Compact Leaky SIW Feeder Offering TEM Parallel Plate Waveguide Launching

Victoria Gomez-Guillamon Buendia, Symon Podilchak, Davide Comite, Paolo Baccarelli, Paolo Burghignoli, José Luis Gómez-Tornero, George Goussetis

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)
74 Downloads (Pure)


A planar and low-cost parallel-plate waveguide (PPW) launcher based on substrate integrated waveguide (SIW) technology is proposed. It can launch the fundamental TEM mode with a collimated wave front into a PPW structure while also being low profile and easy to fabricate. The launcher is implemented using a network of SIW transmission lines and its design is based on the leaky-wave (LW) theory. In our proposed structure, a selection of the SIW lines is made to leak power into the desired PPW region by means of a partially reflective surface, enabling planar wave front propagation of the TEM mode where efficiency values of over 90% are achieved. Measurements of a fabricated prototype are also reported at 15 GHz to demonstrate the design procedure and validate structure operation. When compared with similar co-axial and metallic waveguide launchers, our proposed SIW structure represents a compact, integrated, and unique design solution which may be useful to feed planar parallel-plate slot arrays and end-fire antennas. In addition, our novel and simple approach for PPW excitation can also be applied to other parallel-plate-based guides, low-cost transitions, and compact dividing/combining circuits for a new antenna and non-radiating LW feed systems at microwave and millimeter-wave frequencies.
Original languageEnglish
Pages (from-to)13373-13382
Number of pages10
JournalIEEE Access
Early online date21 Jan 2019
Publication statusPublished - 2019


  • Feeding network
  • TEM mode
  • leaky-waves (LWs)
  • parallel-plate waveguide (PPW)
  • substrate integrated waveguide (SIW)

ASJC Scopus subject areas

  • Computer Science(all)
  • Materials Science(all)
  • Engineering(all)


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