High-data rate communications in the range of 100 Gbps require handling larger RF bandwidths in frequency bands beyond 100 GHz. The architecture of the transceiver should be reconsidered compared with classical approaches in order to optimize the power consumption. Channel bonding architectures combine relatively low baseband bandwidth inputs with power combining and up-conversion stages in order to obtain a large bandwidth at RF. In this paper, some implementations of energy efficient transceivers using this operating principle at D-band (around 140 GHz) will be presented. Wireless communications and plastic waveguide links are demonstrated with data rates of several tens of Gbps and energy consumption in the order of a few tens of pJ/bit.