Ultra-lightweight deployable antennas with high-gain are pivotal communication components for small satellites, which are intrinsically constrained in size, weight, and power. In this work, we design and demonstrate metasurface-based ultra-lightweight flat off-axis reflectarrays for microwave beam collimation and focusing, similar to a parabolic dish-antenna. Our ultra-thin reflectarrays employ resonators of variable sizes to cover the full 2π phase range, and are arranged on the metasurface to realize a two-dimensional parabolic focusing phase distribution. We demonstrate a 30° off-axis focusing reflector that exhibits a measured gain of 27.5 dB at the central operating frequency of 11.8 GHz and a 3 dB directionality <[Formula: see text]1.6°. Furthermore, we carry out full-wave simulations of the reflectarray, showing high gain of the beam focusing/collimation functionality, in good agreement with measurements. The demonstrated reflectarrays will enable low-cost, lightweight, and high-gain deployable transceivers for small-satellite platforms.

中文翻译：

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基于超表面的超轻量高增益离轴平面抛物面反射阵列，用于微波准直/聚焦。

具有高增益的超轻型可部署天线是小型卫星的关键通信组件，其本质上受大小，重量和功率的限制。在这项工作中，我们设计并演示了基于抛物面的超轻型平板离轴反射阵列，用于微波光束的准直和聚焦，类似于抛物面碟形天线。我们的超薄反射阵列采用可变大小的谐振器来覆盖整个2π相位范围，并布置在超表面上，以实现二维抛物线聚焦相位分布。我们演示了一个30°偏轴聚焦反射器，该反射器在11.8 GHz的中心工作频率下具有27.5 dB的测量增益，方向性<3 [dB]：1.6°。此外，我们对反射阵列进行全波仿真，显示出光束聚焦/准直功能的高增益，与测量结果非常吻合。演示的反射阵列将为小型卫星平台实现低成本，轻量级和高增益可部署收发器。