A broadband magic-T junction for millimeter-wave applications is proposed in this article. Gap waveguide technology is employed to overcome fabrication and assembly challenges at millimeter-wave frequencies. The measured results for a fabricated prototype are in good agreement with the simulations. The measurements indicate that the fabricated structure exhibits 28% impedance bandwidth and isolation better than 69 dB between E- and H-arms in the Ka-band. In addition, the measured coupling level between the collinear arms is less than −18.6 dB. The proposed structure is compact and simple, has high power and low loss, and is suitable for low-cost fabrication to utilize in a wide variety of millimeter-wave and microwave applications.

本文提出了一种用于毫米波应用的宽带幻 T 结。间隙波导技术用于克服毫米波频率下的制造和组装挑战。制造原型的测量结果与模拟非常吻合。测量结果表明，制造的结构表现出 28% 的阻抗带宽和隔离度优于 Ka 波段中 E 和 H 臂之间的 69 dB。此外，测得的共线臂之间的耦合电平小于 -18.6 dB。所提出的结构紧凑简单，具有高功率和低损耗，适用于低成本制造，可用于各种毫米波和微波应用。