A Novel Wideband Transition from Substrate Integrated Waveguide to Rectangular Waveguide

Aim: In this article, wideband Substrate Integrated Waveguide (SIW) and rectangular waveguide (RWG) transition operating in Ka-band is proposed. Objective: To design wideband Substrate Integrated Waveguide (SIW) and rectangular waveguide (RWG) transition operating in Ka-band. Method: The coupling patch was etched on the SIW cavity to couple the electromagnetic energy from SIW to RWG. Moreover, metasurface was introduced into the radiating patch to enhance bandwidth. To verify the functionality of the proposed structure back to back transition was designed and fabricated on a single layer substrate using standard Printed Circuit Board (PCB) fabrication technology. Results: Measured results match with the simulation results, measured insertion loss was less than 1.2 dB and return loss was better than 3 dB for the frequency range of 28.8 to 36.3 GHz. By fabricating transition with 35 SRRs, bandwidth of the proposed transition can be improved. Conclusion: The proposed transition has advantages like compact size, easy to fabricate, low cost and wide bandwidth. The proposed structure is a good candidate for millimeter-wave circuits and systems.