Substrate-integrated waveguide transitions to planar transmission-line technologies

For the purpose of integrating active, nonlinear and surface-mount components in substrate-integrated waveguide (SIW) technology, this paper presents a variety of new and modified transitions from SIW to other planar transmission lines. Typical performances are shown involving connections to microstrip, coplanar waveguide (both conductor-backed and regular), coplanar strip line and slot line technologies. Both modified and new transition examples in the 18 – 27 GHz range demonstrate the feasibility of such interfaces for bandwidths in the order of 40 percent. Measurements and full-wave simulations validate the proposed designs.