In this letter, a rectangular-cavity-like structure is proposed to feed the phase gradient metasurface (PGM), where two symmetrical long slots are cut on side walls along wave propagation direction of the rectangular waveguide cavity resonator. It consists of rectangular waveguide, transition section, slotted-waveguide feed section, and shorted end of the cavity. The PGMs are placed in the slotted-waveguide section and the slot is wide enough to accommodate PGMs. The antenna prototype is fabricated and measured whose measurements agree well with simulations in 7.8–11.0GHz.

中文翻译：

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用于相位梯度超表面辐射的矩形腔状馈源

在这封信中，提出了一种矩形腔状结构来馈送相位梯度超表面（PGM），其中两个对称的长槽沿矩形波导腔谐振器的波传播方向在侧壁上切割。它由矩形波导、过渡段、开槽波导馈入段和腔的短端组成。PGM 放置在开槽波导部分，槽的宽度足以容纳 PGM。天线原型是制造和测量的，其测量结果与 7.8-11.0GHz 的模拟非常吻合。