Abstract-We propose in this paper the design, realization and experimental characterization of a low-profile metamaterial "bent" monopole antenna with a total height of 0.027λ 0 and a fractional bandwidth of 24.4% around 1.3 GHz. The metamaterial (MTM) structure is a dual-layer mushroom-like electromagnetic band gap (DL-EBG) conceived and optimized to improve the antenna's operating bandwidth. Moreover, a "Sabre-Type" antenna composed by two identical "bent" monopole metamaterial antennas placed on both sides of a composite thin slab material has been simulated and realized. The "sabre" antenna provides a vertically polarization and omnidirectional radiation patterns in the elevation plane while its radiation patterns are almost directional in the azimuth plane. A maximum gain of 8.7 dB is obtained by measurement at 1.45 GHz. A remarkable agreement is obtained between the measured and the simulated results.

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Mots-clés :Métamatériau Antenne monopole Antenne « sabre » Antenne large-bande Antenne ultra-compacteThe "sabre" antenna is an array of two monopole elements, vertically polarized with omnidirectional radiation patterns, and placed on either side of a composite material on the tail of an airplane. As an in-phase reflector plane, the antenna uses a compact dual-layer high-impedance surface (DL-HIS) with offset mushroom-like Sivenpiper square shape unit cells. This topology allows one to control both operational frequency and bandgap width, while reducing the total height of the antenna to under λ 0 /36. The designed antenna structure has a wide bandwidth higher than 24% around 1.4 GHz. The measurements and numerical simulations agree very well.

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b) Figure 1. Dual-layer metamaterial structure, (a) Square patch unit cells with metalized vias, (a) Side view and (b) Top view of the top layer and the bottom layer (a) (b) (c) Figure 2. Lumped LC equivalent circuit of the Dual-layer EBG structure; Ctotal=1.4 pF and Ltotal =11.165 nH Abstract-This paper presents the design of an array antenna composed of two metamaterial-based thin monopole-like elements placed on either side of a composite material, on the tail of an airplane. A 0.022 sub-wavelength dual-layer electromagnetic bandgap (DL-EBG) is used as an in-phase reflector plane. It is composed of offset mushroom-like Sivenpiper EBG arrays. This topology allows controlling both operating frequency and bandwidth. For a total height of 0.028 wavelengths, the antenna achieves 8.5 dB of gain and 24% of bandwidth around 1.4 GHz. The array antenna has a vertical polarization and omnidirectional radiation. The measurements and numerical simulations agree well.