Design Of A 220 GHz Fourth-harmonic Mixer Based On Schottky Diode

In this paper, a 220 GHz fourth-harmonic mixer was designed based on Schottky diode. The structure of multistage reduced height waveguide has been used to expand the bandwidth. On the basis of the common sub-harmonic mixer, this mixer further reduces the required frequency of the LO source. According to the simulation results, the frequency range of RF is 200-240 GHz. When the IF is 1GHz, the conversion loss of single sideband (SSB) is better than 13 dB. In the range of 202-237 GHz, the conversion loss is better than 11.5 dB, and the best value is 10.66 dB.