TY  - JOUR
AU  - Meledin D.
AU  - Desmaris V.
AU  - Ferm S.-E.
AU  - Fredrixon M.
AU  - Henke D.
AU  - Lapkin I.
AU  - Nyström O.
AU  - Pantaleev M.
AU  - Pavolotsky A.
AU  - Strandberg M.
AU  - Sundin E.
AU  - Belitsky V.
PY  - 2008
DA  - 2008//
TI  - APEX Band T2: A 1.25 – 1.39 THz Waveguide  Balanced HEB Receiver
SP  - 181
EP  - 185
AB  - A waveguide 1.25–1.39 THz Hot Electron Bolometer (HEB) balanced receiver was successfully developed, characterized and installed at the Atacama Pathfinder EXperiment (APEX) telescope. The receiver employs a quadrature balanced scheme using a waveguide 90-degree 3 dB RF hybrid, HEB mixers and a 180-degree IF hybrid. The HEB mixers are based on ultrathin NbN film deposited on crystalline quartz with a MgO buffer layer. Integrated into the multi-channel APEX facility receiver (SHeFI), the results presented here demonstrate exceptional performance; a receiver  noise temperature of 1000 K measured at the telescope at the center of the receiver IF band 2-4 GHz, and at an LO frequency of 1294 GHz. Stability of the receiver is fully in line with the SIS mixer bands of the SHeFI, and gives a spectroscopic Allan time of more than 200 s with a noise bandwidth of 1 MHz.
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=974), last updated on Mon, 06 Jul 2015 17:32:56 -0500
ID  - MeledinD._etal2008
ER  -