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Miniaturisation des antennes large bande à l'aide de matériaux artificiels

Abstract : In the field of electronic warfare, control of the electromagnetic spectrum is essential. Antennas must have an extremely broad frequency coverage. Their frequency band of operation may exceed the decade, i.e. a ratio of 10 between high and low frequencies. In addition, the low frequency can be close to a hundred MHz thereby increasing the size of the antenna in the direction of thickness. The integration of low-band antenna is a major challenge. Frequency independent antennas loaded by a cavity absorbent are conventional antennas dedicated to electronic warfare commonly used. The work presented in this manuscript are intended to remove the absorbent present in antennas to increase efficiency and reduce their thickness. Our research was oriented towards artificial materials, such as artificial magnetic conductor (amc) and electromagnetic band gap materials (ebg), enabling the practical realization of magnetic reflector. After a state of the art of analytical, numerical and experimental methods, we study the behavior of an archimedean spiral antenna in free space and then with two types of theoretical reflectors: perfect electric conductor (pec) and perfect magnetic conductor (pmc). We proposed and experimentally validated an innovative methodology to design a wideband and low profile antenna. Finally, we presented a hybrid reflector composed of electrical and magnetic conductors. These two types of conductors are combined to extend the operating bandwidth of the antenna. Using an archimedean spiral, we show that antenna have exploitable properties at low and high frequency.
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Contributor : Michael Grelier <>
Submitted on : Tuesday, March 8, 2011 - 2:55:14 PM
Last modification on : Friday, October 23, 2020 - 4:37:49 PM
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  • HAL Id : pastel-00574620, version 1

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Michael Grelier. Miniaturisation des antennes large bande à l'aide de matériaux artificiels. Electromagnétisme. Télécom ParisTech, 2011. Français. ⟨pastel-00574620⟩

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