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Bandwidth behavior of miniature cavity antennas

Abstract :

For mechanical or thermal performance or for integration into a small part of a platform it is sometimes required to place an antenna into a small metallic cavity. The main consequence is the reduction of the antenna bandwidth. The objective of this study is to investigate the maximum possible bandwidth depending on the cavity height at a fixed frequency (2.3GH)z. We compare simple cavity antennas to cavities with a patch at the aperture and to cavities with a proposed reactive impedance surface (RIS) replacing the patch. For this study we considered square cavities of sizes 32mm (0.246λ0), 40mm (0.3λ0) and 48mm (0.37λ0) and the effect of different relative permittivity values inside, namely 3.66, 6.15 and 10.2. For each height, up to a maximum height where matching is still possible, patch antennas were optimized to have minimum of S11 at 2.3 GHz equal to -33dB. Numerical results for patch antennas are compared to analytical predictions for a simple cavity antenna of the same size excited only by the TE mode and to cavities with a RIS at the aperture. Patch antennas show unexpected ependence of bandwidth on permittivity when cavity height is approaching the guided wavelength of the dominant TE mode in the cavity. Maximum bandwidth is observed to be the highest when a RIS is used at the aperture.

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https://hal.archives-ouvertes.fr/hal-01083919
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Submitted on : Tuesday, November 18, 2014 - 11:40:59 AM
Last modification on : Wednesday, April 27, 2022 - 3:58:11 AM
Long-term archiving on: : Thursday, February 19, 2015 - 10:50:52 AM

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  • HAL Id : hal-01083919, version 1

Citation

Mario Martinis, Ronan Sauleau, Kouroch Mahdjoubi, Sylvain Collardey, Loic Bernard. Bandwidth behavior of miniature cavity antennas. Journées JCGE'2014 - SEEDS, Jun 2014, Saint-Louis, France. ⟨hal-01083919⟩

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