Dual-band reflector feed system for classical Cassegrain radio telescopes

Author

Jaldehag, R. T Kenneth ; Kildal, Per-Simon ; Rönnäng, Bernt O.

Author_Institution

Dept. of Radio & Space Sci., Chalmers Univ. of Technol., Onsala, Sweden

Volume

41

Issue

3

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

325

Lastpage

332

Abstract

The authors describe 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 feed system, designed to give as 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. Results of both a theoretical design study and measurements are given

Keywords

antenna feeders; microwave antennas; radiotelescopes; radiowave interferometry; reflector antennas; Cassegrain radio telescopes; S-band; VLBI; X-band; dual-band feed system; offset primary-fed parabolic reflectors; plane dichroic surface; space geodesy; very-long-baseline interferometry; Antenna feeds; Antenna measurements; Dual band; Earth; Frequency; Horn antennas; Level measurement; Radio astronomy; Radio interferometry; Space technology;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.233131

Filename

233131