RTD oscillators at 430–460 GHz with high output power (~200 µW) using integrated offset slot antennas

We demonstrated the operation of GaInAs/AlAs 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 was placed 45 μm from the center of a 100-μm-long antenna. 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/μm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . The output powers of 50-130 μW at frequencies of 460-490 GHz were also obtained in the oscillators with different structure. Higher output is expected by optimizing the position and mesa area of the RTD and the antenna length.