Physics – Condensed Matter – Superconductivity
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992itas....2..165b&link_type=abstract
IEEE Transactions on Applied Superconductivity (ISSN 1051-8223), vol. 2, no. 3, p. 165-175.
Physics
Condensed Matter
Superconductivity
17
Electron Tunneling, Impedance Matching, Radio Receivers, Radio Telescopes, Sis (Superconductors), Submillimeter Waves, Aluminum Oxides, Broadband, Computer Aided Design, Microwave Antennas, Mixing Circuits, Niobium
Scientific paper
The authors have designed, fabricated, and tested a quasi-optical submillimeter wave receiver with an Nb/AlO(x)/Nb tunnel junction. This design incorporates a hybrid antenna fed by a planar logarithmic spiral structure in order to couple to the radiation field from the telescope. The novel matching circuit requires several layers of photolithographic processing on top of the actual tunneling device. Computer modeling of the device correctly predicted the measured bandwidth and the characteristic frequencies to within 8 percent. A good match has been obtained from 200 to 475 GHz between the antenna and a relatively large area (1 sq mm) tunnel junction with omega(R(n))C about 2-4. Noise measurements at 318 GHz, 395 GHz, 426 GHz, and 492 GHz yielded uncorrected double sideband receiver noise temperatures of 200 K, 230 K, 220 K, and 500 K, respectively. Using the same optics, coupling efficiencies between the receiver and the Caltech Submillimeter Telescope were found to have values approaching those achieved by the best waveguide-horn-based receiver systems.
Buttgenbach Thomas H.
Leduc Henry G.
Maker Paul D.
Phillips Thomas G.
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