Sub-Terahertz Resonant Tunneling Diode Oscillators with High Output Power (similar to 200 mu W) 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 mu W) 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 mu W at 443 GHz for a single RTD with a peak current density of 18 mA/mu m(2); the RTD was placed 45 mu m from the center of a 100-mu m-long antenna. Higher output is expected by optimizing the position and mesa area of the RTD and the antenna length. (C) 2010 The Japan Society of Applied Physics