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Ultrawideband Conic...
Ultrawideband Conical Log-Spiral Circularly Polarized Feed for Radio Astronomy
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- Atia Abdalmalak, Kerlos (author)
- Aswan University,Universidad Carlos Iii De Madrid
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- Santamaría Botello, Gabriel (author)
- Universidad Carlos Iii De Madrid
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- Llorente-Romano, Sergio (author)
- Universidad Carlos Iii De Madrid
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- Rivera-Lavado, Alejandro (author)
- Observatorio de Yebes (IGN),Yebes Observatory,Universidad Carlos Iii De Madrid
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- Flygare, Jonas, 1988 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- López Fernández, José Antonio (author)
- Observatorio de Yebes (IGN),Yebes Observatory
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- Serna Puente, José Manuel (author)
- Observatorio de Yebes (IGN),Yebes Observatory
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- García-Castillo, Luis Emilio (author)
- Universidad Carlos Iii De Madrid
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- Segovia-Vargas, Daniel (author)
- Universidad Carlos Iii De Madrid
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- Pantaleev, Miroslav, 1970 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- García-Muñoz, Luis Enrique (author)
- Universidad Carlos Iii De Madrid
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(creator_code:org_t)
- 2020
- 2020
- English.
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In: IEEE Transactions on Antennas and Propagation. - 0018-926X .- 1558-2221. ; 68:3, s. 1995-2007
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Abstract
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- 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.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
Keyword
- 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
Publication and Content Type
- art (subject category)
- ref (subject category)
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Atia Abdalmalak, ...
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Santamaría Botel ...
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Llorente-Romano, ...
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Rivera-Lavado, A ...
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Flygare, Jonas, ...
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López Fernández, ...
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Serna Puente, Jo ...
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García-Castillo, ...
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Segovia-Vargas, ...
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Pantaleev, Miros ...
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García-Muñoz, Lu ...
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Electrical Engin ...
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IEEE Transaction ...
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Chalmers University of Technology