High-Power Stripline-to-Double-Ridge-Waveguide Transition With 3:1 Bandwidth

In this article, a novel design for ultrawideband transition is presented to connect double ridge waveguide and stripline technology. The introduced structure contains a Teflon seal that holds an inner conductor connecting the double ridge with the middle strip of the stripline configuration. This pin is shaped to ensure the mechanical stability of the structure as well as achieve a deep matching level. The proposed transition has a 100% fractional bandwidth covering the band from 6 to 18 GHz. This is an extended bandwidth for the WRD650 standard double ridge waveguide. The single transition matching level achieved beyond -25 dB, while the back-to-back transition has a matching level below -18 dB. In addition, a comprehensive power analysis has been conducted, revealing that the proposed transition demonstrates remarkable power-handling capabilities, with a maximum power threshold of 2.5 kW, making it highly suitable for high-power microwave applications. The proposed structure is fabricated and measured, where the measured response has a very good agreement with the simulated one.