The experimental realization of a multiple-input, multiple-output (MIMO) metastructure for antenna beamforming is reported. The metastructured beamformer is designed using a recently reported computational inverse design procedure that significantly reduces the required time and computational resources needed to design MIMO metastructures. This reduction in time and resources is achieved by circumventing full-wave simulations to evaluate device responses and using the adjoint variable method to evaluate gradients. To experimentally verify the MIMO metastructure’s performance, the beamformer is patterned on a microwave substrate and interfaced with a 3D-printed aperture antenna to form a multibeam antenna. Measurement results for the multibeam antenna’s performance are provided.

中文翻译：

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具有多输入、多输出元结构的天线波束形成：控制天线孔径场的幅度和相位


报告了用于天线波束成形的多输入多输出（MIMO）元结构的实验实现。元结构波束形成器采用最近报道的计算逆向设计程序进行设计，可显着减少设计 MIMO 元结构所需的时间和计算资源。这种时间和资源的减少是通过绕过全波模拟来评估设备响应并使用伴随变量方法来评估梯度来实现的。为了通过实验验证 MIMO 元结构的性能，波束形成器在微波基板上进行图案化，并与 3D 打印孔径天线连接以形成多波束天线。提供了多波束天线性能的测量结果。