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 in another five different bands for working frequencies up 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 that the minimum return loss of 15 dB, maximum insertion loss of 0.36 dB, and fractional bandwidth of 62.16% for C-band