In this work, a beam-steering array antenna for pattern stabilisation is presented. The antenna element consists of two layers with a unique structure of microstrip to coplanar waveguide (CPW) transition to cover a frequency range from 20 to 30 GHz and a stable pattern at all operating frequencies. To increase the gain of the antenna element, an elliptical broadband Fabry–Perot cavity structure is used. The element manages 3 dB gain bandwidth of almost 23–26 GHz with a 14.4 dBi peak. In addition, a modified Butler matrix consisting of two 90° and two 135° couplers without phase shift section is used to attain a stable pattern. The proposed Butler matrix performs a stationary phase with a phase error of less than ±6° over a frequency band from 21 to 29 GHz. The integration of the proposed element and feed network leads to a beam-tilting antenna capable of managing its patterns through the input ports in the operating frequency range of 20–29.5 GHz (9.5 GHz) and 20.6–29.6 GHz (9 GHz) for ports 1 and 2, respectively.

中文翻译：

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具有FP领结缝隙天线元件的波束控制高增益阵列天线，用于模式稳定

在这项工作中，提出了一种用于方向图稳定的波束控制阵列天线。天线元件由两层组成，这两层具有从微带到共面波导（CPW）过渡的独特结构，可覆盖20至30 GHz的频率范围，并且在所有工作频率下均具有稳定的方向图。为了增加天线元件的增益，使用了椭圆形宽带Fabry-Perot腔结构。该元件可管理约23–26 GHz的3 dB增益带宽，峰值为14.4 dBi。另外，使用由两个90°和两个135°耦合器组成且没有相移部分的改进的Butler矩阵来获得稳定的图案。所提出的巴特勒矩阵在21至29 GHz的频带上执行相位误差小于±6°的固定相位。