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Waveguide-Type SIS Receiver Using All-NbN Technique
Masanori TAKEDA Yoshinori UZAWA Akira KAWAKAMI Zhen WANG
Publication
IEICE TRANSACTIONS on Electronics
Vol.E89-C
No.2
pp.163-169 Publication Date: 2006/02/01 Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.2.163 Print ISSN: 0916-8516 Type of Manuscript: Special Section PAPER (Special Section on Superconducting High-frequency Devices) Category: Keyword: SIS mixer, NbN, submillimeter-wave, waveguide, noise temperature,
Full Text: PDF(749KB)>>
Summary:
This paper describes the first experimental results for a waveguide-type all-NbN superconductor-insulator-superconductor (SIS) heterodyne mixer on an MgO substrate designed to operate over the gap frequency of Nb. The mixer consists of an NbN/MgO/NbN junction, which has a length of one wavelength at 880 GHz as a tuning circuit, an NbN/MgO/NbN microstrip as a λ/4 impedance transformer, and an RF choke filter. The mixer chip was designed using a high-frequency-structure simulator. Its return-loss and embedding-impedance characteristics were examined using a 180-times-scaled mixer model. By optimizing the cutting and polishing processes for the MgO substrate, we were able to fabricate the mixer chip with an accuracy of less than 5 µm. We succeeded in mounting the chip on a mixer block and in estimating the receiver noise temperature. The uncorrected minimum double-sideband receiver noise temperature was 740 K at 824 GHz. A comparison of the receiver noise temperature in a quasi-optical SIS mixer fabricated on the same wafer as the waveguide mixer showed that input noise was the major contributor to receiver noise in the waveguide mixer.
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