NDLI: Microwaves -- The New Horizons of Radio Astronomy

Content Provider	IEEE Xplore Digital Library
Author	Wielebinski, R.
Copyright Year	1987
Description	Author affiliation: Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-5300 Bonn 1, Federal Republic of Germany (Wielebinski, R.)
Abstract	The development of radio astronomy is closely linked with progress in microwaves. Some of the first applications of new microwave devices were for radio observations of the universe. Radio astronomy which started at metre wavelengths has first moved to centimetre waves, is presently operating at millimetres and is now moving into the submillimetre range. As a result of this vast frequency span many different microwave techniques are used. Antenna construction (surface accuracy) had to keep pace with the desired frequency range. At the shortest wavelengths the development of carbon-fibre technology helped to make efficient antennas. At the highest frequencies (and at the lowest) space projects are under consideration to get away from atmospheric (ionospheric) propagation problems. The receivers in all frequency ranges must have the most sensitive state of art detectors. In the millimetre range Schottky-Barrier (S-B) mixer receivers are only slowly being replaced by the SIS (Superconductor-Insulator-Superconductor) detector. In centimetre and long millimetre waves the availability of FET and HEMT amplifiers has led to a number of multichannel projects. At submillimetre wavelengths, the last unexplored spectral range, new receiver developments are pushing the sensitivity further all the time. The use of microwaves has given us a new understanding of the universe. The opening up of new spectral ranges as a result of the development of microwaves gave us new horizons in radio astronomy.
Starting Page	19
Ending Page	24
File Size	6257467
Page Count	6
File Format	PDF
DOI	10.1109/EUMA.1987.333692
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1987-09-07
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio astronomy Superconducting microwave devices Frequency Antennas and propagation Space technology Detectors Microwave theory and techniques Millimeter wave technology Submillimeter wave technology Atmospheric waves
Content Type	Text
Resource Type	Article

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