Highly integrated beam scanning groove gap waveguide leaky wave antenna array

Jianyin Cao, Hao Wang*, Shifei Tao, Shanxiang Mou, Yongxin Guo

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

30 Citations (Scopus)

Abstract

In this communication, a novel 2-D beam scanning antenna array is designed and fabricated in metallic 3-D printed technology with high integration and reduced fabrication complexity in millimeter waves. The array is composed of four leaky wave antennas and a Butler matrix based on groove gap waveguide (GWG) technology. One dimension of the beam scanning performance is realized by moving one row of pins along the groove based on the GWG concept. Meanwhile, the sidelobe levels of the radiation patterns are reduced to −20 dB by controlling the height and distance of pins along groove. The beam direction of the low sidelobe leaky wave antenna changes from 110 to 140, while the frequency shifts from 25 to 35 GHz. Another dimension of the beam scanning capability is realized with the Butler matrix in groove GWGs. The design of this Butler matrix is based on the coupling between multilayered groove GWGs. By this means, the low sidelobe leaky wave antennas are connected directly to the Butler matrix with no more transition structures. The main beam direction of the antenna array shifts from −41 to 41, when the exciting ports change in order. The simulated and measured port isolations are lower than −15 dB over the frequency band of 27-35 GHz, and they match well with each other. © 2020 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.
Original languageEnglish
Pages (from-to)5112-5117
JournalIEEE Transactions on Antennas and Propagation
Volume69
Issue number8
Online published25 May 2020
DOIs
Publication statusPublished - Aug 2021
Externally publishedYes

Research Keywords

  • 2-D beam scanning
  • 3-D printed technology
  • Gap waveguide (GWG)
  • Leaky wave antenna
  • Millimeter wave (mmW)

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