Microelectronic package communications are described that use radio interfaces that are connected through waveguides. One example includes an integrated circuit chip, a package substrate to carry the integrated circuit chip, the package substrate having conductive connectors to connect the integrated circuit chip to external components, and a radio on the package substrate coupled to the radio chip to modulate the data over a carrier and to transmit the modulated data. A waveguide connector is coupled to a dielectric waveguide to receive the transmitted modulated data from the radio and to couple it into the waveguide, the waveguide carries the modulated data to an external component.