Wireless Communications of Resonant Tunneling Diode Transmitter and Receiver at 860 GHz

To meet the growing need for higher data rates with improved energy efficiencies, this article demonstrates the application of resonant tunneling diodes (RTDs) for wireless communications at a frequency of approximately 860 GHz. By incorporating a low-loss air-bridge transmission line to form a cavity resonator and a ring-slot antenna, a two-RTD oscillator realized coherent terahertz radiation with a power output of 0.23 mW and a dc-to-RF efficiency of 0.2%. Experimental validation confirmed wireless data transmission for data rates up to 1.2 Gbit/s using on-off keying modulation with bit error rates below 10⁻⁹. To the best of our knowledge, this is the first reported demonstration of all-electronic oscillators for wireless communication beyond 850 GHz, paving the way for next-generation networks and advanced integrated circuits in the artificial intelligence-driven era.