Title :
Heterodyne mixing and direct detecting with a 345 GHz quasi-optical SIS mixer
Author :
Fukazawa, Shusaku ; Noguchi, Takashi ; Yokosawa, Masayoshi
Author_Institution :
Dept. of Phys., Ibaraki Univ., Mito, Japan
Abstract :
To evaluate the performance of a quasi-optical SIS (Superconductor-Insulator-Superconductor) mixer, frequency response and mixer noise temperature have been discussed comparatively. We have found that frequency response and noise temperature were closely related. The mixer whose peak of frequency response is almost at the design frequency, and ratio of frequency response to noise is higher, shows the lower receiver noise temperature at the design frequency. Our mixer is a 345-GHz quasi-optical SIS mixer and demonstrated a 3 dB-bandwidth region of 160 to 360 GHz, ratio of frequency response to noise of 31 at 330 GHz and double sideband mixer noise temperature of 104 K at 332 GHz
Keywords :
frequency response; heterodyne detection; submillimetre wave mixers; superconducting device noise; superconductor-insulator-superconductor mixers; 345 GHz; direct detection; frequency response; heterodyne mixing; noise temperature; quasi-optical SIS mixer; submillimeter wave receiver; superconductor-insulator-superconductor mixer; Frequency response; Lenses; Log periodic antennas; Magnetic field measurement; Observatories; PSNR; Superconducting device noise; Superconducting devices; Temperature; Working environment noise;
Conference_Titel :
Microwave and Millimeter Wave Technology Proceedings, 1998. ICMMT '98. 1998 International Conference on
Conference_Location :
Beijing
Print_ISBN :
0-7803-4308-5
DOI :
10.1109/ICMMT.1998.768379
