| Autor: |
Robert J. Dengler, Peter H. Siegel, P.A. Stimson, H.G. LeDuc, S. R. Cypher |
| Rok vydání: |
1993 |
| Předmět: |
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| Zdroj: |
IEEE Transactions on Microwave Theory and Techniques. 41:609-615 |
| ISSN: |
0018-9480 |
| DOI: |
10.1109/22.231654 |
| Popis: |
A planar, quasi-optical SIS (superconductor-insulator-superconductor) receiver operating at 230 GHz is described. The receiver consists of a 2*5 array of half-wave dipole antennas with niobium-aluminum oxide-niobium SIS junctions on a quartz dielectric-filled parabola. The 1.4-GHz intermediate frequency is coupled from the mixer via coplanar strip transmission lines and 4:1 balun transformers. The receiver is operated at 4.2 K in a liquid helium immersion cryostat. Accurate measurements of the performance of single untuned array receiver elements are reported. A mixer noise temperature of 89 K DSB (double sideband), receiver noise temperature of 156 K DSB and conversion loss of 8 dB into a matched load have been obtained. This mixer noise temperature is approximately a factor of two larger than that of current state of the art waveguide mixers using untuned single junctions a the same frequency. > |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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