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

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. This paper presents a novel power combining frequency multiplier source based on a waveguide magic-T divider. The divider is more reliable than the conventional Y/T junction and has a wider bandwidth than the conventional 3 dB couplers. These features contribute to the multiplier's reliability and considerable performance. image