Center-Feed Post-Wall Waveguide Series-Feed Sidelobe-Suppression Slot Subarray for Millimeter-Wave Radar

IF 0.3 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC IEICE Communications Express Pub Date : 2025-02-25 DOI:10.23919/comex.2025XBL0009
Hayato Sato;Jiro Hirokawa;Takashi Tomura
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Abstract

We design a center-feed post-wall waveguide slot subarray of 25 radiating elements that suppresses E-plane sidelobes below -18 dB for the 76.5 GHz band (76.0 GHz to 77.0 GHz). First, by adjusting the dimension of the feeding aperture, the feeding part is designed to suppress reflection. Then, the slot lengths and post positions are adjusted, and the radiating elements are designed so that the excitation distribution calculated from the Taylor distribution is obtained. The overall structure is analyzed by combining the radiating part, in which the radiating elements are arranged so that their excitation phase distribution is uniform, and the feeding part. A prototype is fabricated and measured based on the design. The reflection is below -10 dB in a range of 74.1 GHz to 76.4 GHz for the calculated value and 74.5 GHz to 76.5 GHz for the experimental value. The sidelobe levels are sufficiently suppressed below -18 dB from 76.0 GHz to 76.6 GHz in both analysis and experiment.
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毫米波雷达中心馈电后壁波导系列馈电旁瓣抑制槽子阵列
我们设计了一个由25个辐射元件组成的中心馈电后壁波导槽子阵列,用于抑制76.5 GHz频段(76.0 GHz至77.0 GHz) e面旁瓣低于-18 dB。首先,通过调整进给孔径的尺寸,设计进给部分抑制反射。然后,调整槽长和桩位,设计辐射单元,得到由泰勒分布计算的激励分布。将散热元件布置使其激振相位分布均匀的散热部分与进料部分相结合进行整体结构分析。根据设计制作了样机并进行了测量。在74.1 GHz ~ 76.4 GHz的计算值和74.5 GHz ~ 76.5 GHz的实验值范围内,反射小于-10 dB。分析和实验结果表明,在76.0 GHz ~ 76.6 GHz范围内,副瓣电平被充分抑制在-18 dB以下。
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IEICE Communications Express
IEICE Communications Express ENGINEERING, ELECTRICAL & ELECTRONIC-
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33.30%
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