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Compact Waveguide Antenna Design for 77 GHz High-Resolution Radar.

Chin-Hsien Wu1, Tsun-Che Huang1, Malcolm Ng Mou Kehn2

  • 1Wistron NeWeb Corporation, Hsinchu 300092, Taiwan.

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This study presents a novel 77 GHz millimeter-wave antenna array for automotive radar, improving detection range and angular resolution. The waveguide-based design offers higher performance than traditional patch antennas for 5G and 6G applications.

Keywords:
millimeter-wavenarrow-wall slotsopen-ended waveguideslotted waveguide antenna

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Area of Science:

  • Electromagnetics and Wave Propagation
  • Antenna Theory and Design
  • Automotive Radar Systems

Background:

  • Millimeter-wave antennas are crucial for 5G/6G, especially in automotive systems.
  • Key performance metrics for automotive antennas include detection range and angular resolution.
  • Waveguide antennas offer lower losses compared to conventional patch antennas.

Purpose of the Study:

  • To design and evaluate a novel 8-element slot array antenna for automotive radar at 77 GHz.
  • To achieve high gain, narrow beamwidth, and cross-polarization cancellation for enhanced performance.
  • To explore extendable planar array designs for future automotive sensing applications.

Main Methods:

  • Design of an 8-element slot array on a rectangular waveguide's narrow wall.
  • Utilizing tilted Z-shaped slots for gain enhancement and cross-polarization cancellation.
  • Employing Chebyshev distribution for sidelobe suppression and external waveguides for polarization purification.

Main Results:

  • The proposed antenna design achieves high gain and narrow beamwidths at 77 GHz.
  • Tilted slots and external waveguides effectively manage polarization and reduce cross-polarization.
  • Simulations and prototype measurements confirm the design's potential for automotive radar.

Conclusions:

  • The developed waveguide slot array antenna is a promising solution for advanced automotive radar systems.
  • The design offers superior performance metrics compared to traditional patch antennas.
  • The modular design allows for scalability and adaptation to various automotive sensing requirements.