A Fixed-Tuned W-Band Waveguide SIS Mixer with 4.0-7.5 GHz IF
Source: International Journal of Infrared and Millimeter Waves, Volume 24, Number 7, July 2003 , pp. 1091-1099(9)
The design and performance of a fixed-tuned W-band SIS mixer with a wide band IF of 4.0-7.5 GHz is presented. Waveguide-to-stripline transition of the SIS mixer is designed using the lumped-gap-source port provided by HFSSTM. Measured receiver noise temperature is less than 25 K in the frequency range of 95-120 GHz, with a minimum value of around 19 K achieved. Mixer noise temperature is determined to be about 8.5 K, which is around twice the quantum limit (i.e., 2hw/k). In spite of the high IF frequencies (f0 = 6 GHz), the performance of the SIS receiver is comparable or even superior to those of the best mechanically-tunable waveguide SIS receivers at low IF frequencies (f0 = 1.5 GHz). This result suggests that it is easy to design waveguide-to-stripline transitions without scale-model measurements.
Document Type: Research Article
Affiliations: 1: Department of Earth and Life Sciences, College of Integrated Arts and Sciences, Osaka Prefecture University, 1-1 Gakuen-Cho, Sakai-City, Osaka, 599-8531 Japan. Nobeyama Radio Observatory, 462-2 Nobeyama, Nagano, 384-1305 Japan. E-mail: asayama@de 2: Nobeyama Radio Observatory 462-2 Nobeyama, Nagano, 384-1305 Japan 3: Department of Earth and Life Sciences, College of Integrated Arts and Sciences, Osaka Prefecture University, 1-1 Gakuen-Cho, Sakai-City, Osaka, 599-8531 Japan
Publication date: July 1, 2003