Magneto‐electric dipole antenna array for 77 GHz automotive radar

• 發表在: IET Microwaves, Antennas & Propagation
• Main Authors: Dinuo Bu, Shi‐Wei Qu
• 格式: Article
• 語言: 英语
• 出版: Wiley 2024-02-01
• 主題: antenna radiation patterns; automotive electronics; millimetre wave antenna arrays; MIMO radar
• 在線閱讀: https://doi.org/10.1049/mia2.12445

Abstract A 1 × 4 magneto‐electric dipole (ME dipole) antenna array for 77 GHz automotive radar is proposed. The ME dipole is fed by a fork‐shaped microstrip line coupling through a dog‐bone slot. To meet the requirements aimed at automotive radar applications, the beamwidths of the proposed antenna are well‐designed. Specially, a method of adding passive elements on both sides of the array is proposed to increase the 3 dB beamwidth from ±34° to ±52° in azimuth. Additionally, in elevation, a 3 dB beamwidth of ±10° is achieved by designing the spacing between array elements. Moreover, based on low‐loss printed circuit board substrates, radiation efficiency of the proposed array can reach approximately 90% at 77 GHz. Furthermore, a 4 × 4 array is established by arranging four 1 × 4 subarrays spacing 1.95 mm (half a free‐space wavelength at 77 GHz) to study the interactions between subarrays for multiple input multiple output scenarios. A 1 × 4 and a 4 × 4 antenna prototypes are fabricated and measured to validate the correctness of this design. The results show that the proposed antenna is an eligible candidate for the medium‐ and short‐range automotive radars.