Ultrawideband Conical Log-Spiral Circularly Polarized Feed for Radio Astronomy

Atia Abdalmalak, KerlosAswan University,Universidad Carlos Iii De Madrid (author)

In order to meet the requirements of the new generation of radio telescopes, we have developed a new topology called DYQSA, which stands for DYson Quad-Spiral Array. The design exhibits dual circular polarization contrary to dual linear polarization of state-of-the-art feeds. It covers the required ultrawideband (UWB) from 2 to 14 GHz with an almost constant and real input impedance which facilitates the design of the feeding structure and the low-noise amplifiers (LNAs). Different versions are investigated for enhancing feed performance, ensuring higher aperture efficiencies and mechanical stability. The simulation results of the reflector loaded by the proposed feed show an aperture efficiency of 65%±5% with a noise antenna temperature around 14 K and a system equivalent flux density (SEFD) of about 1300 Jy, both averaged over the required bandwidth at zenith. Measurements of the single-element and the four-element feeds are presented. Comparisons with other state-of-the-art feeds are shown in terms of total aperture efficiencies, design adaptability to different reflectors, calibration signal injection, and the required number of LNAs per feed, cost, and physical volume.

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering hsv//eng
Circular polarization
Antenna radiation patterns
DYson Quad-Spiral Array (DYQSA)
Dual-polarized antennas
Reflector antenna feeds
Radio telescopes
Very Long Baseline Interferometry (VLBI)
Apertures
ultra wideband (UWB) antennas
3-D printing
Conical antennas
Signal to noise ratio
Radio astronomy
VLBI2010 Global Observing System (VGOS)
Log spiral antennas

Santamaría Botello, GabrielUniversidad Carlos Iii De Madrid (author)
Llorente-Romano, SergioUniversidad Carlos Iii De Madrid (author)
Rivera-Lavado, AlejandroObservatorio de Yebes (IGN),Yebes Observatory,Universidad Carlos Iii De Madrid (author)
Flygare, Jonas,1988Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)flygarej (author)
López Fernández, José AntonioObservatorio de Yebes (IGN),Yebes Observatory (author)
Serna Puente, José ManuelObservatorio de Yebes (IGN),Yebes Observatory (author)
García-Castillo, Luis EmilioUniversidad Carlos Iii De Madrid (author)
Segovia-Vargas, DanielUniversidad Carlos Iii De Madrid (author)
Pantaleev, Miroslav,1970Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)mirpan (author)
García-Muñoz, Luis EnriqueUniversidad Carlos Iii De Madrid (author)
Aswan UniversityUniversidad Carlos Iii De Madrid (creator_code:org_t)

In:IEEE Transactions on Antennas and Propagation68:3, s. 1995-20070018-926X1558-2221

By the author/editor: Atia Abdalmalak, ...; Santamaría Botel ...; Llorente-Romano, ...; Rivera-Lavado, A ...; Flygare, Jonas, ...; López Fernández, ...; show more...; Serna Puente, Jo ...; García-Castillo, ...; Segovia-Vargas, ...; Pantaleev, Miros ...; García-Muñoz, Lu ...; show less...

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