A novel wideband resonant cavity antenna (RCA) with compact partially reflective surface (PRS) is presented, which is composed of a superstrate and a feed antenna. The superstrate is a dielectric slab with double-deck periodic array structure, where the superstratum is composed of square loop cells and substratum is composed of square loop aperture cells. This shows positive reflection coefficient phase, which in turn helps in obtaining wider RCA bandwidth. Contrary to the patch cell periodic array, a periodic array composed of square loop cells provides further compact structure. The feed system is a wideband aperture-coupled patch antenna, which is composed of square patch, ground plane with I-shaped slot, and fork-shaped feed network. This dual-arm feed network helps in obtaining the maximum gain at the center frequency. The superstrate with positive reflection coefficient phase provides the minimum gain at the resonant frequency. This in turn helps RCA in obtaining invariant gain in the operation band. Experimental verification was performed and the results show that this RCA offers fractional bandwidth of around 23.6% at $X$ -band (8.88–11.25 GHz, S11 ≤ −10 dB) and gain (13.36–13.92 dBi) is almost invariant over the bandwidth. The measured patterns are symmetric with low cross-polarization levels.

中文翻译：

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一种具有紧凑部分反射面的宽带谐振腔天线

提出了一种具有紧凑部分反射面（PRS）的新型宽带谐振腔天线（RCA），它由覆盖层和馈电天线组成。上层为双层周期阵列结构的介质板，上层由方形环孔单元组成，底层由方形环孔单元组成。这显示了正反射系数相位，这反过来有助于获得更宽的 RCA 带宽。与贴片单元周期阵列相反，由方形环单元组成的周期阵列提供了更紧凑的结构。馈电系统为宽带孔径耦合贴片天线，由方形贴片、带工字槽的地平面和叉形馈电网络组成。这种双臂馈电网络有助于在中心频率处获得最大增益。具有正反射系数相位的覆层在谐振频率处提供最小增益。这反过来又有助于 RCA 在操作频带中获得不变增益。进行了实验验证，结果表明该 RCA 在 $X$ 频段（8.88-11.25 GHz，S11 ≤ -10 dB）下提供约 23.6% 的部分带宽，并且增益（13.36-13.92 dBi）在整个带宽范围内几乎不变. 测量的图案是对称的，具有低交叉极化水平。92 dBi) 在带宽上几乎是不变的。测量的图案是对称的，具有低交叉极化水平。92 dBi) 在带宽上几乎是不变的。测量的图案是对称的，具有低交叉极化水平。