Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Pat Niranjanan"'
Publikováno v:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cc9cddca6ec760f56771bf1e62c63f55
https://doi.org/10.1117/12.2629137
https://doi.org/10.1117/12.2629137
Publikováno v:
2018 18th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM).
Cryogenic low noise amplifiers (LNAs) are in high demand for highly sensitive receivers for radio astronomy. This paper describes the design and testing of an extremely low noise amplifier based on 3-stage GaAs HEMTs and a microwave integrated circui
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c48b96394f6306467f94a2ebc8cdcaf7
https://doi.org/10.1109/antem.2018.8572988
https://doi.org/10.1109/antem.2018.8572988
Autor:
Dominic Garcia, Nianhua Jiang, Jens Bornemann, Pat Niranjanan, Lewis B. G. Knee, Alireza Seyfollahi
Publikováno v:
2018 18th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM).
This paper presents the design of a wideband monolithic microwave integrated circuit (MMIC) low noise amplifier (LNA) using GaAs pseudomorphic high electron mobility transistor (pHEMT) technology. The flat gain of 30 dB ±0.5 dB is achieved using a t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::263132e586f8673af2153ff9664b9db2
https://doi.org/10.1109/antem.2018.8572912
https://doi.org/10.1109/antem.2018.8572912
Publikováno v:
2018 18th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM).
We present measured reflectivity of mirrors made of carbon fibre composite materials across Q-Band (33–50 GHz) and W-Band (75–115 GHz). High reflectivity is demonstrated and indicates that these composite reflectors are suitable for lownoise radi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e2f7fd242b22dc09abef2e3304242741
https://doi.org/10.1109/antem.2018.8573009
https://doi.org/10.1109/antem.2018.8573009
Publikováno v:
2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS).
The ALMA telescope has now entered cycle 4 operations [1] and as part of a research study proposal [2], we are exploring possible improvements to the ALMA Band 3 receiver cartridge. The Band 3 receiver is capable of detecting both linear polarisation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a4319b32a5aa5cef5afa49daf09a2d47
https://doi.org/10.23919/ursigass.2017.8105062
https://doi.org/10.23919/ursigass.2017.8105062
Autor:
Dominic Garcia, Haoling Ma, Mark Halman, Frank Jiang, Ivan Wevers, Keith Yeung, D. Duncan, Pat Niranjanan, Stephane Claude
Publikováno v:
Journal of Infrared, Millimeter, and Terahertz Waves. 35:563-582
This paper presents the performance of production Band 3 receivers (84-116 GHz) for the Atacama Large Millimeter Array (ALMA) that operate in Chile at 5000 m altitude. The fabrication, and testing of a total of 73 receivers necessitated stringent qua
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ed0d9bee845ede20625656bfd6385cfb
https://doi.org/10.1007/s10762-014-0071-2
https://doi.org/10.1007/s10762-014-0071-2
Publikováno v:
2016 Global Symposium on Millimeter Waves (GSMM) & ESA Workshop on Millimetre-Wave Technology and Applications.
There is considerable interest in the development of composite materials used for reflectors within radio telescopes. To determine the surface reflectivity of composites at millimetre-wave frequencies, a measurement setup using a Fabry-Perot resonato
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b2450c76a2c0ea7ce2e699aec3a9fab8
https://doi.org/10.1109/gsmm.2016.7500310
https://doi.org/10.1109/gsmm.2016.7500310
This paper demonstrates two designs of extremely low noise amplifiers in the low frequency range of 350 MHz to 1070 MHz. Hybrid microwave integrated circuit is adapted for a low noise design at this low frequency range. Discrete passive components wi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ca6c053d5e33b44871bf4f6dee02e4e5
https://doi.org/10.1117/12.2232154
https://doi.org/10.1117/12.2232154
Autor:
Jens Bornemann, Lisa Locke, Stephane Claude, Pat Niranjanan, Frank Jiang, Ivan Wevers, Doug Henke, Dominic Garcia, James Di Francesco
Publikováno v:
SPIE Proceedings.
Astronomical surveys are demanding more throughput from telescope receivers. Currently, microwave/millimeter telescopes with mature cryogenic single pixel receivers are upgrading to multi-pixel receivers by replacing the conventional feed horns with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::68c027765a69575729ec2dc6295dda06
https://doi.org/10.1117/12.2057146
https://doi.org/10.1117/12.2057146
Autor:
Stephane Claude, P. Dindo, N. Horner, Pat Niranjanan, Keith Yeung, J. E. Effland, Frank Jiang, G. A. Ediss, D. Schmitt
Publikováno v:
2013 IEEE MTT-S International Microwave Symposium Digest (MTT).
Receivers for the Atacama Large Millimeter/submillimeter Array are designed to include 10 frequency bands, and results are presented here for the Band 3 (84-116 GHz) and Band 6 (211-275 GHz) cryogenically cooled dual-polarization, signal-sideband rec
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::344697e64cf64993ee01b97e946a3240
https://doi.org/10.1109/mwsym.2013.6697565
https://doi.org/10.1109/mwsym.2013.6697565