X‐band right‐angle coaxial‐to‐single ridge waveguide compact transition with capacitive coupling

A novel right‐angle coaxial‐to‐single ridge waveguide transition with capacitive coupling is presented at X band. Contrarily to the state of the art, the coaxial inner conductor is not in DC contact with the ridge, and such a feature can be a considerable mechanical advantage in the manufacturing of high‐performance systems. In addition to this, few geometrical parameters need to be optimised, thus simplifying the overall design with respect to traditional counterparts. Nevertheless, the whole X band can be potentially covered with a return loss better than 20 dB. An ultra‐compact transition is designed, manufactured with stereolithography technology and tested in a back‐to‐back configuration. Good agreement between simulated and measured results is observed for a proof‐of‐concept prototype.