Low noise completely quasioptical SIS receiver for radioastronomy at 115 GHZ
Abstract
Completely quasioptical heterodyne SIS receiver for radioastronomical applications at 115 GHz was designed and tested. Gaussian beam two lens input guide system and open structure SIS mixer with immersion lens were used. Integrated quasioptical structure consists of planar equiangular spiral antenna and superconductor—insulator—superconductor (SIS) tunnel junction as a mixing element connected to the antenna via microstrip impedance transformer. The best SIS mixer noise temperature at hot input and for heterodyne frequency 109.8 GHz with IF central frequency 1.4 GHz (DSB) was 28±7 K at the first quasiparticle step and 8±6 K at the second step.
- Publication:
-
International Journal of Infrared and Millimeter Waves
- Pub Date:
- April 1992
- DOI:
- 10.1007/BF01010700
- Bibcode:
- 1992IJIMW..13..389B
- Keywords:
-
- Low Noise;
- Mixing Circuits;
- Radio Astronomy;
- Radio Receivers;
- Sis (Superconductors);
- Spiral Antennas;
- Heterodyning;
- Impedance Matching;
- Lenses;
- Microstrip Devices;
- Noise Temperature;
- Very High Frequencies;
- Electronics and Electrical Engineering