PCB-Based Design of a Beamsteerable Array with High-Gain Antennas and a Rotman Lens at 28 GHz

Mikko Heino*, Clemens Icheln, Jaakko Haarla, Katsuyuki Haneda

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)


This letter presents a low-cost single-layer printed circuit board (PCB) design of a Rotman lens and an eight-element Yagi-Uda antenna array suitable for radio frequency (RF) beamsteering at 28 GHz. The antenna array realizes 19 dBi gain due to the guiding parasitic elements of each antenna element and a shaped ground plane surrounding the array. The array radiates in a direction parallel to the PCB enabling the possibility for two-dimensional beamsteering by stacking the PCBs. Integrated with an RF switch network, the design has seven switchable beams to the directions-30 °,-20°,-10°, 0°, 10°, 20°, and 30°. The measured realized gain is still as high as 4-10 dBi including losses of the Rotman lens and the RF switches, thanks to the high-gain antenna array design. The array works wideband across 25.5-28.5 GHz where broadside beam gains are better than 8 dBi. This is the first letter in the literature introducing an experimentally verified design of a PCB endfire antenna array at 28 GHz including all necessary components for RF beamsteering, i.e., a Rotman lens and a switch network.

Original languageEnglish
Article number9169775
Pages (from-to)1754-1758
Number of pages5
JournalIEEE Antennas and Wireless Propagation Letters
Issue number10
Publication statusPublished - Oct 2020
MoE publication typeA1 Journal article-refereed


  • beam-switching
  • Beamsteering
  • fifth-generation (5G) antennas
  • millimeter-waves
  • planar Yagi-Uda
  • Rotman lens antenna

Fingerprint Dive into the research topics of 'PCB-Based Design of a Beamsteerable Array with High-Gain Antennas and a Rotman Lens at 28 GHz'. Together they form a unique fingerprint.

Cite this