horizontal and dual polarization with a wide (or broad) radiation pattern form, i.e. presenting at least 60° angular beamwidth in the azimuth plane. EBG antennas with sectoral pattern are usually designed only for vertical and horizontal polarization. In this paper, we also present dual polarization.

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 60deg. 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.

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.

This work aims to study and design base station antennas with metallic electromagnetic band gap (EBG) materials able to create a sectoral radiation pattern presenting at least a 60∘ beamwidth. The use of metallic structures offers a new approach to industrial partners seeking to reduce costs and facilitate design procedures. A new method allowing the improvement of both the directivity and the bandwidth by using a printed antenna array is studied.

Conformal antennas design is a new approach of interest to those in radar and communication systems and antenna engineers, creating antennas having any desired pattern radiation which is determined by considerations like the type of the zone to be covered, urban or rural. This paper provides a fundamental understanding of the characteristics of EBG (electromagnetic band-gap) conformal antennas; we have considered planar metallic EBG structures and studied the role of electrical walls and their influence on electromagnetic radiation. An example of the conformal antennas, the sectoral ones, are presented. Then we showed a simulated metallic sectoral EBG antenna for WiMAX application. Finally, we presented a method for antenna beamforming using diodes, starting with a square one.

This paper presents several configurations where Frequency Selective Surfaces are used to improve EBG resonator antennas performances. The different detailed structures are mainly focused on the bandwidth limitation of these antennas which has been addressed in various ways. In addition to a wide band antenna, two structures showing a dual band functioning are presented, of which one moreover possesses some frequency agility. The building of several prototypes and their measurement has confirmed the promising theoretical results.

This paper presents a new design for EBG resonator antennas allowing to create dual-band antennas, thus making it possible for some applications to circumvent the problem of their narrow bandwidth. The design and the conception method are detailed and one application example is given

The properties of the antenna depend on three structural parameters: the thickness separating the two parallel mirrors, the complex reflectivity of the partially reflective mirror and the radiation of the probes that are distributed between the two mirrors. This shows that a coordinated action on these parameters can lead to a smart EBG antenna. The design of one of the two mirrors constituting the EBG resonator with a smart metamaterial allowing the control of the reflectivity is the key to obtain both a tunable operating frequency and the beam steering adjustment. We show how the feeding antenna can be used to contribute to the beam steering. So we explore the possibility to build smart metamaterials including MEMS or diodes

This letter describes the concept and the realization of a directive and circularly polarized antenna using an electromagnetic band gap material whose circular polarization is generated by the structure itself. Experimental and simulated results are presented for an antenna operating at 5GHz.