A 320-340 GHz Single Sideband Mixer With Integrated Pseudoelliptic Waveguide Filters

In this paper, a 320-340 GHz Schottky diode based subharmonic mixer with integrated pseudoelliptic waveguide filter is proposed. The by-pass coupling filter in the RF waveguide is developed to generate a transmission zero (TZ) in the lower sideband (LSB) to significantly improve the image rejection. Furthermore, the impedance matching is also achieved directly by RF filter. The proposed mixer exhibits a single sideband conversion loss of 10-14 dB in the upper sideband, a sideband rejection ratio better than 25 dB, which are all in good with the simulations. This single sideband (SSB) mixer has a great potential in 330 GHz communication system with a 20 GHz intermediate frequency (IF) bandwidth.