Design and application of the orthogonal feature of TE10 mode and slotline mode in substrate integrated hybrid multichannel signaling systems

Substrate integrated waveguide (SIW) has received extensive attention as an efficient medium for signal transmission since its inception. In this paper, a substrate integrated hybrid circuit (SIHC) is proposed as a promising multichannel interconnect structure, which is constructed by a substrate integrated waveguide (SIW) and a slotline etched on its broadside conductor layer. Such a structure utilizes the orthogonal feature of TE₁₀ mode supported by SIW structure and slotline mode supported by slotline structure to generate two uncoupled channels without additional physical links. Furthermore, transition structures are designed and optimized for practical applications. The proposed SIHC has low insertion loss and excellent crosstalk. Broadband frequency reuse is firstly achieved in substrate integrated multimode channels.