A terahertz power combining frequency multiplier source based on waveguide magic‐T divider

Summary This paper proposes a high‐power solid‐state power combining frequency multiplier source based on a waveguide magic‐T divider. The magic‐T has the merits of high isolation and reliability compared to conventional Y/T junction power dividers and wider bandwidth compared to 3 dB couplers. In the waveguide magic‐T, a two‐stage cuboid ridge is employed to reduce the difference‐port reflection and act as a matching element for the improved isolation port. Furthermore, two bent waveguides are connected with the output port of the magic‐T, which can achieve phase congruence. The reliability of the solid‐state power combining multiplier can be enhanced by this low‐loss, high‐isolation power divider. Moreover, the divider also facilitates the realization of a high‐power frequency multiplier. Measured results show that the multiplier has a maximum output power of 90.3 mW at 178 GHz with an input power of 448 mW.