Millimeter-wave FMCW radar development using SIW butler matrix for time domain beam steering

Pascual Hilario Re, Cristian Alistarh, Symon Podilchak, George Goussetis, John Thompson, Jaesup Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)


One possible limitation for automotive collision avoidance radar applications is unwanted antenna beam squinting over frequency. To circumvent this problem, this paper studies a novel K-band automotive radar that improves transmitted power distribution over the horizontal plane using a substrate-integrated waveguide (SIW) 4x4 Butler matrix (BM) beamforming network. The 24 GHz system, which is scalable to 77 GHz, uses frequency modulated continuous-wave (FMCW) transmission and scans the horizontal plane by switching the four input ports of the BM in time. The radar system has been calibrated and measured in an anechoic chamber and angular target position estimates have been completed using digital beamforming. These tests are also compared to a more conventional single-input multiple-output (SIMO) and multiple-input multiple-output (MIMO) FMCW radar configurations and it is shown that the proposed BM radar offers improvements in terms of higher return powers, improved signal-to-noise ratios, and enhanced field-of-view.

Original languageEnglish
Title of host publication2019 16th European Radar Conference (EuRAD)
Number of pages4
ISBN (Electronic)9782874870576
Publication statusPublished - 21 Nov 2019
Event16th European Radar Conference 2019 - Paris, France
Duration: 2 Oct 20194 Oct 2019


Conference16th European Radar Conference 2019
Abbreviated titleEuRAD 2019


  • Automotive radar
  • Butler Matrix
  • Multiple input multiple output (MIMO) radar
  • Short-range radar (SRR)
  • Substrate-integrated waveguide (SIW)

ASJC Scopus subject areas

  • Signal Processing
  • Instrumentation


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