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Compact wideband antenna above a wideband non-uniform artificial magnetic conductor

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Abstract

A compact wideband antenna place above a non-uniform artificial magnetic conductor (AMC) is presented. The antenna is composed of a wideband coplanar waveguide fed antenna, with wideband harmonic suppression characteristic using non-uniform defected ground structure. Besides, a non-uniform wideband AMC is designed. The AMC unit cell is composed of a square patch into which a four arms spiral shape is etched. It exhibits a wider ±90° bandwidth than the spiral unit cell and a smaller size than the square patch unit cell. The antenna is placed above the proposed AMC structure formed by 6 × 5 unit cells. The overall dimensions of the complete structure are 0.7 × 0.6 λ 20 , where λ 0 is the free-space wavelength at the lowest frequency. It offers a low-profile configuration with a total thickness of λ 0/14.3, and it is matched between 2.5 and 5.4 GHz (73.5 %). Furthermore, it has a stable main lobe radiation pattern in the E- and H-planes within the operating frequency band. Moreover, compared with the antenna without AMC, the broadside realized gain is significantly increased. A prototype has been realized, and there is a good agreement between simulated and measured results. Furthermore, the proposed structure presents a size reduction of about 34 %, and better radiation characteristics in comparison with the conventional square AMC.

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  1. Institut Mines Télécom, Télécom ParisTech - CNRS LTCI, 46 rue Barrault, 75634, Paris Cedex 13, France

    Lana Damaj, Anne-Claire Lepage & Xavier Begaud

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  1. Lana Damaj
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  2. Anne-Claire Lepage
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  3. Xavier Begaud
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Correspondence to Xavier Begaud.

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Damaj, L., Lepage, AC. & Begaud, X. Compact wideband antenna above a wideband non-uniform artificial magnetic conductor. Appl. Phys. A 117, 705–711 (2014). https://doi.org/10.1007/s00339-014-8726-3

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  • DOI: https://doi.org/10.1007/s00339-014-8726-3

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