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传输阵包含接收阵面和再辐射阵面,各由周期排列的单元组成,两个阵面被公共接地板隔开,经由过孔销钉或槽缝相耦合。接收阵面接收发自馈源的球面波,经校正相位并传向再辐射阵面以实现前向辐射。文中提出了两种宽频带正交极化变换的传输阵单元:直接耦合角馈层叠式贴片和近轴耦合U型缝贴片,分别组成相同的接收阵面和再辐射阵面,根据宽频带阻抗匹配的要求,对这两种单元进行了优化设计。然后,采用延迟线实现相位调节,分别设计了37和21个单元的正交线极化变换传输阵,对样品整体仿真结果显示了它们的宽频带、高增益和低交叉极化电平的优良性能。
The transmission array includes a receiving front and a re-radiation front, each of which is made up of periodically arranged cells separated by a common ground plane and coupled via via pins or slots. The receiving fronts receive the spherical waves from the feed source, correct the phase and transmit to the re-radiation fronts to achieve forward radiation. In this paper, two kinds of wideband orthogonally polarized transmission array elements are proposed: direct-coupled corner-fed cascaded patch and paraxial-coupled U-shaped patch, which form the same receiving front and re-radiation front respectively. With impedance matching requirements, these two units have been optimized. Then, the delay line is used to adjust the phase, and 37 and 21 units of orthogonally polarized transmission matrixes are designed respectively. The overall simulation results show that their broadband, high gain and low cross-polarization level are excellent performance.