A 300-330 GHz Frequency Tripler with >100mW Output and >17% Efficiency Based on Face-to-face Topology and Enhanced Diode Configuration

We reports on the design, fabrication and measurements of a solid-state frequency tripler with an output power > 100mW above 300GHz at room temperature. This tripler benefits from balanced face-to-face differential topology and improved diode configuration, providing quadruple power handling capabilities and excellent multiplication efficiency compared to traditional approaches. The improved diode configuration features a novel dual-row 12-anode architecture and has been integrated with peripheral circuit by terahertz monolithic integrated circuit process. At room temperature, the fabricated tripler demonstrates an average output power exceeding 82 mW and a corresponding conversion efficiency over 13.7% for a nominal input power of around 500–800 mW across 300-330 GHz band. Prominently, this tripler can deliver an ultra-high output power > 100 mW and an average efficiency >17% in the 306-317 GHz range, with a maximum power of 112.7 mW and a peak conversion efficiency of 19% for a 592-mW input power at 310.5 GHz.