4.6 Article

Broadband Coplanar Waveguide to Air-Filled Rectangular Waveguide Transition

Journal

ELECTRONICS
Volume 11, Issue 7, Pages -

Publisher

MDPI
DOI: 10.3390/electronics11071057

Keywords

CPW; rectangular waveguide; broadband transition

Funding

  1. China Postdoctoral Science Foundation [2018M633666]
  2. Natural Science Foundation of Hunan Province [2019JJ50392]
  3. Opening fund of State Key Laboratory of Millimeter Waves [K202116]
  4. Scientific Research Fund of Hunan Provincial Education Department [17B160]
  5. Hunan College Students' innovation and entrepreneurship training program [2020-2163]

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This article introduces a novel transition between coplanar waveguide (CPW) and air-filled rectangular waveguide (RWG), which broadens the bandwidth. The design does not require intermediate transition or air-bridges, and the planar circuit can be designed with high- and low-permittivity materials, offering more benefits in both PCB and MMIC design. Measurement results agree well with simulation results, validating the feasibility of this design.
This article introduces a novel transition between coplanar waveguide (CPW) and air-filled rectangular waveguide (RWG). A rectangular radiator etched with a semi-elliptic slot is connected to the center conductor of CPW to realize the transition, which broadens the bandwidth. This direct transition does not require intermediate transition or air-bridges. Moreover, the planar circuit of the transition can be designed with high- and low-permittivity materials (epsilon(r) = 10.2 and 2.22), which offer more benefits in both PCB and MMIC design. Two back-to-back transition prototypes at X-band are designed, fabricated and measured. The 15 dB fractional bandwidths are expanded to 44.7% and 47.6% respectively, which have been demonstrated in both of the transitions (epsilon(r )= 10.2 and 2.22). The measurement results agree well with simulation results, which validate the feasibility of this design.

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