Some embodiments herein relate to a transmitter. The transmitter includes an integrated circuit (IC) package including a first antenna configured to radiate a first electromagnetic signal therefrom. A printed circuit board (PCB) substrate includes a waveguide configured to receive the first electromagnetic signal and to generate a waveguide signal based thereon. A second antenna can be electrically coupled to the waveguide and can radiate a second electromagnetic signal that corresponds to the waveguide signal. Other devices and methods are also disclosed.