Broad-band RF match to a millimeter-wave SIS quasi-particle mixer
Abstract
An integrated superconducting microstrip is shown to be a convenient, flexible, and well-characterized matching element for a super-conductor-insulator-superconductor (SIS) quasi-particle heterodyne mixer. The resonant interaction (Fiske modes) between the Josephson oscillations of a voltage-biased junction and the microstrip provides a convenient method for determining the electrical length of the microstrip line. An open-circuited microstrip stub that reflects a parallel inductance across the junction is used to broaden the bandwidth of the RF match of a 30-40-GHz SIS mixer. Measurements with Pb-alloy junctions in a full-height waveguide mixer with fixed mechanical tuning give an instantaneous bandwidth of 10 to 15 percent with a mixer noise temperature of 10 + or - 2.5 K.
- Publication:
-
IEEE Transactions on Microwave Theory Techniques
- Pub Date:
- December 1985
- DOI:
- Bibcode:
- 1985ITMTT..33.1495R
- Keywords:
-
- Broadband;
- Heterodyning;
- Microstrip Transmission Lines;
- Microwave Circuits;
- Millimeter Waves;
- Mixing Circuits;
- Sis (Superconductors);
- Superconductors;
- Elementary Excitations;
- Frequency Response;
- Josephson Junctions;
- Performance Tests;
- Radio Astronomy;
- Radio Receivers;
- Volt-Ampere Characteristics;
- Electronics and Electrical Engineering