The design of the 77-GHz radar absorbing materials (RAMs) that are suitable for the automotive environment is conducted using a square-patch frequency-selective surface (SP-FSS) on the surface of a grounded dielectric substrate. The inductance ( $L$ ) and capacitance ( $C$ ) of the SP-FSS were determined using the strip wire conductor model and used for determining the resonance frequency and substrate thickness. Impedance matching is satisfied at 77 GHz with a controlled FSS resistance matched to the free-space impedance. The optimized surface resistance of the SP-FSS conductor is $R_{s} = 94\,\,\Omega $ /sq (corresponding to the circuit resistance $R = 377\,\,\Omega$ ) for the lowest reflection loss of −37 dB at 77 GHz. The experimental result with a test sample prepared by the screen printing method is in good agreement with the simulation result and verifies the validity of the proposed design method.

中文翻译：

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使用频率选择表面为自动驾驶汽车设计和制造 77-GHz 雷达吸收材料

适用于汽车环境的 77-GHz 雷达吸波材料 (RAM) 的设计是使用接地介电基板表面上的方形贴片频率选择表面 (SP-FSS) 进行的。电感（ $L$ ) 和电容 ( $C$ ) 的 SP-FSS 是使用带状线导体模型确定的，并用于确定谐振频率和基板厚度。阻抗匹配在 77 GHz 时满足，受控 FSS 电阻与自由空间阻抗匹配。SP-FSS 导体的优化表面电阻为 $R_{s} = 94\,\,\Omega $ /sq（对应电路电阻 $R = 377\,\,\Omega$ ) 在 77 GHz 时具有 -37 dB 的最低反射损耗。用丝网印刷法制备的试件的实验结果与仿真结果吻合较好，验证了所提设计方法的有效性。