提出并实现一种基于双层微带结构的新型8×8 Butler矩阵.利用双层微波电路结构将器件分置于上下层以省略跨接器；采用两段近似λ(g)/8阶梯耦合微带线Schiffman结构实现宽频带移相；采用三分支线定向耦合器作为宽带电桥.采用该方法设计并实现工作于C波段的8×8 Butler矩阵样品；实测结果表明,其可在(4.2～5.3)GHz范围内实现各端口回波损耗不大于10dB、端口隔离不小于17dB、功分比误差不超过±1.5dB、相位误差不大于±12°等指标,实测平均插入损耗约2.5dB.新型Butler矩阵较之采用跨接器的经典结构损耗小,更加适用于较大规模多波束成型网络.%A kind of novel 8 x8 Butler matrix based on multi-layer substrate structure is presented and realized. A bilayer substrate structure is adopted to distribute components into the up and down layer to replace crossover. Two approximate λg/8 stepped coupling microstrip Schiffman phase shifter is used to realize wideband phase shift. A three-branch line coupler is employed as wideband bridge. An 8×8 Butler matrix sample working in C band frequency is designed and fabricated. The measured results indicate that in the frequency range over (4. 2~5.3) GHz, the return loss of each port is better than -l0dB, the isolation is better than 17dB, the distribution error is less than ±1dB, the phase error is less than ±12° and the measured average insert loss is about 2. 5dB. Compared with conventional structure with crossover , the novel Butler matrix has lower loss and better adaptability to large scale multi-beam forming network.
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