ISSTT Proceedings

ISSTT Proceedings

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APEX Band T2: A 1.25 - 1.39 THz Waveguide Balanced HEB Receiver

Authors:
D. Meledin, V. Desmaris, S.-E. Ferm, M. Fredrixon, D. Henke, I. Lapkin, O. Nyström, M. Pantaleev, A. Pavolotsky, M. Strandberg, E. Sundin, V. Belitsky
Abstract:
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.
Categories:
Backends, Receivers
Year:
2008
Session:
6
Full-text:
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Page Number(s):
181-185