Very low-noise differential radiometer at 30 GHz for the PLANCK LFI

Aja, B.; Artal, E.; Fuente, Luisa de la; Pascual, Juan Pablo; Mediavilla, A.; Roddis, N.; Kettle, D.; Winder, W.F.; Cara, L.Pi.; Paco, Pedro de

doi:10.1109/tmtt.2005.848815

Cited by 38 publications

(31 citation statements)

References 20 publications

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“…Each bow-tie antenna of this array is ten times smaller compared with the single one, and all of them are aligned to form a compact design, whose impedance of 50 Ohm provides a good match to microstrip transmission lines turning it suitable for integration with MMIC at these frequencies. Our mail goal is to achieve optimal structures that can be integrated with MMIC and included in low frequency coherent detection systems [1] compatibles with the 30 GHz QUIJOTE-CMB Instrument.…”

Section: Outlook Towards the 30 Ghz Quijote-cmb Instrumentmentioning

confidence: 99%

An array of lens-coupled antennas for cosmic microwave background measurements in the 30 Ghz band

et al. 2011

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An array of bow-tie slot antennas coupled through an extended hemispherical lens is proposed to operate in the 30 GHz frequency band. The design includes a combination of three microstrip Wilkinson power dividers (WPD) and transitions to coplanar wave guides (CPW) to form the feeding antenna network. This configuration is suitable for the integration with heterodyne imaging detectors commonly used in radioastronomy. Measurements and simulation results exhibit a frequency range of operation from 20 to 40 GHz with a bandwidth of 24% achieved for −10 dB return loss at the central frequency. The measured radiation patterns show a maximum peak gain of around 13 dB with HPBW of 10 • for the E-plane, and whose first side lobes are lower than 13 dB below the main lobe in both angular shift sides. The presented results will be considered as preliminary feasibility studies in the 30 GHz QUIJOTE-CMB Instrument, which is designed to study the anisotropies of the Cosmic Microwave Background (CMB).

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Section: Outlook Towards the 30 Ghz Quijote-cmb Instrumentmentioning

confidence: 99%

An array of lens-coupled antennas for cosmic microwave background measurements in the 30 Ghz band

et al. 2011

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“…The low-frequency instrument for PLANCK is a radiometer with channels at 30, 44, and 70 GHz. Due to the use of ultra-low-noise MMIC lownoise amplifiers (LNAs) based on cryogenic InP high-electron mobility transistors, very low sensitivities were achieved in differential receivers at 30 GHz [20]. The integration of several MMIC components in multichip modules (MCMs) significantly decreased the volume of the radiometer.…”

Section: Planck Missionmentioning

confidence: 99%

A Miniaturized Spectrometer Radiometer Based on MMIC Technology for Tropospheric Water Vapor Profiling

Iturbide-Sanchez

Reising

Padmanabhan

2007

IEEE Trans. Geosci. Remote Sensing

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Abstract-The fabrication of a miniaturized ground-based water vapor profiling radiometer demonstrates the capability of monolithic microwave and millimeter-wave integrated circuit technology to reduce the mass and volume of microwave remote sensing instrumentation and to reduce substantially the necessary operational power consumption and size of the radiofrequency and intermediate-frequency sections. Since those sections comprise much of the mass and volume of current microwave receivers, the fabrication of this system represents an important contribution to the design of microwave radiometers. This miniaturized radiometer implementation is particularly well suited to benefit from the cost savings associated with mass production. The small size of the radiometer (24 × 18 × 16 cm) reduces the power required by the temperature control system and allows a rapid warm-up to the temperature set point as well as maintenance of a highly stable internal temperature. Exhibiting very similar statistical properties, the four channels of the radiometer have measured Allan times of greater than 40 s. Measurement results demonstrate that the instrument achieves a sensitivity of better than 0.2 K for 3 s of integration time. Preliminary comparisons of measured brightness temperatures with simulation results based on radiosonde data show good agreement, which are consistent with previously reported results.Index Terms-Atmospheric measurements, humidity measurement, microwave radiometry, monolithic microwave and millimeter-wave integrated circuits (MMICs), multichip modules (MCMs), remote sensing.

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“…The CMB is the thermal radiation left over from the time of recombination after Big Bang that was hypothesized by Gamow, Alpher, and Herman in the late 1940s 1 and later accidentally discovered by American radio astronomers, Penzias and Wilson in 1964. 2 Since then, some ground-based experiments [3][4][5][6][7] and space missions [8][9][10][11] have been dedicated to the analysis of temperature and polarization anisotropies of the CMB at different frequency ranges. There is also some future experiments [12][13][14] trying to improve the sensitivity reached by actual experiments with the aim of measuring the B-mode polarization pattern predicted by inflationary models of the early Universe.…”

Section: Introductionmentioning

confidence: 99%

Electro-optic correlator for large-format microwave interferometry: Up-conversion and correlation stages performance analysis

Ortiz

Casas

Ruiz-Lombera³

et al. 2017

Review of Scientific Instruments

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In this paper, a microwave interferometer prototype with a near-infra-red optical correlator is proposed as a solution to get a large-format interferometer with hundreds of receivers for radio astronomy applications. A 10 Gbits/s Lithium Niobate modulator has been tested as part of an electro-optic correlator up-conversion stage that will be integrated in the interferometer prototype. Its internal circuitry consists of a single-drive modulator biased by a SubMiniature version A (SMA) connector allowing to up-convert microwave signals with bandwidths up to 12.5 GHz to the near infrared band. In order to characterize it, a 12 GHz tone and a bias voltage were applied to the SMA input using a polarization tee. Two different experimental techniques to stabilize the modulator operation point in its minimum optical carrier output power are described. The best achieved results showed a rather stable spectrum in amplitude and wavelength at the output of the modulator with an optical carrier level 23 dB lower than the signal of interest. On the other hand, preliminary measurements were made to analyze the correlation stage, using 4f and 6f optical configurations to characterize both the antenna/fiber array configuration and the corresponding point spread function.

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Very low-noise differential radiometer at 30 GHz for the PLANCK LFI

Cited by 38 publications

References 20 publications

An array of lens-coupled antennas for cosmic microwave background measurements in the 30 Ghz band

An array of lens-coupled antennas for cosmic microwave background measurements in the 30 Ghz band

A Miniaturized Spectrometer Radiometer Based on MMIC Technology for Tropospheric Water Vapor Profiling

Electro-optic correlator for large-format microwave interferometry: Up-conversion and correlation stages performance analysis

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