4.6 Article

A Low-Cost and Efficient Microstrip-Fed Air-Substrate-Integrated Waveguide Slot Array

Journal

ELECTRONICS
Volume 10, Issue 3, Pages -

Publisher

MDPI
DOI: 10.3390/electronics10030338

Keywords

SIW; waveguide; slot array; mm-wave; 5G

Funding

  1. University Corporation for Atmospheric Research (UCAR): National Oceanic and Atmospheric Administration (NOAA) [26548]
  2. Aerotenna, Inc. [25929]

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The microstrip-fed air-substrate-integrated waveguide (ASIW) slot array antenna presented in this study offers high efficiency, low cost, simple manufacturing, and compatibility with standard PCB manufacturing processes, making it a suitable solution for simple and efficient antenna arrays in millimeter-wave applications.
A microstrip-fed air-substrate-integrated waveguide (ASIW) slot array with high efficiency and low cost is presented. The design cuts out the substrate material within SIW, replaces the vias with metallic sidewalls, and uses a simple microstrip line-waveguide transition to feed the slot array. Radiating slots are cut on a 5-mil brass-plate, which covers the top of the substrate cutout to resemble a hollow waveguide structure. This implementation provides a simple and efficient antenna array solution for millimeter-wave (mm-wave) applications. Meanwhile, the fabrication is compatible with the standard printed circuit board (PCB) manufacturing process. To demonstrate the concept, a 4-element ASIW slot array working at the n257 band for 5G communications was designed using low-cost Rogers 4350B and FR4 substrate materials. Our simulation result shows 18% more efficiency than a conventional SIW slot array using the same substrate. The fabricated prototype shows |S11| < -15 dB over 27-29 GHz and a peak realized gain of 10.1 dBi at 28.6 GHz. The design procedure, prototyping process, and design analysis are discussed in the paper.

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