Broadband Conductor Backed-CPW with Tapered Microstrip Line to Corrugated Via Wall-SIW Transition for Different-Bands (2–40 GHz)

Abstract

This paper proposes the Corrugated Via-Wall Substrate Integrated Waveguide (CVWSIW) (with enhanced performance compared to the traditional SIW) and the transitions to this newly proposed CVWSIW from a conductor-backed coplanar waveguide (CB-CPW). The CB-CPW slot lines and the gap between two metallic via rows play a prominent role in widening the bandwidth and reducing the loss. The CB-CPW-CVWSIW transition is initially designed in the 4–8 GHz (C-band) range. Following the same design procedure, the transitions are made for other five different bands to cover the frequencies from 2 to 40 GHz. Improved performance in terms of bandwidth, insertion loss, and total loss is the benefit of the designed transitions with the proposed CVWSIW. Laboratory prototypes of the transitions are fabricated and experimentally measured to cross verify the simulation results. The measured results show, for example, the minimum return loss of 15 dB, maximum insertion loss of 0.36 dB, and fractional bandwidth of 62.16% for C-band.