Low-Profile Scanloss-Reduced Integrated Metal-Lens Antenna

Sabin Kumar Karki*, Juha Ala-Laurinaho, Ville Viikari

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)
124 Downloads (Pure)

Abstract

Integrated lens antennas are widely used in high gain and beam steering applications at millimeter-wave frequencies. The ILA has often large height and suffers from significant scan loss. In this article, we demonstrate a low-profile, efficient, and scanloss-reduced integrated metal-lens antenna (IMLA). An IMLA is a combination of a dielectric lens and metal-plate lens. A 16-λ 0 diameter IMLA is designed using the HDPE and 58 stainless steel plates to achieve the f/d of 0.69. The simulated aperture and radiation efficiency of the IMLA are 73% and 92%, respectively. At 76 GHz, the simulated and measured realized gains of the fabricated IMLA are 31.24 and 31 dBi, respectively. The IMLA is designed to steer the main beam to ±30°. The scan loss is reduced by tilting the radiation pattern of the feeds at offset positions along the focal plane. The radiation pattern of the square waveguide feed is tilted using asymmetrical dielectric pins. The asymmetrical dielectric pins reduce the simulated gain scan loss of the IMLA by more than 1.5 dB at 30° steering angle. The simulation results show that the inclination of the feed radiation pattern helps limit the scan loss of the IMLA to 4.1 and 4.3 dB in the H-and E-planes for 30° steering angle, respectively. The measured scan loss of the manufactured IMLA is 3.8 and 6.2 dB in the H-and E-plane, respectively.

Original languageEnglish
Pages (from-to)876-887
Number of pages12
JournalIEEE Transactions on Antennas and Propagation
Volume70
Issue number2
DOIs
Publication statusPublished - 1 Feb 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • Antenna
  • Beam switching
  • Beam tilt
  • Dielectric lens antenna
  • High gain antenna
  • Low-profile lens
  • Matching layers
  • Metal-plate lens
  • Millimeter-wave frequencies
  • Scan loss reduction

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