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Cylindrical conformation and miniaturization of cavity-backed magnetoelectric antenna with an outer Γ-shaped probe

Published online by Cambridge University Press:  07 December 2023

Alexandre Causse ,
Loïc Bernard Open the ORCID record for Loïc Bernard [Opens in a new window] ,
Sylvain Collardey  and
Ala Sharaiha
Alexandre Causse
Affiliation:
STC department, French-German Research Institute of Saint-Louis, Saint-Louis, France IETR, UMR CNRS 6164, University of Rennes 1, Rennes, France
Loïc Bernard*
Affiliation:
STC department, French-German Research Institute of Saint-Louis, Saint-Louis, France IETR, UMR CNRS 6164, University of Rennes 1, Rennes, France
Sylvain Collardey
Affiliation:
IETR, UMR CNRS 6164, University of Rennes 1, Rennes, France
Ala Sharaiha
Affiliation:
IETR, UMR CNRS 6164, University of Rennes 1, Rennes, France
*
Corresponding author: Loïc Bernard; Email: loic.bernard@isl.eu
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Abstract

In this article, the cylindrical conformation of a linearly polarized cavity-backed magnetoelectric (ME) antenna is studied. Starting from a planar ME antenna presenting a wide bandwidth due to a specific design of its feeding probe, the impact of conformation is shown; the coupling between the ME dipole and the cavity walls is demonstrated to be the key element to keep a wideband behavior. Conformal antennas offering the same impedance bandwidth as the planar antenna are presented operating at Global Navigation Satellite System frequencies (1.164–1.61 GHz). As a result of the conformation, the antenna size has to be reduced to maintain the coupling and a wideband behavior. A prototype conformed to a 44-mm radius cylinder was built using low-cost additive manufacturing. External dimensions of 62 × 62 × 35 mm3 (0.285 × 0.285 × 0.16λ03, where λ0 is the wavelength at 1.38 GHz) were obtained, showing a ground plane area reduction of 46% compared to the planar antenna with the same materials. The conformal antenna also exhibits very steady radiation properties with a gain of around 4.5 dBi and a very similar and stable 3 dB beamwidth around 113° in E- and H-planes. A relatively good agreement is found between measurements and simulation.

Keywords

cavityconformal antennaGNSSmagnetoelectric antennawideband
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 9
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Copyright
© French German Research Institute of St Louis and Institut d'Electronique et des Techniques du Numérique, 2023. Published by Cambridge University Press in association with the European Microwave Association

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