On the Cross-Polarization Levels of Arrays With Wide Angle Impedance Matching Layers

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Abstract

The characteristic cross-polarization (X-pol) of wide angle impedance matching (WAIM) structures is investigated. The study considers an ideal linearly polarized current sheet in the presence of various dielectric and artificial dielectric superstrates, analyzed using transmission line models representing the stratified media. The main mechanism that causes increased X-pol is highlighted and linked to the anisotropy of the superstrate. We then propose an approach to reduce the X-pol by including vertical vias within the WAIM dielectrics, to control the vertical component of the permittivity tensor. The intrinsic X-pol performance of a set of artificial dielectric layers (ADLs) with and without vias is experimentally verified by placing the WAIM above an open-ended waveguide that acts as a linearly polarized source. The proposed WAIM with vias can be used in wideband wide-scanning array designs to improve polarization purity.

Original languageEnglish
Pages (from-to)5078-5087
Number of pages10
JournalIEEE Transactions on Antennas and Propagation
Volume72
Issue number6
DOIs
Publication statusPublished - 2024

Bibliographical note

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • Artificial dielectric layers
  • cross-polarization
  • Dielectrics
  • Impedance
  • Impedance matching
  • Microstrip antenna arrays
  • Permittivity
  • Power transmission lines
  • Slabs
  • Wheeler’s current
  • wide angle impedance matching

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