Low-noise microwave receiving systems in a worldwide network of large antennas

Reid, M. S.; Clauss, R. C.; Bathker, D. A.; Stelzried, C. T.

doi:10.1109/proc.1973.9271

Cited by 24 publications

(3 citation statements)

References 12 publications

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“…The active components are usually transistor amplifiers or, for millimeter wavelengths, SIS (superconductor-insulatorsuperconductor) mixers followed by transistor amplifiers. For descriptions, see, for example, Reid et al (1973), Weinreb et al (1977a), Weinreb et al (1982), Casse et al (1982), Phillips and Woody (1982), Tiuri and Räisänen (1986), Payne (1989), Phillips (1994), Payne et al (1994), Webber and Pospieszalski (2002), and Pospieszalski (2005).…”

Section: Low-noise Input Stagesmentioning

confidence: 99%

System Design

Thompson¹,

Moran²,

Swenson³

2017

Astronomy and Astrophysics Library

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Section: Low-noise Input Stagesmentioning

confidence: 99%

System Design

Thompson¹,

Moran²,

Swenson³

2017

Astronomy and Astrophysics Library

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“…This is a classical Cassegranian system with an antenna efficiency of 63 percent and system noise temperature of 22.5 Kelvins (at 300 elevation angle) at 2.3 GHz [3]. The extremely low system noise temperature was made possible from the utilization of a maser preamplifier (noise temperature 4K).…”

Section: State-of-the-art Large Reflector Antenna Performance Charactmentioning

confidence: 99%

Improved Designs of High Gain Low Noise Dual Reflector Antennas

Cha

1981

11th European Microwave Conference, 1981

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“…The maser, the microwave analogue of the laser, has long been a device of considerable interest [1,2]. With emission frequencies between 0.3 and 300 GHz, masers have had several significant applications, including precision frequency references for atomic clocks [3][4][5], radio astronomy [6,7], space and long-distance communication [8][9][10][11], radar [12,13], remote sensing [14], ultrasensitive magnetic resonance spectroscopy [15], and medical imaging [14]. However, widespread use of such devices has been limited by low efficiency and complex technical requirements.…”

Section: Introductionmentioning

confidence: 99%

Candidate Materials as Gain Media in Organic, Triplet-Based, Room-Temperature masers Targeting the ISM Bands

Wynsberghe¹,

Turak²

2017

Optoelectronics - Advanced Device Structures

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While lasers have enjoyed greater popularity, masers-which emit coherent radiation in the microwave spectrum-are also of critical importance to a variety of applications. Recently, an organic gain medium has been developed, which allows emission at room temperature without the traditional encumbrances of cryogenic cooling or an externally applied magnetic field, at vastly improved power efficiency. This discovery opens up new avenues for applications that were previously impractical. However, further investigation is still required for frequency tuning of the device, through the selection of alternate gain media beyond the original choice of pentacene-doped p-terphenyl and some linear acenes similar to the pentacene prototype. This chapter outlines some of the essential criteria necessary to achieve masing with an organic semiconductor gain medium, including zero-field splitting (ZFS), triplet sublevel division, and metastable population inversion. Three tables of possible candidate materials are presented based on this roster of criteria, particularly targeting emission in one of the industrial, scientific, and medical (ISM) bands. A selection of preferred guest molecules is recommended for in-situ testing as room-temperature masers gain media candidates.

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Low-noise microwave receiving systems in a worldwide network of large antennas

Cited by 24 publications

References 12 publications

System Design

System Design

Improved Designs of High Gain Low Noise Dual Reflector Antennas

Candidate Materials as Gain Media in Organic, Triplet-Based, Room-Temperature masers Targeting the ISM Bands

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