A 3-D printed E-plane waveguide magic-T using air-filled coax-to-waveguide transitions

Cheng Guo, Jin Li, Yang Yu, Fan Zhang, Yujian Zhu, Qian Yang, Weijun Zhu, Shitao Zhu, Xiaobang Shang, Yang Gao, Yi Wang, Guan-long Huang, Qingsha S. Cheng, Anxue Zhang

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This article reports on a new class of broadband and fully 3-D printed E-plane coax-to-waveguide transition and a monolithically 3-D printed waveguide magic-T based on the transition. The transition is constructed by a section of air-filled rectangular coaxial transmission line (TL) that is placed between two broadband coax-to-waveguide probe transitions. It is used to interconnect the magic-T's sum port and the waveguide T-junction. The incorporation of the transition reorients all the waveguide arms of the magic-T into the E-plane. Some X-band prototypes of the proposed transition and the magic-T are designed and implemented. Polymer-based additive manufacturing and copper electroplating techniques are employed to monolithically fabricate each prototype. The transition and the magic-T exhibit broadband and low-loss characteristics from 8.2 to 12.4 GHz with the measured performance well matched with the simulations. In addition, the power handling capability (PHC), including the peak PHC (PPHC) and the average PHC (APHC), of the magic-T is evaluated by simulations, showing that the proposed magic-T could handle 100 W of APHC.
Original languageEnglish
Pages (from-to)4984-4994
Number of pages11
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number12
Early online date5 Nov 2019
Publication statusPublished - Dec 2019


  • Waveguide transitions
  • Planar waveguides
  • Probes
  • Rectangular waveguides
  • Waveguide components
  • Broadband communication


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