This paper presents the design and analysis of a rectangular slot antenna for producing a directional radiation pattern over a wide bandwidth of 6–9 GHz. A basic wideband slot antenna is designed for the desired frequency band by microstrip offset feed technique. This antenna is then loaded with a superstrate and a reflector, both made of conducting sheets. Analogous to a three-element Yagi antenna, the superstrate enhances the boresight gain, while the reflector improves the front-to-back ratio (FBR) of the basic slot antenna. The antenna is optimized for superior wideband performance with boresight gain ≥5 dBi, peak cross-pol level ≤−10 dB and FBR ≥10 dB, over the −10 dB impedance band of 6–9 GHz, which in this paper is termed as the radiation bandwidth. Prototype measurement demonstrates a radiation bandwidth of 6.05–8.22 GHz (or 30.41%), which is in decent agreement with the simulation.

中文翻译：

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一种矩形缝隙天线，具有完美导电的覆板和反射板，可在 6-9 GHz 频段提供出色的辐射

本文介绍了矩形缝隙天线的设计和分析，用于在 6-9 GHz 的宽带宽上产生定向辐射图。通过微带偏置馈电技术，为所需频段设计了一个基本的宽带缝隙天线。然后，该天线装有一个覆板和一个反射器，两者均由导电片制成。类似于三元八木天线，覆板提高了视轴增益，而反射器提高了基本缝隙天线的前后比 (FBR)。该天线针对卓越的宽带性能进行了优化，在 6-9 GHz 的 -10 dB 阻抗带上，视轴增益 ≥5 dBi，峰值交叉极化电平 ≤-10 dB 和 FBR ≥10 dB，在本文中称为辐射带宽。原型测量表明辐射带宽为 6.05–8.22 GHz（或 30.41%），