The systems and methods described herein provide a traveling wave launcher system physically and communicably coupled to a semiconductor package and to a waveguide. The traveling wave launcher system includes a slot-line signal converter and a tapered slot launcher. The slot-line signal converter may be formed integral with the semiconductor package and includes a balun structure that converts the microstrip signal to a slot-line signal. The tapered slot launcher is communicably coupled to the slot-line signal converter and includes a first plate and a second plate that form a slot. The tapered slot launcher converts the slot-line signal to a traveling wave signal that is propagated to the waveguide.