Sub-Terahertz Resonant Tunneling Diode Oscillators with High Output Power (∼200 µW) Using Offset-Fed Slot Antenna and High Current Density

We demonstrate the operation of resonant tunneling diode (RTD) oscillators with high output power (100–200 µW) at frequencies of 430–460 GHz using an offset-fed slot antenna in which the RTD is placed at a certain distance from the center of the slot. The highest output power obtained in this study was 200 µW at 443 GHz for a single RTD with a peak current density of 18 mA/µm2; the RTD was placed 45 µm from the center of a 100-µm-long antenna. Higher output is expected by optimizing the position and mesa area of the RTD and the antenna length.