Design and Characterization of 1.8–3.2 THz Schottky-Based Harmonic Mixers

Berhanu T. Bulcha, Jeffrey L. Hesler, Vladimir Drakinskiy, Jan Stake, Alex Valavanis, Paul Dean, Lianhe H. Li, N. Scott Barker
2016 IEEE Transactions on Terahertz Science and Technology  
A room-temperature Schottky diode-based WM-86 (WR-0.34) harmonic mixer was developed to build high-resolution spectrometers, and multipixel receivers in the terahertz (THz) region for applications such as radio astronomy, plasma diagnostics, and remote sensing. The mixer consists of a quartz-based local oscillator (LO), intermediate-frequency (IF) circuits, and a GaAs-based beam-lead THz circuit with an integrated diode. Measurements of the harmonic mixer were performed using a 2 THz
more » ... source and 2.6906 THz QCL. A conversion loss of 27 dB for the third harmonic mixing and a conversion loss of 30 dB for the fourth harmonic mixing were achieved. This is the first development of a wideband WM-86 (WR-0.34) harmonic mixer with a planar Schottky diode integrated on a beam-lead THz circuit that uses a lower LO harmonic factor for 1.8-3.2 THz RF frequency. Furthermore, this result represents the best Schottky-based mixer in this frequency range.
doi:10.1109/tthz.2016.2576686 fatcat:j4sbjvvxkfavzafoy3larygmh4