Compact, cranked-dipole feed for efficient illumination of small F/D paraboloids

Details Compact, cranked-dipole feed for efficient illumination of small F/D paraboloids Compact, cranked-dipole feed for efficient illumination of small F/D paraboloids

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ell....21..768b&link_type=abstract

Electronics Letters (ISSN 0013-5194), vol. 21, Aug. 15, 1985, p. 768, 769.

Computer Science

Antenna Feeds, Antenna Radiation Patterns, Dipole Antennas, Parabolic Antennas, Radio Telescopes, Slot Antennas, Azimuth, Crosstalk

Scientific paper

The present study was inspired by the need for an efficient primary feed for the Mk 1A radio telescope at Jodrell Bank, UK, to operate at 151 MHz. It is shown that the azimuthal symmetry of the polar diagram of a simple dipole radiator above a ground plane may be improved by bending the ends of the dipole toward the ground plane. Combined with capacitive loading of the dipole and a modified balun, this technique produces a compact efficient feed with improved selectivity. It is noted that, although originally conceived for use on the Mk 1A, feeds of this type perform well on three E-system dishes (focal length/diameter = 0.36) which form part of the Merlin interferometer.

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