Low-noise 460 GHz waveguide Schottky mixer radiometer for radioastronomy

Keen, N.J.; Mischerikow, K.-D.; Ediss, G.A.; Perchtold, E.

doi:10.1049/el:19860240

Cited by 14 publications

(3 citation statements)

References 3 publications

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“…System sensitivity, as defined by the noise equivalent delta temperature ( NE δT ) (Hersman & Poe 1981 ) depends on various parameters (equation 1 ) such as the system noise temperature ( T sys ), the spectral resolution (B), the integration time ( τ ), the calibration procedure ( τ c ), and the gain variation ( G / G ). Use of cooled Schottky (Zimmerman, Zimmerman & Zimmerman 1991 ;Siegel et al 1998 ) or superconducting mixers (Keen et al 1986 ) would provide enhanced NE δT but at the expense of a greater system comple xity. This impro v ement is an intended future instrument enhancement…”

Section: Radiometermentioning

confidence: 99%

TeraHertz desorption emission spectroscopy (THz DES) of space relevant ices

Auriacombe

Rea

Ioppolo³

et al. 2022

Monthly Notices of the Royal Astronomical Society

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We present an experimental instrument that performs laboratory-based gas-phase Terahertz Desorption Emission Spectroscopy (THz-DES) experiments in support of astrochemistry. The measurement system combines a terahertz heterodyne radiometer that uses room temperature semiconductor mixer diode technology previously developed for the purposes of Earth observation, with a high-vacuum desorption gas cell and high-speed digital sampling circuitry to enable high spectral and temporal resolution spectroscopy of molecular species with thermal discrimination. During use, molecules are condensed on to a liquid nitrogen cooled metal finger to emulate ice structures that may be present in space. Following deposition, thermal desorption is controlled and initiated by means of a heater and monitored via a temperature sensor. The ‘rest frequency’ spectral signatures of molecules released into the vacuum cell environment are detected by the heterodyne radiometer in real-time and characterised with high spectral resolution. To demonstrate the viability of the instrument, we have studied Nitrous Oxide (N2O). This molecule strongly emits within the terahertz (sub-millimetre wavelength) range and provide a suitable test gas and we compare the results obtained with more traditional techniques such as quadrupole mass spectrometry. The results obtained allow us to fully characterize the measurement method and we discuss its potential use as a laboratory tool in support of astrochemical observations of molecular species in the interstellar medium and the Solar System.

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Section: Radiometermentioning

confidence: 99%

TeraHertz desorption emission spectroscopy (THz DES) of space relevant ices

Auriacombe

Rea

Ioppolo³

et al. 2022

Monthly Notices of the Royal Astronomical Society

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“…However, advances in solid state technology including active amplifiers and frequency multipliers have essentially eliminated that market. What remained was service as local oscillators in submillimeter wave astronomy, spectroscopy instruments, and as swept probe sources in plasma diagnostics [53][54][55][56][57][58][59][60][61][62][63][64].…”

Section: Backward Wave Oscillators Operation and State Of The Artmentioning

confidence: 99%

Millimeter wave traveling wave tubes for the 21st Century

Paoloni

Gamzina

Letizia

et al. 2020

Journal of Electromagnetic Waves and Applications

106

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“…THz frequencies have long being used for radio astronomy, radiometry and imaging systems with SIS mixer and cooled Schottky diodes [1], [2]. Recently, some groups have demonstrated room-temperature imaging systems using heterodyne systems or direct detection in advanced SiGe and CMOS technology [3], [4].…”

Section: Introductionmentioning

confidence: 99%

A 0.37–0.43 THz wideband quadrupler with 160 μW peak output power in 45 nm CMOS

Golcuk

Fung

Rebeiz

2013

2013 IEEE MTT-S International Microwave Symposium Digest (MTT)

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This paper presents a wideband 45 nm CMOS SOI quadrupler at 370 to > 430 GHz. The balanced multiplier results in a very low third harmonic component, and uses reflectors at the output port to reflect the fundamental and the second harmonic frequency into the quadrupler for improved efficiency. The measured output power is > 100 μW at 370-430 GHz with a peak value of 150-160 μW at 390-415 GHz and a conversion loss of 19-20 dB. To the author's knowledge, this is the first demonstration of a wideband CMOS quadrupler at THz frequencies.

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Low-noise 460 GHz waveguide Schottky mixer radiometer for radioastronomy

Cited by 14 publications

References 3 publications

TeraHertz desorption emission spectroscopy (THz DES) of space relevant ices

TeraHertz desorption emission spectroscopy (THz DES) of space relevant ices

Millimeter wave traveling wave tubes for the 21st Century

A 0.37–0.43 THz wideband quadrupler with 160 μW peak output power in 45 nm CMOS

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Low-noise 460 GHz waveguide Schottky mixer radiometer for radioastronomy

Cited by 14 publications

References 3 publications

TeraHertz desorption emission spectroscopy (THz DES) of space relevant ices

TeraHertz desorption emission spectroscopy (THz DES) of space relevant ices

Millimeter wave traveling wave tubes for the 21st Century

A 0.37&#x2013;0.43 THz wideband quadrupler with 160 &#x03BC;W peak output power in 45 nm CMOS

Contact Info

Product

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About

A 0.37–0.43 THz wideband quadrupler with 160 μW peak output power in 45 nm CMOS