Loading...

Wideband low-profile transmissive linear cross-polarizer for millimeter-wave applications

Hajitabarmarznaki, S ; Sharif University of Technology | 2023

0 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.optlastec.2023.109406
  3. Publisher: Elsevier Ltd , 2023
  4. Abstract:
  5. In this article, we report on the design and fabrication of wideband high-efficiency linear cross-polarizers operating in transmission mode at millimeter waves. The proposed structures include a metasurface-based analyzer layer consisting of modified double asymmetric split-ring resonator elements. The proposed analyzer layer along with an optimized polarizer layer is integrated into an ultra-thin double-layer printed circuit board. A resonant cut-wire-based metasurface and a non-resonant wire-grid structure are designed as the polarizer layer. It is observed that the cross-polarized transmission coefficient and the polarization conversion ratio can noticeably be enhanced in the double-layer structure as a result of the Fabry-Perot-like constructive interference. It is also found that the non-resonant polarizer layer leads to superior performance in terms of polarization conversion ratio and bandwidth. By using an off-the-shelf commercial substrate as the dielectric spacer and relying on the low sensitivity of the structure to the lateral offset between the two layers, the proposed cross-polarizers are readily fabricated by a conventional lithographic technique. The fabricated prototypes are measured by a quasi-optical photomixer-based continuous-wave terahertz spectroscopy system. The measurement results, in agreement with the simulations, reveal that a polarization conversion ratio of>95% over a fractional bandwidth of>110% is achievable by the proposed non-resonant wire-grid design. In addition, the measured cross-polarized transmission coefficient reaches up to 0.86 which is outstanding as compared to previously reported double-layer designs. The presented results can find application in millimeter-wave sensing and imaging systems that use polarimetric measurements. © 2023 Elsevier Ltd
  6. Keywords:
  7. Linear cross-polarizer ; Metasurfaces ; Millimeter waves ; Terahertz technology
  8. Source: Optics and Laser Technology ; Volume 163 , 2023 ; 00303992 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0030399223002992