Terahertz bands are essential for next‐generation wireless communications, offering ultrabroad bandwidth and unprecedented data throughput. However, realizing compact, low‐cost, broadband, and efficient terahertz transceiver modules remains challenging. Conventional modules that rely on metallic hollow‐waveguide or silicon‐lens packaging suffer from signal loss, bulkiness, and fabrication complexity. Here, we propose a compact terahertz wireless transceiver module enabled by a resonant tunneling diode (RTD) integrated with a photonic‐electronic antenna chain. The RTD, grown on an InP substrate, is coupled to a modified Vivaldi antenna functioning as a broadband mode converter to an all‐silicon effective‐medium‐clad dielectric waveguide, which terminates with a rod antenna directly interfaced with a three‐dimensional (3D)‐printed cyclic olefin copolymer elliptical lens. This configuration enables ultrabroadband and highly directive free‐space radiation without additional matching networks or anti‐reflection coatings. Encased in a low‐cost 3D‐printed polylactic acid package, the module attains realized gains of 28–33 dBi for the mode and 30–33 dBi for the mode across 220–330 GHz. As a receiver, the module exhibits a noise voltage density down to , a minimum noise equivalent power of 1.8 , and an average responsivity of 6.8 kV/W in the 300‐GHz band under amplified detection. It supports error‐free transmission (bit error rate (BER) less than ) up to 30 Gbit/s for on–off keying (OOK) modulation and 80 Gbit/s (BER below hard‐decision forward error correction limit) for 16‐QAM modulation over 10 cm and enables real‐time uncompressed high‐definition video streaming over 1 m. As a transmitter, the module is demonstrated to support OOK transmission at 332 GHz, achieving error‐free transmission up to 12 Gbit/s. These results establish a compact, lightweight, and multifunctional terahertz transceiver architecture, highlighting the potential of RTD‐based photonic‐electronic integration for 6G and beyond wireless frontends.
Gao et al. (Wed,) studied this question.