Design of a planar array of low profile horns at 28 GHz

Jou Yi Wang, Malcolm Ng Mou Kehn, Eva Rajo-Iglesias*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A planar array of low profile horns fed by a transverse slotted waveguide array in the low millimeter-wave regime (28 GHz) is presented. The array of transverse slots cannot be directly used as antenna as it has grating lobes due to the fact that slot elements must be spaced a guided wavelength. However, these slots can be transformed into low profile horns that with their radiation patterns attenuate the grating lobes. To this aim, low profile horns with less than 0.6λ0 height were designed. The horns include a couple of chips that contribute to further reduce the grating lobes especially in the H-plane. The good performance of the designed array was demonstrated by both simulations and experiments performed on a manufactured prototype. A 5 × 5 array was designed that has a measured realized gain of 26.6 dBi with a bandwidth below 2%, still useful for some applications such as some radar systems. The total electrical size of the array is 6.63λ0 × 6.63λ0 . The radiation efficiency is very high and the aperture efficiency is above 80%. This all-metal solution is advantageous for millimeter-wave applications where losses sustained by dielectric materials become severe and it can be easily scaled to higher frequencies.

Original languageEnglish
Article number6989
Pages (from-to)1-15
Number of pages15
JournalSensors (Switzerland)
Issue number23
StatePublished - 1 Dec 2020


  • Grating lobes
  • Low profile horns
  • Millimeter wave antennas
  • Transverse slotted waveguide arrays

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