This letter presents a compact, wideband, planar, E-arm folded magic tee at $Ku$ -band for monopulse slotted waveguide antenna array applications. A novel impedance matching structure, an L-shaped septum, is implemented at the magic tee junction, which results in wide impedance bandwidth at all ports. The height of this septum is the same as that of the waveguide height, which allows the design to be very compact. An impedance bandwidth of 22% is achieved for a return loss of 20 dB. The magic tee is manufactured using a high-precision electric discharge machining (EDM) process and followed by the integration of subparts using silver epoxy bonding. Simulation and measured results are compared. Measured amplitude balance of < 0.1 dB, phase balance of <2°, and isolation of better than −35 dB have been achieved. The proposed design is a good technique for the design of broadband, miniaturized monopulse comparators for monopulse antenna array applications.

中文翻译：

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适用于单脉冲天线阵列应用的紧凑型宽带平面魔术三通

这封信提出了一个紧凑的，宽带的，平面的，E臂折叠式魔术T恤，位于 $ Ku $ 用于单脉冲缝隙波导天线阵列应用的宽带。魔术三通处实现了一种新型的阻抗匹配结构，即L形隔片，从而在所有端口上实现了宽阻抗带宽。该隔片的高度与波导高度相同，这使得设计非常紧凑。对于20 dB的回波损耗，可获得22％的阻抗带宽。魔术三通使用高精度放电加工（EDM）工艺制造，然后使用环氧银粘接剂将子零件集成在一起。比较仿真结果和测量结果。已实现了<0.1 dB的测量幅度平衡，<2°的相位平衡以及优于-35 dB的隔离度。提出的设计对于宽带设计是一种很好的技术，