Ultrawideband Conical Log-Spiral Circularly Polarized Feed for Radio Astronomy
Artikel i vetenskaplig tidskrift, 2020

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.

Very Long Baseline Interferometry (VLBI)

Antenna radiation patterns

Reflector antenna feeds

Log spiral antennas

Conical antennas

DYson Quad-Spiral Array (DYQSA)

Dual-polarized antennas

ultra wideband (UWB) antennas

Radio telescopes

Circular polarization

Signal to noise ratio

3-D printing

Apertures

Radio astronomy

VLBI2010 Global Observing System (VGOS)

Författare

Kerlos Atia Abdalmalak

Universidad Carlos III de Madrid

Aswan University

Gabriel Santamaría Botello

Universidad Carlos III de Madrid

Sergio Llorente-Romano

Universidad Carlos III de Madrid

Alejandro Rivera-Lavado

Universidad Carlos III de Madrid

Observatorio de Yebes (IGN)

Jonas Flygare

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium, Elektroniklaboratorium

José Antonio López Fernández

Observatorio de Yebes (IGN)

RUAG Space

José Manuel Serna Puente

RUAG Space

Observatorio de Yebes (IGN)

Luis Emilio García-Castillo

Universidad Carlos III de Madrid

Daniel Segovia-Vargas

Universidad Carlos III de Madrid

Miroslav Pantaleev

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium, Elektroniklaboratorium

Luis Enrique García-Muñoz

Universidad Carlos III de Madrid

IEEE Transactions on Antennas and Propagation

0018-926X (ISSN)

Vol. 68 3 1995-2007 8889508

Infrastruktur

Onsala rymdobservatorium

Ämneskategorier

Elektroteknik och elektronik

DOI

10.1109/TAP.2019.2949700

Mer information

Senast uppdaterat

2020-12-23