High-efficiency tunable Y-branch power splitters at terahertz frequencies

Terahertz Y-branch power splitters formed by one-way waveguide are investigated theoretically. For such splitters, there exists no backward reflection from the Y-junction region for incident waves because the input channel supports no backward-propagating mode, therefore the transmission efficiency is perfect in the lossless case. Moreover, by varying the applied external magnetic field, the power splitting ratio of the splitters can be tunable for a given frequency, and required (equal or unequal) splitting ratio can also be achieved over a wide frequency band.