Wideband Waveguide-to-differential-line Transition with Slots and Back-short in Multilayer Substrate

This paper proposes a wideband waveguide-to- differential-line transition with slots and a back-short structure for use in 300-GHz band. Slots and a back-short structure are formed in a multilayer substrate to create a double resonance. By controlling these resonant frequencies, a transition with wide bandwidth of low-loss connection can be obtained. As a result of the optimization, the simulated bandwidths were 107.5 GHz for reflection lower than −10 dB and 131.9 GHz for transmission higher than −3 dB.