Physics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993itap...41..325j&link_type=abstract
IEEE Transactions on Antennas and Propagation (ISSN 0018-926X), vol. 41, no. 3, p. 325-332.
Physics
Antenna Design, Antenna Feeds, Cassegrain Antennas, Parabolic Reflectors, Radio Telescopes, Antenna Radiation Patterns, Dichroism, Superhigh Frequencies, Ultrahigh Frequencies, Very Long Base Interferometry
Scientific paper
The paper describes a dual-band feed system, operating at S- and X-band, that can be temporarily mounted and used in a classical Cassegrainian-type radio telescope without removing the existing feed systems. The novel feed system, designed to give us high efficiency as possible in both bands, consists of two offset primary-fed parabolic reflectors, one for each frequency band. The X-band reflector, located behind the S-band reflector, radiates through a plane dichroic surface that replaces the central part of the S-band reflector. The feed system is to be used for space geodesy utilizing the very-long-baseline interferometry (VLBI) technique and has been tested and used at a radio telescope in Chile. The paper contains results of both a theoretical design study and measurements.
Jaldehag T. K. R.
Kildal Per-Simon
Ronnang Bernt O.
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