In this letter, a broadband waveguide magic-T with compact size is presented. A grounded suspended stripline has been used to obtain broadband isolation characteristics and increase power capacity. The inner ridge-matching structure is used to achieve broadband matching. The method and design process of the demonstrated magic-T are described in detail. The measured 15-dB bandwidth is about 30.3%, almost for waveguide BJ-320 waveguide operating bandwidth. The measured isolation between sum and deference ports is above 37.5 dB; 20-dB measured isolation is achieved between collinear ports. The measured and simulated results are in good agreement. It has advantages in high-power applications.

中文翻译：

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具有紧凑型内脊匹配的宽带 Ka 波段波导 Magic-T

在这封信中，介绍了一种尺寸紧凑的宽带波导 magic-T。已使用接地的悬空带状线来获得宽带隔离特性并增加功率容量。内脊匹配结构用于实现宽带匹配。详细描述了演示的magic-T的方法和设计过程。实测15-dB带宽约为30.3%，几乎为波导BJ-320波导工作带宽。总和端口和差端口之间的测量隔离度高于 37.5 dB；在共线端口之间实现了 20 dB 的测量隔离度。测量结果和模拟结果非常吻合。它在大功率应用中具有优势。