Dielectric Gratings Enhancing the Field of View in Low Dielectric Permittivity Elliptical Lenses

Marta Arias Campo, Giorgio Carluccio, Simona Bruni, Nuria Llombart

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Low relative permittivity plastic elliptical lenses in combination with integrated focal plane arrays are a promising solution to be used in the future mm- and sub-mm-wave systems. Their appeal lies in the availability of materials with moderate loss and lightweight, and the possibility to use cost-effective manufacturing techniques. However, the achievable scanning angular range is relatively small with low permittivity lenses. In this article, we explore the use of dielectric gratings with modulated height integrated in the lens material, with the aim of enlarging the steering angle. The dielectric gratings synthesize a tilted feed pattern, reducing the reflection loss and spillover when illuminating the lens off-focus. A quasi-analytic approach based on the Floquet mode analysis of the gratings is used to synthesize the grating profile. This method is combined with an analysis in reception of the lens antenna. A wideband prototype in $G$ -band (140-220 GHz) has been fabricated, achieving a field of view of ±25° with gain >30 dBi.

Original languageEnglish
Article number9424370
Pages (from-to)7308-7322
Number of pages15
JournalIEEE Transactions on Antennas and Propagation
Volume69
Issue number11
DOIs
Publication statusPublished - 2021

Keywords

  • Beam steering
  • dielectric gratings
  • elliptical lens antenna
  • field of view (FoV)
  • leaky-wave (LW) antenna
  • mm-wave
  • wideband communications

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