Assembly Convenient W-Band Waveguide Magic-T

This letter proposes a waveguide Magic-T operating in the
$W$
-band, aiming to overcome the assembly difficulties of conventional configuration. Its primary characteristic is that it allows for the one-piece fabrication of the waveguide cavity using popular computer numerical control (CNC) technology, avoiding the assembly of extra matching elements. Second, the four ports of the Magic-T share a horizontal plane, which allows its lid to theoretically be a flat plate. This overcomes the assembly misalignment challenge, due to the presence of port in the lid of some conventional Magic-T. In addition, the use of bed-of-nails to package this Magic-T was investigated to further alleviate the difficulty of assembly. A prototype has been fabricated and measured, and the results indicated excellent overall performance over the entire 75–110-GHz range, including low loss, high isolation, and good amplitude/phase consistency.